The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - In kernel/bpf/hashtab.c in the Linux kernel through 5.13.8, there is an integer overflow and out-of-bounds     write when many elements are placed in a single bucket. NOTE: exploitation might be impractical without     the CAP_SYS_ADMIN capability. (CVE-2021-38166)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote Ubuntu 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-5096-1 advisory.

    Valentina Palmiotti discovered that the io_uring subsystem in the Linux kernel could be coerced to free     adjacent memory. A local attacker could use this to execute arbitrary code. (CVE-2021-41073)

    Benedict Schlueter discovered that the BPF subsystem in the Linux kernel did not properly protect against     Speculative Store Bypass (SSB) side- channel attacks in some situations. A local attacker could possibly     use this to expose sensitive information. (CVE-2021-34556)

    Piotr Krysiuk discovered that the BPF subsystem in the Linux kernel did not properly protect against     Speculative Store Bypass (SSB) side-channel attacks in some situations. A local attacker could possibly     use this to expose sensitive information. (CVE-2021-35477)

    Murray McAllister discovered that the joystick device interface in the Linux kernel did not properly     validate data passed via an ioctl(). A local attacker could use this to cause a denial of service (system     crash) or possibly execute arbitrary code on systems with a joystick device registered. (CVE-2021-3612)

    It was discovered that the tracing subsystem in the Linux kernel did not properly keep track of per-cpu     ring buffer state. A privileged attacker could use this to cause a denial of service. (CVE-2021-3679)

    It was discovered that the Option USB High Speed Mobile device driver in the Linux kernel did not properly     handle error conditions. A physically proximate attacker could use this to cause a denial of service     (system crash) or possibly execute arbitrary code. (CVE-2021-37159)

    Alois Wohlschlager discovered that the overlay file system in the Linux kernel did not restrict private     clones in some situations. An attacker could use this to expose sensitive information. (CVE-2021-3732)

    It was discovered that the Virtio console implementation in the Linux kernel did not properly validate     input lengths in some situations. A local attacker could possibly use this to cause a denial of service     (system crash). (CVE-2021-38160)

    It was discovered that the BPF subsystem in the Linux kernel contained an integer overflow in its hash     table implementation. A local attacker could use this to cause a denial of service (system crash) or     possibly execute arbitrary code. (CVE-2021-38166)

    Michael Wakabayashi discovered that the NFSv4 client implementation in the Linux kernel did not properly     order connection setup operations. An attacker controlling a remote NFS server could use this to cause a     denial of service on the client. (CVE-2021-38199)

    It was discovered that the Sun RPC implementation in the Linux kernel contained an out-of-bounds access     error. A remote attacker could possibly use this to cause a denial of service (system crash).
    (CVE-2021-38201)

    It was discovered that the NFS server implementation in the Linux kernel contained an out-of-bounds read     when the trace even framework is being used for nfsd. A remote attacker could possibly use this to cause a     denial of service (system crash). (CVE-2021-38202)

    Naohiro Aota discovered that the btrfs file system in the Linux kernel contained a race condition in     situations that triggered allocations of new system chunks. A local attacker could possibly use this to     cause a denial of service (deadlock). (CVE-2021-38203)

    It was discovered that the MAX-3421 host USB device driver in the Linux kernel did not properly handle     device removal events. A physically proximate attacker could use this to cause a denial of service (system     crash). (CVE-2021-38204)

    It was discovered that the Xilinx 10/100 Ethernet Lite device driver in the Linux kernel could report     pointer addresses in some situations. An attacker could use this information to ease the exploitation of     another vulnerability. (CVE-2021-38205)

    It was discovered that the ext4 file system in the Linux kernel contained a race condition when writing     xattrs to an inode. A local attacker could use this to cause a denial of service or possibly gain     administrative privileges. (CVE-2021-40490)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:3179-1 advisory.

  - An issue was discovered in the Linux kernel through 5.6.11. sg_write lacks an sg_remove_request call in a     certain failure case, aka CID-83c6f2390040. (CVE-2020-12770)

  - In the Linux kernel through 5.13.7, an unprivileged BPF program can obtain sensitive information from     kernel memory via a Speculative Store Bypass side-channel attack because the protection mechanism neglects     the possibility of uninitialized memory locations on the BPF stack. (CVE-2021-34556)

  - In the Linux kernel through 5.13.7, an unprivileged BPF program can obtain sensitive information from     kernel memory via a Speculative Store Bypass side-channel attack because a certain preempting store     operation does not necessarily occur before a store operation that has an attacker-controlled value.
    (CVE-2021-35477)

  - A flaw use-after-free in function sco_sock_sendmsg() of the Linux kernel HCI subsystem was found in the     way user calls ioct UFFDIO_REGISTER or other way triggers race condition of the call sco_conn_del()     together with the call sco_sock_sendmsg() with the expected controllable faulting memory page. A     privileged local user could use this flaw to crash the system or escalate their privileges on the system.
    (CVE-2021-3640)

  - A flaw was found in the KVM's AMD code for supporting SVM nested virtualization. The flaw occurs when     processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested     guest (L2). Due to improper validation of the int_ctl field, this issue could allow a malicious L1 to     enable AVIC support (Advanced Virtual Interrupt Controller) for the L2 guest. As a result, the L2 guest     would be allowed to read/write physical pages of the host, resulting in a crash of the entire system, leak     of sensitive data or potential guest-to-host escape. This flaw affects Linux kernel versions prior to     5.14-rc7. (CVE-2021-3653)

  - A flaw was found in the KVM's AMD code for supporting SVM nested virtualization. The flaw occurs when     processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested     guest (L2). Due to improper validation of the virt_ext field, this issue could allow a malicious L1 to     disable both VMLOAD/VMSAVE intercepts and VLS (Virtual VMLOAD/VMSAVE) for the L2 guest. As a result, the     L2 guest would be allowed to read/write physical pages of the host, resulting in a crash of the entire     system, leak of sensitive data or potential guest-to-host escape. (CVE-2021-3656)

  - A lack of CPU resource in the Linux kernel tracing module functionality in versions prior to 5.14-rc3 was     found in the way user uses trace ring buffer in a specific way. Only privileged local users (with     CAP_SYS_ADMIN capability) could use this flaw to starve the resources causing denial of service.
    (CVE-2021-3679)

  - A flaw was found in the Linux kernel's OverlayFS subsystem in the way the user mounts the TmpFS filesystem     with OverlayFS. This flaw allows a local user to gain access to hidden files that should not be     accessible. (CVE-2021-3732)

  - A NULL pointer dereference flaw was found in the btrfs_rm_device function in fs/btrfs/volumes.c in the     Linux Kernel, where triggering the bug requires CAP_SYS_ADMIN'. This flaw allows a local attacker to     crash the system or leak kernel internal information. The highest threat from this vulnerability is to     system availability. (CVE-2021-3739)

  - An out-of-bounds (OOB) memory read flaw was found in the Qualcomm IPC router protocol in the Linux kernel.
    A missing sanity check allows a local attacker to gain access to out-of-bounds memory, leading to a system     crash or a leak of internal kernel information. The highest threat from this vulnerability is to system     availability. (CVE-2021-3743)

  - A race problem was seen in the vt_k_ioctl in drivers/tty/vt/vt_ioctl.c in the Linux kernel, which may     cause an out of bounds read in vt as the write access to vc_mode is not protected by lock-in vt_ioctl     (KDSETMDE). The highest threat from this vulnerability is to data confidentiality. (CVE-2021-3753)

  - A memory overflow vulnerability was found in the Linux kernel's ipc functionality of the memcg subsystem,     in the way a user calls the semget function multiple times, creating semaphores. This flaw allows a local     user to starve the resources, causing a denial of service. The highest threat from this vulnerability is     to system availability. (CVE-2021-3759)

  - ** DISPUTED ** In drivers/char/virtio_console.c in the Linux kernel before 5.13.4, data corruption or loss     can be triggered by an untrusted device that supplies a buf->len value exceeding the buffer size. NOTE:
    the vendor indicates that the cited data corruption is not a vulnerability in any existing use case; the     length validation was added solely for robustness in the face of anomalous host OS behavior.
    (CVE-2021-38160)

  - In kernel/bpf/hashtab.c in the Linux kernel through 5.13.8, there is an integer overflow and out-of-bounds     write when many elements are placed in a single bucket. NOTE: exploitation might be impractical without     the CAP_SYS_ADMIN capability. (CVE-2021-38166)

  - arch/x86/kvm/mmu/paging_tmpl.h in the Linux kernel before 5.12.11 incorrectly computes the access     permissions of a shadow page, leading to a missing guest protection page fault. (CVE-2021-38198)

  - drivers/usb/host/max3421-hcd.c in the Linux kernel before 5.13.6 allows physically proximate attackers to     cause a denial of service (use-after-free and panic) by removing a MAX-3421 USB device in certain     situations. (CVE-2021-38204)

  - drivers/net/ethernet/xilinx/xilinx_emaclite.c in the Linux kernel before 5.13.3 makes it easier for     attackers to defeat an ASLR protection mechanism because it prints a kernel pointer (i.e., the real IOMEM     pointer). (CVE-2021-38205)

  - The mac80211 subsystem in the Linux kernel before 5.12.13, when a device supporting only 5 GHz is used,     allows attackers to cause a denial of service (NULL pointer dereference in the radiotap parser) by     injecting a frame with 802.11a rates. (CVE-2021-38206)

  - drivers/net/ethernet/xilinx/ll_temac_main.c in the Linux kernel before 5.12.13 allows remote attackers to     cause a denial of service (buffer overflow and lockup) by sending heavy network traffic for about ten     minutes. (CVE-2021-38207)

  - net/netfilter/nf_conntrack_standalone.c in the Linux kernel before 5.12.2 allows observation of changes in     any net namespace because these changes are leaked into all other net namespaces. This is related to the     NF_SYSCTL_CT_MAX, NF_SYSCTL_CT_EXPECT_MAX, and NF_SYSCTL_CT_BUCKETS sysctls. (CVE-2021-38209)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of kernel installed on the remote host is prior to 5.10.62-55.141. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2KERNEL-5.10-2022-005 advisory.

    A flaw was found in the Linux kernel's implementation of wireless drivers using the Atheros chipsets.  An     attacker within wireless range could send crafted traffic leading to information disclosure.
    (CVE-2020-3702)

    A flaw was found in the KVM's AMD code for supporting SVM nested virtualization. The flaw occurs when     processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested     guest (L2). Due to improper validation of the int_ctl field, this issue could allow a malicious L1 to     enable AVIC support (Advanced Virtual Interrupt Controller) for the L2 guest. As a result, the L2 guest     would be allowed to read/write physical pages of the host, resulting in a crash of the entire system, leak     of sensitive data or potential guest-to-host escape. (CVE-2021-3653)

    A flaw was found in the KVM's AMD code for supporting SVM nested virtualization. The flaw occurs when     processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested     guest (L2). Due to improper validation of the virt_ext field, this issue could allow a malicious L1 to     disable both VMLOAD/VMSAVE intercepts and VLS (Virtual VMLOAD/VMSAVE) for the L2 guest. As a result, the     L2 guest would be allowed to read/write physical pages of the host, resulting in a crash of the entire     system, leak of sensitive data or potential guest-to-host escape. (CVE-2021-3656)

    A NULL pointer dereference flaw was found in the btrfs_rm_device function in fs/btrfs/volumes.c in the     Linux Kernel, where triggering the bug requires 'CAP_SYS_ADMIN'. This flaw allows a local attacker to     crash the system or leak kernel internal information. The highest threat from this vulnerability is to     system availability. (CVE-2021-3739)

    A race problem was seen in the vt_k_ioctl in drivers/tty/vt/vt_ioctl.c in the Linux kernel, which may     cause an out of bounds read in vt as the write access to vc_mode is not protected by lock-in vt_ioctl     (KDSETMDE). The highest threat from this vulnerability is to data confidentiality. (CVE-2021-3753)

    A flaw was found in the Linux kernel. An integer overflow can allow an out-of-bounds write when many     elements are placed in a hash's bucket. The highest threat from this vulnerability is to data     confidentiality and integrity as well as system availability. (CVE-2021-38166)

    A flaw was found in the Linux kernel. A race condition was discovered in the ext4 subsystem. The highest     threat from this vulnerability is to data confidentiality and integrity as well as system availability.
    (CVE-2021-40490)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-4978 advisory.

    Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation,     denial of service or information leaks. CVE-2020-3702 A flaw was found in the driver for Atheros IEEE     802.11n family of chipsets (ath9k) allowing information disclosure. CVE-2020-16119 Hadar Manor reported a     use-after-free in the DCCP protocol implementation in the Linux kernel. A local attacker can take     advantage of this flaw to cause a denial of service or potentially to execute arbitrary code.
    CVE-2021-3653 Maxim Levitsky discovered a vulnerability in the KVM hypervisor implementation for AMD     processors in the Linux kernel: Missing validation of the `int_ctl` VMCB field could allow a malicious L1     guest to enable AVIC support (Advanced Virtual Interrupt Controller) for the L2 guest. The L2 guest can     take advantage of this flaw to write to a limited but still relatively large subset of the host physical     memory. CVE-2021-3656 Maxim Levitsky and Paolo Bonzini discovered a flaw in the KVM hypervisor     implementation for AMD processors in the Linux kernel. Missing validation of the `virt_ext` VMCB field     could allow a malicious L1 guest to disable both VMLOAD/VMSAVE intercepts and VLS (Virtual VMLOAD/VMSAVE)     for the L2 guest. Under these circumstances, the L2 guest is able to run VMLOAD/VMSAVE unintercepted and     thus read/write portions of the host's physical memory. CVE-2021-3679 A flaw in the Linux kernel tracing     module functionality could allow a privileged local user (with CAP_SYS_ADMIN capability) to cause a denial     of service (resource starvation). CVE-2021-3732 Alois Wohlschlager reported a flaw in the implementation     of the overlayfs subsystem, allowing a local attacker with privileges to mount a filesystem to reveal     files hidden in the original mount. CVE-2021-3739 A NULL pointer dereference flaw was found in the btrfs     filesystem, allowing a local attacker with CAP_SYS_ADMIN capabilities to cause a denial of service.
    CVE-2021-3743 An out-of-bounds memory read was discovered in the Qualcomm IPC router protocol     implementation, allowing to cause a denial of service or information leak. CVE-2021-3753 Minh Yuan     reported a race condition in the vt_k_ioctl in drivers/tty/vt/vt_ioctl.c, which may cause an out of bounds     read in vt. CVE-2021-37576 Alexey Kardashevskiy reported a buffer overflow in the KVM subsystem on the     powerpc platform, which allows KVM guest OS users to cause memory corruption on the host. CVE-2021-38160 A     flaw in the virtio_console was discovered allowing data corruption or data loss by an untrusted device.
    CVE-2021-38166 An integer overflow flaw in the BPF subsystem could allow a local attacker to cause a     denial of service or potentially the execution of arbitrary code. This flaw is mitigated by default in     Debian as unprivileged calls to bpf() are disabled. CVE-2021-38199 Michael Wakabayashi reported a flaw in     the NFSv4 client implementation, where incorrect connection setup ordering allows operations of a remote     NFSv4 server to cause a denial of service. CVE-2021-40490 A race condition was discovered in the ext4     subsystem when writing to an inline_data file while its xattrs are changing. This could result in denial     of service. CVE-2021-41073 Valentina Palmiotti discovered a flaw in io_uring allowing a local attacker to     escalate privileges. For the stable distribution (bullseye), these problems have been fixed in version     5.10.46-5. This update includes fixes for #993948 and #993978. We recommend that you upgrade your linux     packages. For the detailed security status of linux please refer to its security tracker page at:
    https://security-tracker.debian.org/tracker/linux

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

An update of the linux package has been released.

The remote SUSE Linux SUSE15 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2021:3205-1 advisory.

  - An issue was discovered in the Linux kernel through 5.6.11. sg_write lacks an sg_remove_request call in a     certain failure case, aka CID-83c6f2390040. (CVE-2020-12770)

  - In the Linux kernel through 5.13.7, an unprivileged BPF program can obtain sensitive information from     kernel memory via a Speculative Store Bypass side-channel attack because the protection mechanism neglects     the possibility of uninitialized memory locations on the BPF stack. (CVE-2021-34556)

  - In the Linux kernel through 5.13.7, an unprivileged BPF program can obtain sensitive information from     kernel memory via a Speculative Store Bypass side-channel attack because a certain preempting store     operation does not necessarily occur before a store operation that has an attacker-controlled value.
    (CVE-2021-35477)

  - kernel: SVM nested virtualization issue in KVM (AVIC support) (CVE-2021-3653)

  - A flaw was found in the KVM's AMD code for supporting SVM nested virtualization. The flaw occurs when     processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested     guest (L2). Due to improper validation of the int_ctl field, this issue could allow a malicious L1 to     enable AVIC support (Advanced Virtual Interrupt Controller) for the L2 guest. As a result, the L2 guest     would be allowed to read/write physical pages of the host, resulting in a crash of the entire system, leak     of sensitive data or potential guest-to-host escape. (CVE-2021-3653) (CVE-2021-3656, CVE-2021-3732,     CVE-2021-3753)

  - A lack of CPU resource in the Linux kernel tracing module functionality in versions prior to 5.14-rc3 was     found in the way user uses trace ring buffer in a specific way. Only privileged local users (with     CAP_SYS_ADMIN capability) could use this flaw to starve the resources causing denial of service.
    (CVE-2021-3679)

  - ** DISPUTED ** In drivers/char/virtio_console.c in the Linux kernel before 5.13.4, data corruption or loss     can be triggered by an untrusted device that supplies a buf->len value exceeding the buffer size. NOTE:
    the vendor indicates that the cited data corruption is not a vulnerability in any existing use case; the     length validation was added solely for robustness in the face of anomalous host OS behavior.
    (CVE-2021-38160)

  - In kernel/bpf/hashtab.c in the Linux kernel through 5.13.8, there is an integer overflow and out-of-bounds     write when many elements are placed in a single bucket. NOTE: exploitation might be impractical without     the CAP_SYS_ADMIN capability. (CVE-2021-38166)

  - arch/x86/kvm/mmu/paging_tmpl.h in the Linux kernel before 5.12.11 incorrectly computes the access     permissions of a shadow page, leading to a missing guest protection page fault. (CVE-2021-38198)

  - drivers/usb/host/max3421-hcd.c in the Linux kernel before 5.13.6 allows physically proximate attackers to     cause a denial of service (use-after-free and panic) by removing a MAX-3421 USB device in certain     situations. (CVE-2021-38204)

  - drivers/net/ethernet/xilinx/xilinx_emaclite.c in the Linux kernel before 5.13.3 makes it easier for     attackers to defeat an ASLR protection mechanism because it prints a kernel pointer (i.e., the real IOMEM     pointer). (CVE-2021-38205)

  - The mac80211 subsystem in the Linux kernel before 5.12.13, when a device supporting only 5 GHz is used,     allows attackers to cause a denial of service (NULL pointer dereference in the radiotap parser) by     injecting a frame with 802.11a rates. (CVE-2021-38206)

  - drivers/net/ethernet/xilinx/ll_temac_main.c in the Linux kernel before 5.12.13 allows remote attackers to     cause a denial of service (buffer overflow and lockup) by sending heavy network traffic for about ten     minutes. (CVE-2021-38207)

  - net/netfilter/nf_conntrack_standalone.c in the Linux kernel before 5.12.2 allows observation of changes in     any net namespace because these changes are leaked into all other net namespaces. This is related to the     NF_SYSCTL_CT_MAX, NF_SYSCTL_CT_EXPECT_MAX, and NF_SYSCTL_CT_BUCKETS sysctls. (CVE-2021-38209)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Ubuntu 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-5113-1 advisory.

    It was discovered that a race condition existed in the Atheros Ath9k WiFi driver in the Linux kernel. An     attacker could possibly use this to expose sensitive information (WiFi network traffic). (CVE-2020-3702)

    Alois Wohlschlager discovered that the overlay file system in the Linux kernel did not restrict private     clones in some situations. An attacker could use this to expose sensitive information. (CVE-2021-3732)

    It was discovered that the btrfs file system in the Linux kernel did not properly handle removing a non-     existent device id. An attacker with CAP_SYS_ADMIN could use this to cause a denial of service.
    (CVE-2021-3739)

    It was discovered that the Qualcomm IPC Router protocol implementation in the Linux kernel did not     properly validate metadata in some situations. A local attacker could use this to cause a denial of     service (system crash) or expose sensitive information. (CVE-2021-3743)

    It was discovered that the virtual terminal (vt) device implementation in the Linux kernel contained a     race condition in its ioctl handling that led to an out-of-bounds read vulnerability. A local attacker     could possibly use this to expose sensitive information. (CVE-2021-3753)

    It was discovered that the BPF subsystem in the Linux kernel contained an integer overflow in its hash     table implementation. A local attacker could use this to cause a denial of service (system crash) or     possibly execute arbitrary code. (CVE-2021-38166)

    It was discovered that the ext4 file system in the Linux kernel contained a race condition when writing     xattrs to an inode. A local attacker could use this to cause a denial of service or possibly gain     administrative privileges. (CVE-2021-40490)

    It was discovered that the 6pack network protocol driver in the Linux kernel did not properly perform     validation checks. A privileged attacker could use this to cause a denial of service (system crash) or     execute arbitrary code. (CVE-2021-42008)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SUSE15 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2021:3179-1 advisory.

  - An issue was discovered in the Linux kernel through 5.6.11. sg_write lacks an sg_remove_request call in a     certain failure case, aka CID-83c6f2390040. (CVE-2020-12770)

  - In the Linux kernel through 5.13.7, an unprivileged BPF program can obtain sensitive information from     kernel memory via a Speculative Store Bypass side-channel attack because the protection mechanism neglects     the possibility of uninitialized memory locations on the BPF stack. (CVE-2021-34556)

  - In the Linux kernel through 5.13.7, an unprivileged BPF program can obtain sensitive information from     kernel memory via a Speculative Store Bypass side-channel attack because a certain preempting store     operation does not necessarily occur before a store operation that has an attacker-controlled value.
    (CVE-2021-35477)

  - kernel: SVM nested virtualization issue in KVM (AVIC support) (CVE-2021-3653)

  - A flaw was found in the KVM's AMD code for supporting SVM nested virtualization. The flaw occurs when     processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested     guest (L2). Due to improper validation of the int_ctl field, this issue could allow a malicious L1 to     enable AVIC support (Advanced Virtual Interrupt Controller) for the L2 guest. As a result, the L2 guest     would be allowed to read/write physical pages of the host, resulting in a crash of the entire system, leak     of sensitive data or potential guest-to-host escape. (CVE-2021-3653) (CVE-2021-3656, CVE-2021-3732,     CVE-2021-3753)

  - A lack of CPU resource in the Linux kernel tracing module functionality in versions prior to 5.14-rc3 was     found in the way user uses trace ring buffer in a specific way. Only privileged local users (with     CAP_SYS_ADMIN capability) could use this flaw to starve the resources causing denial of service.
    (CVE-2021-3679)

  - ** DISPUTED ** In drivers/char/virtio_console.c in the Linux kernel before 5.13.4, data corruption or loss     can be triggered by an untrusted device that supplies a buf->len value exceeding the buffer size. NOTE:
    the vendor indicates that the cited data corruption is not a vulnerability in any existing use case; the     length validation was added solely for robustness in the face of anomalous host OS behavior.
    (CVE-2021-38160)

  - In kernel/bpf/hashtab.c in the Linux kernel through 5.13.8, there is an integer overflow and out-of-bounds     write when many elements are placed in a single bucket. NOTE: exploitation might be impractical without     the CAP_SYS_ADMIN capability. (CVE-2021-38166)

  - arch/x86/kvm/mmu/paging_tmpl.h in the Linux kernel before 5.12.11 incorrectly computes the access     permissions of a shadow page, leading to a missing guest protection page fault. (CVE-2021-38198)

  - drivers/usb/host/max3421-hcd.c in the Linux kernel before 5.13.6 allows physically proximate attackers to     cause a denial of service (use-after-free and panic) by removing a MAX-3421 USB device in certain     situations. (CVE-2021-38204)

  - drivers/net/ethernet/xilinx/xilinx_emaclite.c in the Linux kernel before 5.13.3 makes it easier for     attackers to defeat an ASLR protection mechanism because it prints a kernel pointer (i.e., the real IOMEM     pointer). (CVE-2021-38205)

  - The mac80211 subsystem in the Linux kernel before 5.12.13, when a device supporting only 5 GHz is used,     allows attackers to cause a denial of service (NULL pointer dereference in the radiotap parser) by     injecting a frame with 802.11a rates. (CVE-2021-38206)

  - drivers/net/ethernet/xilinx/ll_temac_main.c in the Linux kernel before 5.12.13 allows remote attackers to     cause a denial of service (buffer overflow and lockup) by sending heavy network traffic for about ten     minutes. (CVE-2021-38207)

  - net/netfilter/nf_conntrack_standalone.c in the Linux kernel before 5.12.2 allows observation of changes in     any net namespace because these changes are leaked into all other net namespaces. This is related to the     NF_SYSCTL_CT_MAX, NF_SYSCTL_CT_EXPECT_MAX, and NF_SYSCTL_CT_BUCKETS sysctls. (CVE-2021-38209)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLES15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:3205-1 advisory.

  - An issue was discovered in the Linux kernel through 5.6.11. sg_write lacks an sg_remove_request call in a     certain failure case, aka CID-83c6f2390040. (CVE-2020-12770)

  - In the Linux kernel through 5.13.7, an unprivileged BPF program can obtain sensitive information from     kernel memory via a Speculative Store Bypass side-channel attack because the protection mechanism neglects     the possibility of uninitialized memory locations on the BPF stack. (CVE-2021-34556)

  - In the Linux kernel through 5.13.7, an unprivileged BPF program can obtain sensitive information from     kernel memory via a Speculative Store Bypass side-channel attack because a certain preempting store     operation does not necessarily occur before a store operation that has an attacker-controlled value.
    (CVE-2021-35477)

  - A flaw use-after-free in function sco_sock_sendmsg() of the Linux kernel HCI subsystem was found in the     way user calls ioct UFFDIO_REGISTER or other way triggers race condition of the call sco_conn_del()     together with the call sco_sock_sendmsg() with the expected controllable faulting memory page. A     privileged local user could use this flaw to crash the system or escalate their privileges on the system.
    (CVE-2021-3640)

  - A flaw was found in the KVM's AMD code for supporting SVM nested virtualization. The flaw occurs when     processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested     guest (L2). Due to improper validation of the int_ctl field, this issue could allow a malicious L1 to     enable AVIC support (Advanced Virtual Interrupt Controller) for the L2 guest. As a result, the L2 guest     would be allowed to read/write physical pages of the host, resulting in a crash of the entire system, leak     of sensitive data or potential guest-to-host escape. This flaw affects Linux kernel versions prior to     5.14-rc7. (CVE-2021-3653)

  - A flaw was found in the KVM's AMD code for supporting SVM nested virtualization. The flaw occurs when     processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested     guest (L2). Due to improper validation of the virt_ext field, this issue could allow a malicious L1 to     disable both VMLOAD/VMSAVE intercepts and VLS (Virtual VMLOAD/VMSAVE) for the L2 guest. As a result, the     L2 guest would be allowed to read/write physical pages of the host, resulting in a crash of the entire     system, leak of sensitive data or potential guest-to-host escape. (CVE-2021-3656)

  - A lack of CPU resource in the Linux kernel tracing module functionality in versions prior to 5.14-rc3 was     found in the way user uses trace ring buffer in a specific way. Only privileged local users (with     CAP_SYS_ADMIN capability) could use this flaw to starve the resources causing denial of service.
    (CVE-2021-3679)

  - A flaw was found in the Linux kernel's OverlayFS subsystem in the way the user mounts the TmpFS filesystem     with OverlayFS. This flaw allows a local user to gain access to hidden files that should not be     accessible. (CVE-2021-3732)

  - A NULL pointer dereference flaw was found in the btrfs_rm_device function in fs/btrfs/volumes.c in the     Linux Kernel, where triggering the bug requires CAP_SYS_ADMIN'. This flaw allows a local attacker to     crash the system or leak kernel internal information. The highest threat from this vulnerability is to     system availability. (CVE-2021-3739)

  - An out-of-bounds (OOB) memory read flaw was found in the Qualcomm IPC router protocol in the Linux kernel.
    A missing sanity check allows a local attacker to gain access to out-of-bounds memory, leading to a system     crash or a leak of internal kernel information. The highest threat from this vulnerability is to system     availability. (CVE-2021-3743)

  - A race problem was seen in the vt_k_ioctl in drivers/tty/vt/vt_ioctl.c in the Linux kernel, which may     cause an out of bounds read in vt as the write access to vc_mode is not protected by lock-in vt_ioctl     (KDSETMDE). The highest threat from this vulnerability is to data confidentiality. (CVE-2021-3753)

  - A memory overflow vulnerability was found in the Linux kernel's ipc functionality of the memcg subsystem,     in the way a user calls the semget function multiple times, creating semaphores. This flaw allows a local     user to starve the resources, causing a denial of service. The highest threat from this vulnerability is     to system availability. (CVE-2021-3759)

  - ** DISPUTED ** In drivers/char/virtio_console.c in the Linux kernel before 5.13.4, data corruption or loss     can be triggered by an untrusted device that supplies a buf->len value exceeding the buffer size. NOTE:
    the vendor indicates that the cited data corruption is not a vulnerability in any existing use case; the     length validation was added solely for robustness in the face of anomalous host OS behavior.
    (CVE-2021-38160)

  - In kernel/bpf/hashtab.c in the Linux kernel through 5.13.8, there is an integer overflow and out-of-bounds     write when many elements are placed in a single bucket. NOTE: exploitation might be impractical without     the CAP_SYS_ADMIN capability. (CVE-2021-38166)

  - arch/x86/kvm/mmu/paging_tmpl.h in the Linux kernel before 5.12.11 incorrectly computes the access     permissions of a shadow page, leading to a missing guest protection page fault. (CVE-2021-38198)

  - drivers/usb/host/max3421-hcd.c in the Linux kernel before 5.13.6 allows physically proximate attackers to     cause a denial of service (use-after-free and panic) by removing a MAX-3421 USB device in certain     situations. (CVE-2021-38204)

  - drivers/net/ethernet/xilinx/xilinx_emaclite.c in the Linux kernel before 5.13.3 makes it easier for     attackers to defeat an ASLR protection mechanism because it prints a kernel pointer (i.e., the real IOMEM     pointer). (CVE-2021-38205)

  - The mac80211 subsystem in the Linux kernel before 5.12.13, when a device supporting only 5 GHz is used,     allows attackers to cause a denial of service (NULL pointer dereference in the radiotap parser) by     injecting a frame with 802.11a rates. (CVE-2021-38206)

  - drivers/net/ethernet/xilinx/ll_temac_main.c in the Linux kernel before 5.12.13 allows remote attackers to     cause a denial of service (buffer overflow and lockup) by sending heavy network traffic for about ten     minutes. (CVE-2021-38207)

  - net/netfilter/nf_conntrack_standalone.c in the Linux kernel before 5.12.2 allows observation of changes in     any net namespace because these changes are leaked into all other net namespaces. This is related to the     NF_SYSCTL_CT_MAX, NF_SYSCTL_CT_EXPECT_MAX, and NF_SYSCTL_CT_BUCKETS sysctls. (CVE-2021-38209)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-5115-1 advisory.

    It was discovered that a race condition existed in the Atheros Ath9k WiFi driver in the Linux kernel. An     attacker could possibly use this to expose sensitive information (WiFi network traffic). (CVE-2020-3702)

    Ofek Kirzner, Adam Morrison, Benedict Schlueter, and Piotr Krysiuk discovered that the BPF verifier in the     Linux kernel missed possible mispredicted branches due to type confusion, allowing a side-channel attack.
    An attacker could use this to expose sensitive information. (CVE-2021-33624)

    Benedict Schlueter discovered that the BPF subsystem in the Linux kernel did not properly protect against     Speculative Store Bypass (SSB) side- channel attacks in some situations. A local attacker could possibly     use this to expose sensitive information. (CVE-2021-34556)

    Piotr Krysiuk discovered that the BPF subsystem in the Linux kernel did not properly protect against     Speculative Store Bypass (SSB) side-channel attacks in some situations. A local attacker could possibly     use this to expose sensitive information. (CVE-2021-35477)

    It was discovered that the tracing subsystem in the Linux kernel did not properly keep track of per-cpu     ring buffer state. A privileged attacker could use this to cause a denial of service. (CVE-2021-3679)

    It was discovered that the Option USB High Speed Mobile device driver in the Linux kernel did not properly     handle error conditions. A physically proximate attacker could use this to cause a denial of service     (system crash) or possibly execute arbitrary code. (CVE-2021-37159)

    Alois Wohlschlager discovered that the overlay file system in the Linux kernel did not restrict private     clones in some situations. An attacker could use this to expose sensitive information. (CVE-2021-3732)

    It was discovered that the btrfs file system in the Linux kernel did not properly handle removing a non-     existent device id. An attacker with CAP_SYS_ADMIN could use this to cause a denial of service.
    (CVE-2021-3739)

    It was discovered that the Qualcomm IPC Router protocol implementation in the Linux kernel did not     properly validate metadata in some situations. A local attacker could use this to cause a denial of     service (system crash) or expose sensitive information. (CVE-2021-3743)

    It was discovered that the virtual terminal (vt) device implementation in the Linux kernel contained a     race condition in its ioctl handling that led to an out-of-bounds read vulnerability. A local attacker     could possibly use this to expose sensitive information. (CVE-2021-3753)

    It was discovered that the Linux kernel did not properly account for the memory usage of certain IPC     objects. A local attacker could use this to cause a denial of service (memory exhaustion). (CVE-2021-3759)

    It was discovered that the BPF subsystem in the Linux kernel contained an integer overflow in its hash     table implementation. A local attacker could use this to cause a denial of service (system crash) or     possibly execute arbitrary code. (CVE-2021-38166)

    It was discovered that the MAX-3421 host USB device driver in the Linux kernel did not properly handle     device removal events. A physically proximate attacker could use this to cause a denial of service (system     crash). (CVE-2021-38204)

    It was discovered that the Xilinx 10/100 Ethernet Lite device driver in the Linux kernel could report     pointer addresses in some situations. An attacker could use this information to ease the exploitation of     another vulnerability. (CVE-2021-38205)

    It was discovered that the ext4 file system in the Linux kernel contained a race condition when writing     xattrs to an inode. A local attacker could use this to cause a denial of service or possibly gain     administrative privileges. (CVE-2021-40490)

    It was discovered that the 6pack network protocol driver in the Linux kernel did not properly perform     validation checks. A privileged attacker could use this to cause a denial of service (system crash) or     execute arbitrary code. (CVE-2021-42008)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Published	Updated	Severity
223990	Linux Distros Unpatched Vulnerability : CVE-2021-38166	Nessus	Misc.	3/5/2025	3/5/2025	high
153789	Ubuntu 20.04 LTS : Linux kernel (OEM) vulnerabilities (USN-5096-1)	Nessus	Ubuntu Local Security Checks	9/30/2021	8/28/2024	high
153542	SUSE SLES15 Security Update : kernel (SUSE-SU-2021:3179-1)	Nessus	SuSE Local Security Checks	9/22/2021	7/13/2023	high
160446	Amazon Linux 2 : kernel (ALASKERNEL-5.10-2022-005)	Nessus	Amazon Linux Local Security Checks	5/2/2022	12/11/2024	high
153668	Debian DSA-4978-1 : linux - security update	Nessus	Debian Local Security Checks	9/25/2021	1/24/2025	high
151965	Photon OS 4.0: Linux PHSA-2021-4.0-0065	Nessus	PhotonOS Local Security Checks	7/22/2021	4/10/2025	critical
153598	openSUSE 15 Security Update : kernel (openSUSE-SU-2021:3205-1)	Nessus	SuSE Local Security Checks	9/24/2021	11/29/2023	high
153035	Photon OS 4.0: Linux PHSA-2021-4.0-0095	Nessus	PhotonOS Local Security Checks	9/7/2021	2/14/2025	high
154241	Ubuntu 20.04 LTS : Linux kernel vulnerabilities (USN-5113-1)	Nessus	Ubuntu Local Security Checks	10/20/2021	8/27/2024	high
153541	openSUSE 15 Security Update : kernel (openSUSE-SU-2021:3179-1)	Nessus	SuSE Local Security Checks	9/22/2021	11/30/2023	high
153622	SUSE SLED15 / SLES15 Security Update : kernel (SUSE-SU-2021:3205-1)	Nessus	SuSE Local Security Checks	9/24/2021	7/13/2023	high
154279	Ubuntu 20.04 LTS : Linux kernel (OEM) vulnerabilities (USN-5115-1)	Nessus	Ubuntu Local Security Checks	10/20/2021	8/28/2024	high

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