An issue was discovered in ioapic_lazy_update_eoi in arch/x86/kvm/ioapic.c in the Linux kernel before 5.9.2. It has an infinite loop related to improper interaction between a resampler and edge triggering, aka CID-77377064c3a9.

An update of the linux package has been released.

The remote AlmaLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2021:1093 advisory.

  - In do_epoll_ctl and ep_loop_check_proc of eventpoll.c, there is a possible use after free due to a logic     error. This could lead to local escalation of privilege with no additional execution privileges needed.
    User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID:
    A-147802478References: Upstream kernel (CVE-2020-0466)

  - An issue was discovered in ioapic_lazy_update_eoi in arch/x86/kvm/ioapic.c in the Linux kernel before     5.9.2. It has an infinite loop related to improper interaction between a resampler and edge triggering,     aka CID-77377064c3a9. (CVE-2020-27152)

  - In drivers/target/target_core_xcopy.c in the Linux kernel before 5.10.7, insufficient identifier checking     in the LIO SCSI target code can be used by remote attackers to read or write files via directory traversal     in an XCOPY request, aka CID-2896c93811e3. For example, an attack can occur over a network if the attacker     has access to one iSCSI LUN. The attacker gains control over file access because I/O operations are     proxied via an attacker-selected backstore. (CVE-2020-28374)

  - An issue was discovered in the Linux kernel through 5.10.11. PI futexes have a kernel stack use-after-free     during fault handling, allowing local users to execute code in the kernel, aka CID-34b1a1ce1458.
    (CVE-2021-3347)

  - A local privilege escalation was discovered in the Linux kernel before 5.10.13. Multiple race conditions     in the AF_VSOCK implementation are caused by wrong locking in net/vmw_vsock/af_vsock.c. The race     conditions were implicitly introduced in the commits that added VSOCK multi-transport support.
    (CVE-2021-26708)

  - An issue was discovered in the Linux kernel through 5.11.3. A kernel pointer leak can be used to determine     the address of the iscsi_transport structure. When an iSCSI transport is registered with the iSCSI     subsystem, the transport's handle is available to unprivileged users via the sysfs file system, at     /sys/class/iscsi_transport/$TRANSPORT_NAME/handle. When read, the show_transport_handle function (in     drivers/scsi/scsi_transport_iscsi.c) is called, which leaks the handle. This handle is actually the     pointer to an iscsi_transport struct in the kernel module's global variables. (CVE-2021-27363)

  - An issue was discovered in the Linux kernel through 5.11.3. drivers/scsi/scsi_transport_iscsi.c is     adversely affected by the ability of an unprivileged user to craft Netlink messages. (CVE-2021-27364)

  - An issue was discovered in the Linux kernel through 5.11.3. Certain iSCSI data structures do not have     appropriate length constraints or checks, and can exceed the PAGE_SIZE value. An unprivileged user can     send a Netlink message that is associated with iSCSI, and has a length up to the maximum length of a     Netlink message. (CVE-2021-27365)

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

The remote CentOS Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the CESA-2021:1093 advisory.

  - kernel: use after free in eventpoll.c may lead to escalation of privilege (CVE-2020-0466)

  - Kernel: KVM: host stack overflow due to lazy update IOAPIC (CVE-2020-27152)

  - kernel: SCSI target (LIO) write to any block on ILO backstore (CVE-2020-28374)

  - kernel: race conditions caused by wrong locking in net/vmw_vsock/af_vsock.c (CVE-2021-26708)

  - kernel: iscsi: unrestricted access to sessions and handles (CVE-2021-27363)

  - kernel: out-of-bounds read in libiscsi module (CVE-2021-27364)

  - kernel: heap buffer overflow in the iSCSI subsystem (CVE-2021-27365)

  - kernel: Use after free via PI futex state (CVE-2021-3347)

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

The remote Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2021-1093 advisory.

    - futex: Handle faults correctly for PI futexes (Waiman Long) [1924633 1924635] {CVE-2021-3347}
    - futex: Simplify fixup_pi_state_owner() (Waiman Long) [1924633 1924635] {CVE-2021-3347}
    - futex: Use pi_state_update_owner() in put_pi_state() (Waiman Long) [1924633 1924635] {CVE-2021-3347}
    - futex: Provide and use pi_state_update_owner() (Waiman Long) [1924633 1924635] {CVE-2021-3347}
    - rtmutex: Remove unused argument from rt_mutex_proxy_unlock() (Waiman Long) [1924633 1924635]     {CVE-2021-3347}
    - futex: Replace pointless printk in fixup_owner() (Waiman Long) [1924633 1924635] {CVE-2021-3347}
    - futex: Ensure the correct return value from futex_lock_pi() (Waiman Long) [1924633 1924635]     {CVE-2021-3347}
    - futex: Don't enable IRQs unconditionally in put_pi_state() (Waiman Long) [1924633 1924635]     {CVE-2021-3347}
    - futex: Fix incorrect should_fail_futex() handling (Waiman Long) [1924633 1924635] {CVE-2021-3347}
    - futex: Consistently use fshared as boolean (Waiman Long) [1924633 1924635] {CVE-2021-3347}
    - futex: Remove needless goto's (Waiman Long) [1924633 1924635] {CVE-2021-3347}
    - futex: Remove put_futex_key() (Waiman Long) [1924633 1924635] {CVE-2021-3347}
    - scsi: iscsi: Verify lengths on passthrough PDUs (Chris Leech) [1930832 1930833] {CVE-2021-27364}
    - scsi: iscsi: Ensure sysfs attributes are limited to PAGE_SIZE (Chris Leech) [1930855 1930856]     {CVE-2021-27365}
    - scsi: iscsi: Restrict sessions and handles to admin capabilities (Chris Leech) [1940423 1930809]     {CVE-2021-27363}
    - fix regression in 'epoll: Keep a reference on files added to the check list' (Carlos Maiolino) [1920775     1920776] {CVE-2020-0466}
    - do_epoll_ctl(): clean the failure exits up a bit (Carlos Maiolino) [1920775 1920776] {CVE-2020-0466}
    - epoll: Keep a reference on files added to the check list (Carlos Maiolino) [1920775 1920776]     {CVE-2020-0466}
    - net/vmw_vsock: fix NULL pointer dereference (Jon Maloy) [1925599 1925600] {CVE-2021-26708}
    - net/vmw_vsock: improve locking in vsock_connect_timeout() (Jon Maloy) [1925599 1925600] {CVE-2021-26708}
    - vsock: fix locking in vsock_shutdown() (Jon Maloy) [1925599 1925600] {CVE-2021-26708}
    - vsock: fix the race conditions in multi-transport support (Jon Maloy) [1925599 1925600] {CVE-2021-26708}
    - [target] scsi: target: Fix XCOPY NAA identifier lookup (Maurizio Lombardi) [1900462 1900463]     {CVE-2020-28374}

Tenable has extracted the preceding description block directly from the Oracle Linux 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 Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:1093 advisory.

  - kernel: use after free in eventpoll.c may lead to escalation of privilege (CVE-2020-0466)

  - Kernel: KVM: host stack overflow due to lazy update IOAPIC (CVE-2020-27152)

  - kernel: SCSI target (LIO) write to any block on ILO backstore (CVE-2020-28374)

  - kernel: Use after free via PI futex state (CVE-2021-3347)

  - kernel: race conditions caused by wrong locking in net/vmw_vsock/af_vsock.c (CVE-2021-26708)

  - kernel: iscsi: unrestricted access to sessions and handles (CVE-2021-27363)

  - kernel: out-of-bounds read in libiscsi module (CVE-2021-27364)

  - kernel: heap buffer overflow in the iSCSI subsystem (CVE-2021-27365)

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

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:1081 advisory.

    The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with     extremely high determinism requirements.

    Security Fix(es):

    * kernel: use after free in eventpoll.c may lead to escalation of privilege (CVE-2020-0466)

    * kernel: SCSI target (LIO) write to any block on ILO backstore (CVE-2020-28374)

    * kernel: Use after free via PI futex state (CVE-2021-3347)

    * kernel: race conditions caused by wrong locking in net/vmw_vsock/af_vsock.c (CVE-2021-26708)

    * kernel: out-of-bounds read in libiscsi module (CVE-2021-27364)

    * kernel: heap buffer overflow in the iSCSI subsystem (CVE-2021-27365)

    * Kernel: KVM: host stack overflow due to lazy update IOAPIC (CVE-2020-27152)

    * kernel: iscsi: unrestricted access to sessions and handles (CVE-2021-27363)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

    Bug Fix(es):

    * kernel-rt possible livelock: WARNING: CPU: 28 PID: 3109 at kernel/ptrace.c:242     ptrace_check_attach+0xdd/0x1a0 (BZ#1925308)

    * kernel-rt: update RT source tree to the RHEL-8.3.z3 source tree (BZ#1926369)

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux 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 Ubuntu 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-4752-1 advisory.

    Daniele Antonioli, Nils Ole Tippenhauer, and Kasper Rasmussen discovered that legacy pairing and secure-     connections pairing authentication in the Bluetooth protocol could allow an unauthenticated user to     complete authentication without pairing credentials via adjacent access. A physically proximate attacker     could use this to impersonate a previously paired Bluetooth device. (CVE-2020-10135)

    Jay Shin discovered that the ext4 file system implementation in the Linux kernel did not properly handle     directory access with broken indexing, leading to an out-of-bounds read vulnerability. A local attacker     could use this to cause a denial of service (system crash). (CVE-2020-14314)

    It was discovered that the block layer implementation in the Linux kernel did not properly perform     reference counting in some situations, leading to a use-after-free vulnerability. A local attacker could     use this to cause a denial of service (system crash). (CVE-2020-15436)

    It was discovered that the serial port driver in the Linux kernel did not properly initialize a pointer in     some situations. A local attacker could possibly use this to cause a denial of service (system crash).
    (CVE-2020-15437)

    Andy Nguyen discovered that the Bluetooth HCI event packet parser in the Linux kernel did not properly     handle event advertisements of certain sizes, leading to a heap-based buffer overflow. A physically     proximate remote attacker could use this to cause a denial of service (system crash) or possibly execute     arbitrary code. (CVE-2020-24490)

    It was discovered that the NFS client implementation in the Linux kernel did not properly perform bounds     checking before copying security labels in some situations. A local attacker could use this to cause a     denial of service (system crash) or possibly execute arbitrary code. (CVE-2020-25212)

    It was discovered that the Rados block device (rbd) driver in the Linux kernel did not properly perform     privilege checks for access to rbd devices in some situations. A local attacker could use this to map or     unmap rbd block devices. (CVE-2020-25284)

    It was discovered that the block layer subsystem in the Linux kernel did not properly handle zero-length     requests. A local attacker could use this to cause a denial of service. (CVE-2020-25641)

    It was discovered that the HDLC PPP implementation in the Linux kernel did not properly validate input in     some situations. A local attacker could use this to cause a denial of service (system crash) or possibly     execute arbitrary code. (CVE-2020-25643)

    Kiyin () discovered that the perf subsystem in the Linux kernel did not properly deallocate memory     in some situations. A privileged attacker could use this to cause a denial of service (kernel memory     exhaustion). (CVE-2020-25704)

    It was discovered that the KVM hypervisor in the Linux kernel did not properly handle interrupts in     certain situations. A local attacker in a guest VM could possibly use this to cause a denial of service     (host system crash). (CVE-2020-27152)

    It was discovered that the jfs file system implementation in the Linux kernel contained an out-of-bounds     read vulnerability. A local attacker could use this to possibly cause a denial of service (system crash).
    (CVE-2020-27815)

    It was discovered that an information leak existed in the syscall implementation in the Linux kernel on 32     bit systems. A local attacker could use this to expose sensitive information (kernel memory).
    (CVE-2020-28588)

    It was discovered that the framebuffer implementation in the Linux kernel did not properly perform range     checks in certain situations. A local attacker could use this to expose sensitive information (kernel     memory). (CVE-2020-28915)

    Jann Horn discovered a race condition in the copy-on-write implementation in the Linux kernel when     handling hugepages. A local attacker could use this to gain unintended write access to read-only memory     pages. (CVE-2020-29368)

    Jann Horn discovered that the mmap implementation in the Linux kernel contained a race condition when     handling munmap() operations, leading to a read-after-free vulnerability. A local attacker could use this     to cause a denial of service (system crash) or possibly expose sensitive information. (CVE-2020-29369)

    Jann Horn discovered that the romfs file system in the Linux kernel did not properly validate file system     meta-data, leading to an out-of-bounds read. An attacker could use this to construct a malicious romfs     image that, when mounted, exposed sensitive information (kernel memory). (CVE-2020-29371)

    Jann Horn discovered that the tty subsystem of the Linux kernel did not use consistent locking in some     situations, leading to a read-after-free vulnerability. A local attacker could use this to cause a denial     of service (system crash) or possibly expose sensitive information (kernel memory). (CVE-2020-29660)

    Jann Horn discovered a race condition in the tty subsystem of the Linux kernel in the locking for the     TIOCSPGRP ioctl(), leading to a use-after- free vulnerability. A local attacker could use this to cause a     denial of service (system crash) or possibly execute arbitrary code. (CVE-2020-29661)

    It was discovered that a race condition existed that caused the Linux kernel to not properly restrict exit     signal delivery. A local attacker could possibly use this to send signals to arbitrary processes.
    (CVE-2020-35508)

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 Ubuntu 20.10 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4659-1 advisory.

    Several security issues were fixed in the Linux kernel.

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	Severity
203339	Photon OS 4.0: Linux PHSA-2023-4.0-0318	Nessus	PhotonOS Local Security Checks	high
157559	AlmaLinux 8 : kernel (ALSA-2021:1093)	Nessus	Alma Linux Local Security Checks	high
148422	CentOS 8 : kernel (CESA-2021:1093)	Nessus	CentOS Local Security Checks	high
148371	Oracle Linux 8 : kernel (ELSA-2021-1093)	Nessus	Oracle Linux Local Security Checks	high
148370	RHEL 8 : kernel (RHSA-2021:1093)	Nessus	Red Hat Local Security Checks	high
148369	RHEL 8 : kernel-rt (RHSA-2021:1081)	Nessus	Red Hat Local Security Checks	high
147982	Ubuntu 20.04 LTS : Linux kernel (OEM) vulnerabilities (USN-4752-1)	Nessus	Ubuntu Local Security Checks	high
143429	Ubuntu 20.10 : Linux kernel vulnerabilities (USN-4659-1)	Nessus	Ubuntu Local Security Checks	high

Detections

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CVE-2020-27152

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