The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:4356 advisory.

    The kernel packages contain the Linux kernel, the core of any Linux operating system.

    Security Fix(es):
    * kernel: out-of-bounds reads in pinctrl subsystem (CVE-2020-0427)
    * kernel: Improper input validation in some Intel(R) Ethernet E810 Adapter drivers (CVE-2020-24502)
    * kernel: Insufficient access control in some Intel(R) Ethernet E810 Adapter drivers (CVE-2020-24503)
    * kernel: Uncontrolled resource consumption in some Intel(R) Ethernet E810 Adapter drivers     (CVE-2020-24504)
    * kernel: Fragmentation cache not cleared on reconnection (CVE-2020-24586)
    * kernel: Reassembling fragments encrypted under different keys (CVE-2020-24587)
    * kernel: wifi frame payload being parsed incorrectly as an L2 frame (CVE-2020-24588)
    * kernel: Forwarding EAPOL from unauthenticated wifi client (CVE-2020-26139)
    * kernel: accepting plaintext data frames in protected networks (CVE-2020-26140)
    * kernel: not verifying TKIP MIC of fragmented frames (CVE-2020-26141)
    * kernel: accepting fragmented plaintext frames in protected networks (CVE-2020-26143)
    * kernel: accepting unencrypted A-MSDU frames that start with RFC1042 header (CVE-2020-26144)
    * kernel: accepting plaintext broadcast fragments as full frames (CVE-2020-26145)
    * kernel: powerpc: RTAS calls can be used to compromise kernel integrity (CVE-2020-27777)
    * kernel: locking inconsistency in tty_io.c and tty_jobctrl.c can lead to a read-after-free     (CVE-2020-29660)
    * kernel: buffer overflow in mwifiex_cmd_802_11_ad_hoc_start function via a long SSID value     (CVE-2020-36158)
    * kernel: slab out-of-bounds read in hci_extended_inquiry_result_evt()  (CVE-2020-36386)
    * kernel: Improper access control in BlueZ may allow information disclosure vulnerability. (CVE-2021-0129)
    * kernel: Use-after-free in ndb_queue_rq() in drivers/block/nbd.c (CVE-2021-3348)
    * kernel: Linux kernel eBPF RINGBUF map oversized allocation (CVE-2021-3489)
    * kernel: double free in bluetooth subsystem when the HCI device initialization fails (CVE-2021-3564)
    * kernel: use-after-free in function hci_sock_bound_ioctl() (CVE-2021-3573)
    * kernel: eBPF 32-bit source register truncation on div/mod (CVE-2021-3600)
    * kernel: DoS in rb_per_cpu_empty() (CVE-2021-3679)
    * kernel: Mounting overlayfs inside an unprivileged user namespace can reveal files (CVE-2021-3732)
    * kernel: heap overflow in __cgroup_bpf_run_filter_getsockopt() (CVE-2021-20194)
    * kernel: Race condition in sctp_destroy_sock list_del (CVE-2021-23133)
    * kernel: fuse: stall on CPU can occur because a retry loop continually finds the same bad inode     (CVE-2021-28950)
    * kernel: System crash in intel_pmu_drain_pebs_nhm in arch/x86/events/intel/ds.c (CVE-2021-28971)
    * kernel: protection can be bypassed to leak content of kernel memory (CVE-2021-29155)
    * kernel: improper input validation in tipc_nl_retrieve_key function in net/tipc/node.c (CVE-2021-29646)
    * kernel: lack a full memory barrier may lead to DoS (CVE-2021-29650)
    * kernel: local escalation of privileges in handling of eBPF programs (CVE-2021-31440)
    * kernel: protection of stack pointer against speculative pointer arithmetic can be bypassed to leak     content of kernel memory (CVE-2021-31829)
    * kernel: out-of-bounds reads and writes due to enforcing incorrect limits for pointer arithmetic     operations by BPF verifier (CVE-2021-33200)
    * kernel: reassembling encrypted fragments with non-consecutive packet numbers (CVE-2020-26146)
    * kernel: reassembling mixed encrypted/plaintext fragments (CVE-2020-26147)
    * kernel: the copy-on-write implementation can grant unintended write access because of a race condition     in a THP mapcount check (CVE-2020-29368)
    * kernel: flowtable list del corruption with kernel BUG at lib/list_debug.c:50 (CVE-2021-3635)
    * kernel: NULL pointer dereference in llsec_key_alloc() in net/mac802154/llsec.c (CVE-2021-3659)
    * kernel: setsockopt System Call Untrusted Pointer Dereference Information Disclosure (CVE-2021-20239)
    * kernel: out of bounds array access in drivers/md/dm-ioctl.c (CVE-2021-31916)

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.

Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks.

CVE-2019-19318, CVE-2019-19813, CVE-2019-19816

'Team bobfuzzer' reported bugs in Btrfs that could lead to a use-after-free or heap buffer overflow, and could be triggered by crafted filesystem images. A user permitted to mount and access arbitrary filesystems could use these to cause a denial of service (crash or memory corruption) or possibly for privilege escalation.

CVE-2020-27815

A flaw was reported in the JFS filesystem code allowing a local attacker with the ability to set extended attributes to cause a denial of service.

CVE-2020-27825

Adam 'pi3' Zabrocki reported a use-after-free flaw in the ftrace ring buffer resizing logic due to a race condition, which could result in denial of service or information leak.

CVE-2020-28374

David Disseldorp discovered that the LIO SCSI target implementation performed insufficient checking in certain XCOPY requests. An attacker with access to a LUN and knowledge of Unit Serial Number assignments can take advantage of this flaw to read and write to any LIO backstore, regardless of the SCSI transport settings.

CVE-2020-29568 (XSA-349)

Michael Kurth and Pawel Wieczorkiewicz reported that frontends can trigger OOM in backends by updating a watched path.

CVE-2020-29569 (XSA-350)

Olivier Benjamin and Pawel Wieczorkiewicz reported a use-after-free flaw which can be triggered by a block frontend in Linux blkback. A misbehaving guest can trigger a dom0 crash by continuously connecting / disconnecting a block frontend.

CVE-2020-29660

Jann Horn reported a locking inconsistency issue in the tty subsystem which may allow a local attacker to mount a read-after-free attack against TIOCGSID.

CVE-2020-29661

Jann Horn reported a locking issue in the tty subsystem which can result in a use-after-free. A local attacker can take advantage of this flaw for memory corruption or privilege escalation.

CVE-2020-36158

A buffer overflow flaw was discovered in the mwifiex WiFi driver which could result in denial of service or the execution of arbitrary code via a long SSID value.

CVE-2021-3178

&#x5434;&#x5F02; reported an information leak in the NFSv3 server.
When only a subdirectory of a filesystem volume is exported, an NFS client listing the exported directory would obtain a file handle to the parent directory, allowing it to access files that were not meant to be exported.

Even after this update, it is still possible for NFSv3 clients to guess valid file handles and access files outside an exported subdirectory, unless the 'subtree_check' export option is enabled. It is recommended that you do not use that option but only export whole filesystem volumes.

CVE-2021-3347

It was discovered that PI futexes have a kernel stack use-after-free during fault handling. An unprivileged user could use this flaw to crash the kernel (resulting in denial of service) or for privilege escalation.

CVE-2021-26930 (XSA-365)

Olivier Benjamin, Norbert Manthey, Martin Mazein, and Jan H.
Sch&ouml;nherr discovered that the Xen block backend driver (xen-blkback) did not handle grant mapping errors correctly. A malicious guest could exploit this bug to cause a denial of service (crash), or possibly an information leak or privilege escalation, within the domain running the backend, which is typically dom0.

CVE-2021-26931 (XSA-362), CVE-2021-26932 (XSA-361), CVE-2021-28038 (XSA-367)

Jan Beulich discovered that the Xen support code and various Xen backend drivers did not handle grant mapping errors correctly. A malicious guest could exploit these bugs to cause a denial of service (crash) within the domain running the backend, which is typically dom0.

CVE-2021-27363

Adam Nichols reported that the iSCSI initiator subsystem did not properly restrict access to transport handle attributes in sysfs. On a system acting as an iSCSI initiator, this is an information leak to local users and makes it easier to exploit CVE-2021-27364.

CVE-2021-27364

Adam Nichols reported that the iSCSI initiator subsystem did not properly restrict access to its netlink management interface. On a system acting as an iSCSI initiator, a local user could use these to cause a denial of service (disconnection of storage) or possibly for privilege escalation.

CVE-2021-27365

Adam Nichols reported that the iSCSI initiator subsystem did not correctly limit the lengths of parameters or 'passthrough PDUs' sent through its netlink management interface. On a system acting as an iSCSI initiator, a local user could use these to leak the contents of kernel memory, to cause a denial of service (kernel memory corruption or crash), and probably for privilege escalation.

For Debian 9 stretch, these problems have been fixed in version 4.9.258-1.

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

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks.

  - CVE-2020-27815     A flaw was reported in the JFS filesystem code allowing     a local attacker with the ability to set extended     attributes to cause a denial of service.

  - CVE-2020-27825     Adam 'pi3' Zabrocki reported a use-after-free flaw in     the ftrace ring buffer resizing logic due to a race     condition, which could result in denial of service or     information leak.

  - CVE-2020-27830     Shisong Qin reported a NULL pointer dereference flaw in     the Speakup screen reader core driver.

  - CVE-2020-28374     David Disseldorp discovered that the LIO SCSI target     implementation performed insufficient checking in     certain XCOPY requests. An attacker with access to a LUN     and knowledge of Unit Serial Number assignments can take     advantage of this flaw to read and write to any LIO     backstore, regardless of the SCSI transport settings.

  - CVE-2020-29568 (XSA-349)     Michael Kurth and Pawel Wieczorkiewicz reported that     frontends can trigger OOM in backends by updating a     watched path.

  - CVE-2020-29569 (XSA-350)     Olivier Benjamin and Pawel Wieczorkiewicz reported a     use-after-free flaw which can be triggered by a block     frontend in Linux blkback. A misbehaving guest can     trigger a dom0 crash by continuously connecting /     disconnecting a block frontend.

  - CVE-2020-29660     Jann Horn reported a locking inconsistency issue in the     tty subsystem which may allow a local attacker to mount     a read-after-free attack against TIOCGSID.

  - CVE-2020-29661     Jann Horn reported a locking issue in the tty subsystem     which can result in a use-after-free. A local attacker     can take advantage of this flaw for memory corruption or     privilege escalation.

  - CVE-2020-36158     A buffer overflow flaw was discovered in the mwifiex     WiFi driver which could result in denial of service or     the execution of arbitrary code via a long SSID value.

  - CVE-2021-3347     It was discovered that PI futexes have a kernel stack     use-after-free during fault handling. An unprivileged     user could use this flaw to crash the kernel (resulting     in denial of service) or for privilege escalation.

  - CVE-2021-20177     A flaw was discovered in the Linux implementation of     string matching within a packet. A privileged user (with     root or CAP_NET_ADMIN) can take advantage of this flaw     to cause a kernel panic when inserting iptables rules.

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2021-9035 advisory.

    - target: fix XCOPY NAA identifier lookup (David Disseldorp)  [Orabug: 32248040]  {CVE-2020-28374}
    - tty: Fix ->session locking (Jann Horn)  [Orabug: 32266681]  {CVE-2020-29660}
    - tty: Fix ->pgrp locking in tiocspgrp() (Jann Horn)  [Orabug: 32266681]  {CVE-2020-29660}
    - mwifiex: Fix possible buffer overflows in mwifiex_cmd_802_11_ad_hoc_start (Zhang Xiaohui)  [Orabug:
    32349207]  {CVE-2020-36158}

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.

ID	Name	Product	Family	Published	Updated	Severity
155219	RHEL 8 : kernel (RHSA-2021:4356)	Nessus	Red Hat Local Security Checks	11/11/2021	11/7/2024	high
147532	Debian DLA-2586-1 : linux security update	Nessus	Debian Local Security Checks	3/10/2021	1/16/2024	high
145320	openSUSE Security Update : the Linux Kernel (openSUSE-2021-60)	Nessus	SuSE Local Security Checks	1/25/2021	2/9/2023	critical
146052	Debian DSA-4843-1 : linux - security update	Nessus	Debian Local Security Checks	2/2/2021	3/27/2024	high
146300	Oracle Linux 7 : Unbreakable Enterprise kernel (ELSA-2021-9035)	Nessus	Oracle Linux Local Security Checks	2/8/2021	11/1/2024	high

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