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             AUSCERT External Security Bulletin Redistribution

                    Linux kernel (OEM) vulnerabilities
                             23 February 2022


        AusCERT Security Bulletin Summary

Product:           Linux kernel (OEM)
Publisher:         Ubuntu
Operating System:  Ubuntu
Resolution:        Patch/Upgrade
CVE Names:         CVE-2022-24959 CVE-2022-24448 CVE-2022-0492
                   CVE-2022-0435 CVE-2021-44879 CVE-2021-43976

Original Bulletin: 

Comment: CVSS (Max):  7.1 CVE-2022-0435 (CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H)
         CVSS Source: Red Hat
         Calculator:  https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

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USN-5302-1: Linux kernel (OEM) vulnerabilities
22 February 2022

Several security issues were fixed in the Linux kernel.

  o Ubuntu 20.04 LTS


  o linux-oem-5.14 - Linux kernel for OEM systems


Yiqi Sun and Kevin Wang discovered that the cgroups implementation in the
Linux kernel did not properly restrict access to the cgroups v1
release_agent feature. A local attacker could use this to gain
administrative privileges. ( CVE-2022-0492 )

Brendan Dolan-Gavitt discovered that the Marvell WiFi-Ex USB device driver
in the Linux kernel did not properly handle some error conditions. A
physically proximate attacker could use this to cause a denial of service
(system crash). ( CVE-2021-43976 )

Wenqing Liu discovered that the f2fs file system implementation in the
Linux kernel did not properly validate inode types while performing garbage
collection. An attacker could use this to construct a malicious f2fs image
that, when mounted and operated on, could cause a denial of service (system
crash). ( CVE-2021-44879 )

Samuel Page discovered that the Transparent Inter-Process Communication
(TIPC) protocol implementation in the Linux kernel contained a stack-based
buffer overflow. A remote attacker could use this to cause a denial of
service (system crash) for systems that have a TIPC bearer configured.
( CVE-2022-0435 )

Lyu Tao discovered that the NFS implementation in the Linux kernel did not
properly handle requests to open a directory on a regular file. A local
attacker could use this to expose sensitive information (kernel memory).
( CVE-2022-24448 )

It was discovered that the YAM AX.25 device driver in the Linux kernel did
not properly deallocate memory in some error conditions. A local privileged
attacker could use this to cause a denial of service (kernel memory
exhaustion). ( CVE-2022-24959 )

Update instructions

The problem can be corrected by updating your system to the following package

Ubuntu 20.04

  o linux-image-oem-20.04c -
  o linux-image-oem-20.04b -
  o linux-image-oem-20.04d -
  o linux-image-oem-20.04 -
  o linux-image-5.14.0-1024-oem - 5.14.0-1024.26

After a standard system update you need to reboot your computer to make
all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.


  o CVE-2022-24448
  o CVE-2021-44879
  o CVE-2022-0435
  o CVE-2022-24959
  o CVE-2022-0492
  o CVE-2021-43976

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