=========================================================================
Ubuntu Security Notice USN-5295-1
February 18, 2022

linux-hwe-5.13 vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-hwe-5.13: Linux hardware enablement (HWE) kernel

Details:

It was discovered that the Packet network protocol implementation in the
Linux kernel contained a double-free vulnerability. A local attacker could
use this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2021-22600)

Jann Horn discovered a race condition in the Unix domain socket
implementation in the Linux kernel that could result in a read-after-free.
A local attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2021-4083)

Kirill Tkhai discovered that the XFS file system implementation in the
Linux kernel did not calculate size correctly when pre-allocating space in
some situations. A local attacker could use this to expose sensitive
information. (CVE-2021-4155)

Sushma Venkatesh Reddy discovered that the Intel i915 graphics driver in
the Linux kernel did not perform a GPU TLB flush in some situations. A
local attacker could use this to cause a denial of service or possibly
execute arbitrary code. (CVE-2022-0330)

It was discovered that the VMware Virtual GPU driver in the Linux kernel
did not properly handle certain failure conditions, leading to a stale
entry in the file descriptor table. A local attacker could use this to
expose sensitive information or possibly gain administrative privileges.
(CVE-2022-22942)

Update instructions:

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

Ubuntu 20.04 LTS:
  linux-image-5.13.0-30-generic   5.13.0-30.33~20.04.1
  linux-image-5.13.0-30-generic-64k  5.13.0-30.33~20.04.1
  linux-image-5.13.0-30-generic-lpae  5.13.0-30.33~20.04.1
  linux-image-5.13.0-30-lowlatency  5.13.0-30.33~20.04.1
  linux-image-generic-64k-hwe-20.04  5.13.0.30.33~20.04.17
  linux-image-generic-hwe-20.04   5.13.0.30.33~20.04.17
  linux-image-generic-lpae-hwe-20.04  5.13.0.30.33~20.04.17
  linux-image-lowlatency-hwe-20.04  5.13.0.30.33~20.04.17
  linux-image-virtual-hwe-20.04   5.13.0.30.33~20.04.17

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.

References:
  https://ubuntu.com/security/notices/USN-5295-1
  CVE-2021-22600, CVE-2021-4083, CVE-2021-4155, CVE-2022-0330,
  CVE-2022-22942

Package Information:
  https://launchpad.net/ubuntu/+source/linux-hwe-5.13/5.13.0-30.33~20.04.1