[USN-5295-1] Linux kernel (HWE) vulnerabilities
steve.beattie at canonical.com
Fri Feb 18 00:50:55 UTC 2022
Ubuntu Security Notice USN-5295-1
February 18, 2022
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
Several security issues were fixed in the Linux kernel.
- linux-hwe-5.13: Linux hardware enablement (HWE) kernel
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
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.
The problem can be corrected by updating your system to the following
Ubuntu 20.04 LTS:
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.
CVE-2021-22600, CVE-2021-4083, CVE-2021-4155, CVE-2022-0330,
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