A Linux kernel (OEM) security update has been released for Ubuntu Linux 20.04 LTS and 22.04 LTS.

USN-5567-1: Linux kernel (OEM) vulnerabilities

==========================================================================
Ubuntu Security Notice USN-5567-1
August 10, 2022

linux-oem-5.14, linux-oem-5.17 vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-oem-5.17: Linux kernel for OEM systems
- linux-oem-5.14: Linux kernel for OEM systems

Details:

Zhenpeng Lin discovered that the network packet scheduler implementation in
the Linux kernel did not properly remove all references to a route filter
before freeing it in some situations. A local attacker could use this to
cause a denial of service (system crash) or execute arbitrary code.
(CVE-2022-2588)

It was discovered that the netfilter subsystem of the Linux kernel did not
prevent one nft object from referencing an nft set in another nft table,
leading to a use-after-free vulnerability. A local attacker could use this
to cause a denial of service (system crash) or execute arbitrary code.
(CVE-2022-2586)

It was discovered that the implementation of POSIX timers in the Linux
kernel did not properly clean up timers in some situations. A local
attacker could use this to cause a denial of service (system crash) or
execute arbitrary code. (CVE-2022-2585)

Update instructions:

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

Ubuntu 22.04 LTS:
linux-image-5.17.0-1015-oem 5.17.0-1015.16
linux-image-oem-22.04 5.17.0.1015.14
linux-image-oem-22.04a 5.17.0.1015.14

Ubuntu 20.04 LTS:
linux-image-5.14.0-1048-oem 5.14.0-1048.55
linux-image-oem-20.04 5.14.0.1048.44
linux-image-oem-20.04b 5.14.0.1048.44
linux-image-oem-20.04c 5.14.0.1048.44
linux-image-oem-20.04d 5.14.0.1048.44

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-5567-1
CVE-2022-2585, CVE-2022-2586, CVE-2022-2588

Package Information:
https://launchpad.net/ubuntu/+source/linux-oem-5.17/5.17.0-1015.16
https://launchpad.net/ubuntu/+source/linux-oem-5.14/5.14.0-1048.55