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

USN-5590-1: Linux kernel (OEM) vulnerability

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Ubuntu Security Notice USN-5590-1
August 30, 2022

linux-oem-5.14 vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS

Summary:

The system could be made to crash if it received specially crafted
network traffic.

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

Details:

Domingo Dirutigliano and Nicola Guerrera discovered that the netfilter
subsystem in the Linux kernel did not properly handle rules that truncated
packets below the packet header size. When such rules are in place, a
remote attacker could possibly use this to cause a denial of service
(system crash).

Update instructions:

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

Ubuntu 20.04 LTS:
linux-image-5.14.0-1050-oem 5.14.0-1050.57
linux-image-oem-20.04 5.14.0.1050.46
linux-image-oem-20.04b 5.14.0.1050.46
linux-image-oem-20.04c 5.14.0.1050.46
linux-image-oem-20.04d 5.14.0.1050.46

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-5590-1
CVE-2022-36946

Package Information:
  https://launchpad.net/ubuntu/+source/linux-oem-5.14/5.14.0-1050.57