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

USN-5493-2: Linux kernel (HWE) vulnerability

=========================================================================
Ubuntu Security Notice USN-5493-2
July 01, 2022

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

- Ubuntu 20.04 LTS

Summary:

The system could be made to crash under certain conditions.

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

Details:

It was discovered that the 8 Devices USB2CAN interface implementation in
the Linux kernel did not properly handle certain error conditions, leading
to a double-free. A local 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-5.13.0-52-generic 5.13.0-52.59~20.04.1
linux-image-5.13.0-52-generic-64k 5.13.0-52.59~20.04.1
linux-image-5.13.0-52-generic-lpae 5.13.0-52.59~20.04.1
linux-image-5.13.0-52-lowlatency 5.13.0-52.59~20.04.1
linux-image-generic-64k-hwe-20.04 5.13.0.52.59~20.04.31
linux-image-generic-hwe-20.04 5.13.0.52.59~20.04.31
linux-image-generic-lpae-hwe-20.04 5.13.0.52.59~20.04.31
linux-image-lowlatency-hwe-20.04 5.13.0.52.59~20.04.31
linux-image-virtual-hwe-20.04 5.13.0.52.59~20.04.31

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-5493-2
  https://ubuntu.com/security/notices/USN-5493-1
CVE-2022-28388

Package Information:
  https://launchpad.net/ubuntu/+source/linux-hwe-5.13/5.13.0-52.59~20.04.1