A X.Org X Server security update has been released for Ubuntu Linux 18.04 LTS, 20.04 LTS, 22.04 LTS, and 22.10.

USN-5846-1: X.Org X Server vulnerability

==========================================================================
Ubuntu Security Notice USN-5846-1
February 07, 2023

xorg-server, xorg-server-hwe-18.04, xwayland vulnerability
==========================================================================

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

- Ubuntu 22.10
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

X.Org X Server could be made to crash or run programs as the administrator
if it received specially crafted input.

Software Description:
- xorg-server: X.Org X11 server
- xwayland: X server for running X clients under Wayland
- xorg-server-hwe-18.04: X.Org X11 server

Details:

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled
certain memory operations. An attacker could possibly use these issues to
cause the X Server to crash, execute arbitrary code, or escalate
privileges.

Update instructions:

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

Ubuntu 22.10:
xserver-xorg-core 2:21.1.4-2ubuntu1.5
xwayland 2:22.1.3-2ubuntu0.3

Ubuntu 22.04 LTS:
xserver-xorg-core 2:21.1.3-2ubuntu2.7
xwayland 2:22.1.1-1ubuntu0.5

Ubuntu 20.04 LTS:
xserver-xorg-core 2:1.20.13-1ubuntu1~20.04.6
xwayland 2:1.20.13-1ubuntu1~20.04.6

Ubuntu 18.04 LTS:
xserver-xorg-core 2:1.19.6-1ubuntu4.14
xserver-xorg-core-hwe-18.04 2:1.20.8-2ubuntu2.2~18.04.10
xwayland 2:1.19.6-1ubuntu4.14
xwayland-hwe-18.04 2:1.20.8-2ubuntu2.2~18.04.10

After a standard system update you need to reboot your computer to make all
the necessary changes.

References:
https://ubuntu.com/security/notices/USN-5846-1
CVE-2023-0494

Package Information:
https://launchpad.net/ubuntu/+source/xorg-server/2:21.1.4-2ubuntu1.5
https://launchpad.net/ubuntu/+source/xwayland/2:22.1.3-2ubuntu0.3
https://launchpad.net/ubuntu/+source/xorg-server/2:21.1.3-2ubuntu2.7
https://launchpad.net/ubuntu/+source/xwayland/2:22.1.1-1ubuntu0.5
https://launchpad.net/ubuntu/+source/xorg-server/2:1.20.13-1ubuntu1~20.04.6
https://launchpad.net/ubuntu/+source/xorg-server/2:1.19.6-1ubuntu4.14

https://launchpad.net/ubuntu/+source/xorg-server-hwe-18.04/2:1.20.8-2ubuntu2.2~18.04.10