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-5778-1: X.Org X Server vulnerabilities

==========================================================================
Ubuntu Security Notice USN-5778-1
December 14, 2022

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

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:

Several security issues were fixed in X.Org X Server.

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 X.Org X Server extensions contained
multiple security issues. 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 2:21.1.4-2ubuntu1.3
xwayland 2:22.1.3-2ubuntu0.2

Ubuntu 22.04 LTS:
xserver-xorg-core 2:21.1.3-2ubuntu2.5
xwayland 2:22.1.1-1ubuntu0.4

Ubuntu 20.04 LTS:
xserver-xorg-core 2:1.20.13-1ubuntu1~20.04.5
xwayland 2:1.20.13-1ubuntu1~20.04.5

Ubuntu 18.04 LTS:
xserver-xorg-core 2:1.19.6-1ubuntu4.13
xserver-xorg-core-hwe-18.04 2:1.20.8-2ubuntu2.2~18.04.9
xwayland 2:1.19.6-1ubuntu4.13
xwayland-hwe-18.04 2:1.20.8-2ubuntu2.2~18.04.9

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

References:
https://ubuntu.com/security/notices/USN-5778-1
CVE-2022-4283, CVE-2022-46340, CVE-2022-46341, CVE-2022-46342,
CVE-2022-46343, CVE-2022-46344

Package Information:
https://launchpad.net/ubuntu/+source/xorg-server/2:21.1.4-2ubuntu1.3
https://launchpad.net/ubuntu/+source/xwayland/2:22.1.3-2ubuntu0.2
https://launchpad.net/ubuntu/+source/xorg-server/2:21.1.3-2ubuntu2.5
https://launchpad.net/ubuntu/+source/xwayland/2:22.1.1-1ubuntu0.4
https://launchpad.net/ubuntu/+source/xorg-server/2:1.20.13-1ubuntu1~20.04.5
https://launchpad.net/ubuntu/+source/xorg-server/2:1.19.6-1ubuntu4.13

https://launchpad.net/ubuntu/+source/xorg-server-hwe-18.04/2:1.20.8-2ubuntu2.2~18.04.9