=========================================================================Ubuntu Security Notice USN-5740-1
November 23, 2022

xorg-server, xorg-server-hwe-16.04, 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
- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

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
- xorg-server-hwe-16.04: X.Org X11 server

Details:

It was discovered that X.Org X Server incorrectly handled certain inputs.
An attacker could use these issues to cause the server to crash, resulting
in a denial of service, or possibly execute arbitrary code.

Update instructions:

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

Ubuntu 22.10:
   xserver-xorg-core               2:21.1.4-2ubuntu1.1
   xwayland                        2:22.1.3-2ubuntu0.1

Ubuntu 22.04 LTS:
   xserver-xorg-core               2:21.1.3-2ubuntu2.3
   xwayland                        2:22.1.1-1ubuntu0.3

Ubuntu 20.04 LTS:
   xserver-xorg-core               2:1.20.13-1ubuntu1~20.04.4
   xwayland                        2:1.20.13-1ubuntu1~20.04.4

Ubuntu 18.04 LTS:
   xserver-xorg-core               2:1.19.6-1ubuntu4.12
   xserver-xorg-core-hwe-18.04     2:1.20.8-2ubuntu2.2~18.04.8
   xwayland                        2:1.19.6-1ubuntu4.12

Ubuntu 16.04 ESM:
   xserver-xorg-core               2:1.18.4-0ubuntu0.12+esm4
   xserver-xorg-core-hwe-16.04     2:1.19.6-1ubuntu4.1~16.04.6+esm3
   xwayland                        2:1.18.4-0ubuntu0.12+esm4

Ubuntu 14.04 ESM:
   xserver-xorg-core               2:1.15.1-0ubuntu2.11+esm6

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

References:
   https://ubuntu.com/security/notices/USN-5740-1
   CVE-2022-3550, CVE-2022-3551

Package Information:
   https://launchpad.net/ubuntu/+source/xorg-server/2:21.1.4-2ubuntu1.1
   https://launchpad.net/ubuntu/+source/xwayland/2:22.1.3-2ubuntu0.1
   https://launchpad.net/ubuntu/+source/xorg-server/2:21.1.3-2ubuntu2.3
   https://launchpad.net/ubuntu/+source/xwayland/2:22.1.1-1ubuntu0.3
   https://launchpad.net/ubuntu/+source/xorg-server/2:1.20.13-1ubuntu1~20.04.4
   https://launchpad.net/ubuntu/+source/xorg-server/2:1.19.6-1ubuntu4.12
 
https://launchpad.net/ubuntu/+source/xorg-server-hwe-18.04/2:1.20.8-2ubuntu2.2~18.04.8