Ubuntu 21.10 USN-5193-1 Critical: X.Org X Server Denial Of Service

ubuntu

December 14, 2021

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

Summary

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

Software Description:

- xorg-server: X.Org X11 server

- xwayland: Xwayland X server

- xorg-server-hwe-18.04: X.Org X11 server

Details:

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled

certain inputs. An attacker could use this issue to cause the server to

crash, resulting in a denial of service, or possibly execute arbitrary

code and escalate privileges.

Topics Covered

security advisory denial of service critical software update Ubuntu Xwayland X.Org X Server

Update Instructions

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

Ubuntu 21.10:
  xserver-xorg-core               2:1.20.13-1ubuntu1.1
  xwayland                        2:21.1.2-0ubuntu1.1

Ubuntu 21.04:
  xserver-xorg-core               2:1.20.11-1ubuntu1.2
  xwayland                        2:21.1.1-0ubuntu1.1

Ubuntu 20.04 LTS:
  xserver-xorg-core               2:1.20.13-1ubuntu1~20.04.2

Ubuntu 18.04 LTS:
  xserver-xorg-core               2:1.19.6-1ubuntu4.10
  xserver-xorg-core-hwe-18.04     2:1.20.8-2ubuntu2.2~18.04.6

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