[USN-5193-1] X.Org X Server vulnerabilities

========================================================================== Ubuntu Security Notice USN-5193-1 December 14, 2021
xorg-server, xorg-server-hwe-18.04, xwayland vulnerabilities ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 21.10 – Ubuntu 21.04 – 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: 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.
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.
References: ubuntu.com/security/notices/USN-5193-1 CVE-2021-4008, CVE-2021-4009, CVE-2021-4010, CVE-2021-4011
Package Information: launchpad.net/ubuntu/+source/xorg-server/2:1.20.13-1ubuntu1.1 launchpad.net/ubuntu/+source/xwayland/2:21.1.2-0ubuntu1.1 launchpad.net/ubuntu/+source/xorg-server/2:1.20.11-1ubuntu1.2 launchpad.net/ubuntu/+source/xwayland/2:21.1.1-0ubuntu1.1 launchpad.net/ubuntu/+source/xorg-server/2:1.20.13-1ubuntu1~20.04.2 launchpad.net/ubuntu/+source/xorg-server/2:1.19.6-1ubuntu4.10
launchpad.net/ubuntu/+source/xorg-server-hwe-18.04/2:1.20.8-2ubuntu2.2~18.04.6