The problem can be corrected by updating your system to the following package versions: Ubuntu 14.04 ESM: xserver-xorg-core 2:1.15.1-0ubuntu2.11+esm4 After a standard system update you need to reboot your computer to make all the necessary changes.
https://ubuntu.com/security/notices/USN-4905-2
https://ubuntu.com/security/notices/USN-4905-1
CVE-2021-3472
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