Debian LTS: xorg-server Important Privilege Escalation Threat DLA-4353-1

Jan-Niklas Sohn discovered several vulnerabilities in the Xorg X server,
which may result in privilege escalation if the X server is running
privileged.


For Debian 11 bullseye, these problems have been fixed in version
2:1.20.4-1+deb10u18.

We recommend that you upgrade your xorg-server packages.

For the detailed security status of xorg-server please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/xorg-server

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS