A xorg-server security update has been released for Debian GNU/Linux 11 to address several vulnerabilities that may result in privilege escalation if the X server is running privileged.

DSA 5304-1: xorg-server security update

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Debian Security Advisory DSA-5304-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
December 20, 2022   https://www.debian.org/security/faq
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Package : xorg-server
CVE ID : CVE-2022-4283 CVE-2022-46340 CVE-2022-46341 CVE-2022-46342
CVE-2022-46343 CVE-2022-46344
Debian Bug : 1026071

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

For the stable distribution (bullseye), these problems have been fixed in
version 2:1.20.11-1+deb11u4.

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/xorg-server

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