A xorg-server security update has been released for Debian GNU/Linux 10 LTS to address a use-after-free flaw.

DLA 3372-1: xorg-server security update

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Debian LTS Advisory DLA-3372-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Thorsten Alteholz
March 29, 2023   https://wiki.debian.org/LTS
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Package : xorg-server
Version : 2:1.20.4-1+deb10u9
CVE ID : CVE-2023-1393

Jan-Niklas Sohn discovered that a use-after-free flaw in the Composite
extension of the X.org X server may result in privilege escalation if
the X server is running under the root user.

For Debian 10 buster, this problem has been fixed in version
2:1.20.4-1+deb10u9.

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