Debian Security Advisory

DLA-3372-1 xorg-server -- LTS security update

Date Reported:
29 Mar 2023
Affected Packages:
Security database references:
In Mitre's CVE dictionary: CVE-2023-1393.
More information:

Jan-Niklas Sohn discovered that a use-after-free flaw in the Composite extension of the 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:

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