A xorg-server security update has been released for Debian GNU/Linux 9 LTS to address an incomplete input validation, which could result in privilege escalation.

DLA 2486-1: xorg-server security update

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Debian LTS Advisory DLA-2486-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Emilio Pozuelo Monfort
December 09, 2020   https://wiki.debian.org/LTS
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Package : xorg-server
Version : 2:1.19.2-1+deb9u7
CVE ID : CVE-2020-14360 CVE-2020-25712

Jan-Niklas Sohn discovered that the XKB extension of the Xorg X server
performed incomplete input validation, which could result in privilege
escalation.

For Debian 9 stretch, these problems have been fixed in version
2:1.19.2-1+deb9u7.

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