A xorg-server security update has been released for Debian GNU/Linux 10 to address missing input sanitising in the XInput extension of the X.org X server may result in privilege escalation if the X server is running privileged.

DSA 4893-1: xorg-server security update

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Debian Security Advisory DSA-4893-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
April 19, 2021   https://www.debian.org/security/faq
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Package : xorg-server
CVE ID : CVE-2021-3472

Jan-Niklas Sohn discovered that missing input sanitising in the XInput
extension of the X.org X server may result in privilege escalation if
the X server is running privileged.

For the stable distribution (buster), this problem has been fixed in
version 2:1.20.4-1+deb10u3.

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/