A X.Org X Server security update has been released for Gentoo Linux.

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Gentoo Linux Security Advisory GLSA 202104-02
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  https://security.gentoo.org/
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Severity: High
Title: X.Org X Server: Privilege escalation
Date: April 30, 2021
Bugs: #782679
ID: 202104-02

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Synopsis
========

A vulnerability in X.Org X Server may allow users to escalate
privileges.

Background
==========

The X Window System is a graphical windowing system based on a
client/server model.

Affected packages
=================

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Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 x11-base/xorg-server < 1.20.11 >= 1.20.11

Description
===========

It was discovered that X.Org X Server did not sufficiently check the
length of the XInput extension's ChangeFeedbackControl request.

Impact
======

An authorized attacker could possibly escalate privileges, or cause a
Denial of Service condition.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All X.Org X Server users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=x11-base/xorg-server-1.20.11"

References
==========

[ 1 ] CVE-2021-3472
  https://nvd.nist.gov/vuln/detail/CVE-2021-3472

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  https://security.gentoo.org/glsa/202104-02

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
  https://bugs.gentoo.org.

License
=======

Copyright 2021 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

  https://creativecommons.org/licenses/by-sa/2.5