X.Org X Server: Privilege escalation — GLSA 202104-02

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

Package	x11-base/xorg-server on all architectures
Affected versions	< 1.20.11
Unaffected versions	>= 1.20.11

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

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

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

There is no known workaround at this time.

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"

Release date
April 30, 2021

Latest revision
April 30, 2021: 1

Severity
high

Exploitable
local, remote

Bugzilla entries