Advisory Published

USN-5193-1: X.Org X Server vulnerabilities

First published: Tue Dec 14 2021(Updated: )

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled certain inputs. An attacker could use this issue to cause the server to crash, resulting in a denial of service, or possibly execute arbitrary code and escalate privileges.

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/xserver-xorg-core<2:1.20.13-1ubuntu1.1
2:1.20.13-1ubuntu1.1
=21.10
All of
ubuntu/xwayland<2:21.1.2-0ubuntu1.1
2:21.1.2-0ubuntu1.1
=21.10
All of
ubuntu/xserver-xorg-core<2:1.20.11-1ubuntu1.2
2:1.20.11-1ubuntu1.2
=21.04
All of
ubuntu/xwayland<2:21.1.1-0ubuntu1.1
2:21.1.1-0ubuntu1.1
=21.04
All of
ubuntu/xserver-xorg-core<2:1.20.13-1ubuntu1~20.04.2
2:1.20.13-1ubuntu1~20.04.2
=20.04
All of
ubuntu/xserver-xorg-core<2:1.19.6-1ubuntu4.10
2:1.19.6-1ubuntu4.10
=18.04
All of
ubuntu/xserver-xorg-core-hwe-18.04<2:1.20.8-2ubuntu2.2~18.04.6
2:1.20.8-2ubuntu2.2~18.04.6
=18.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID for the X.Org X Server vulnerability?

    The vulnerability ID is CVE-2021-4008, CVE-2021-4010, and CVE-2021-4011.

  • What is the severity of the X.Org X Server vulnerability?

    The severity of the vulnerability is not specified.

  • How does the X.Org X Server vulnerability affect Ubuntu?

    The X.Org X Server vulnerability affects Ubuntu versions 21.10, 21.04, 20.04, and 18.04.

  • How can an attacker exploit the X.Org X Server vulnerability?

    An attacker can exploit the X.Org X Server vulnerability to cause a denial of service or execute arbitrary code.

  • What is the remedy for the X.Org X Server vulnerability?

    The remedy for the X.Org X Server vulnerability is to update the affected packages to the specified versions.

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