1. Ubuntu Security Notices
  2. USN-6168-1

USN-6168-1: libx11 vulnerability

Publication date

15 June 2023

Overview

libx11 could be made to crash if it received specially crafted network traffic.

Releases

Packages

  • libx11 - X11 client-side library

Details

Gregory James Duck discovered that libx11 incorrectly handled certain
Request, Event, or Error IDs. If a user were tricked into connecting to a
malicious X Server, a remote attacker could possibly use this issue to
cause libx11 to crash, resulting in a denial of service.

Gregory James Duck discovered that libx11 incorrectly handled certain
Request, Event, or Error IDs. If a user were tricked into connecting to a
malicious X Server, a remote attacker could possibly use this issue to
cause libx11 to crash, resulting in a denial of service.

Update instructions

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

The problem can be corrected by updating your system to the following package versions:

Ubuntu Release Package Version
23.04 lunar libx11-6 –  2:1.8.4-2ubuntu0.2
22.10 kinetic libx11-6 –  2:1.8.1-2ubuntu0.2
22.04 jammy libx11-6 –  2:1.7.5-1ubuntu0.2
20.04 focal libx11-6 –  2:1.6.9-2ubuntu1.5

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Get Ubuntu Pro

References

Have additional questions?

Talk to a member of the team ›