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OpenAdvisories
Unscored USN-6168-2 1 CVE

libx11 vulnerability

Published Jun 20, 2023 · Updated Jun 29, 2026

Summary

USN-6168-1 fixed a vulnerability in libx11. This update provides
the corresponding update for Ubuntu 14.04 ESM, Ubuntu 16.04 ESM,
and Ubuntu 18.04 ESM.

Original advisory 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.

Fixed packages 3

ReleasePackageFixed in
Ubuntu · Pro 14.04 LTS Pro:14.04:LTS libx11 2:1.6.2-1ubuntu2.1+esm3
Ubuntu · Pro 16.04 LTS Pro:16.04:LTS libx11 2:1.6.3-1ubuntu2.2+esm2
Ubuntu · Pro 18.04 LTS Pro:18.04:LTS libx11 2:1.6.4-3ubuntu0.4+esm1

Vulnerabilities 1

References

  • report
    https://ubuntu.com/security/CVE-2023-3138