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Security Advisory

USN-6168-1: libx11 vulnerability

USN-6168-1: libx11 vulnerability




Canonical Ubuntu

Versions Affected

  • Canonical Ubuntu 22.04


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: Run `sudo pro fix USN-6168-1` to fix the vulnerability. The problem can be corrected by updating your system to the following package versions: libx11-6 – 2:1.6.9-2ubuntu1.5 libx11-data – 2:1.6.9-2ubuntu1.5 libx11-xcb-dev – 2:1.6.9-2ubuntu1.5 libx11-xcb1 – 2:1.6.9-2ubuntu1.5 libx11-doc – 2:1.6.9-2ubuntu1.5 libx11-dev – 2:1.6.9-2ubuntu1.5 No subscription required

CVEs contained in this USN include: CVE-2023-3138.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

  • cflinuxfs4
    • All versions prior to 1.20.0
  • CF Deployment
    • All versions prior to 30.6.0


Users of affected products are strongly encouraged to follow the mitigations below.

The Cloud Foundry project recommends upgrading the following releases:

  • cflinuxfs4
    • Upgrade all versions to 1.20.0 or greater
  • CF Deployment
    • Upgrade all versions to 30.6.0 or greater


2023-06-29: Initial vulnerability report published.

Cloud Foundry Foundation Security Team Profile Image

Cloud Foundry Foundation Security Team, AUTHOR