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Security Advisory

USN-6541-1: GNU C Library vulnerabilities

USN-6541-1: GNU C Library vulnerabilities




Canonical Ubuntu

Versions Affected

  • Canonical Ubuntu 16.04
  • Canonical Ubuntu 18.04
  • Canonical Ubuntu 22.04


It was discovered that the GNU C Library was not properly handling certain memory operations. An attacker could possibly use this issue to cause a denial of service (application crash). (CVE-2023-4806, CVE-2023-4813) It was discovered that the GNU C library was not properly implementing a fix for CVE-2023-4806 in certain cases, which could lead to a memory leak. An attacker could possibly use this issue to cause a denial of service (application crash). This issue only affected Ubuntu 22.04 LTS and Ubuntu 23.04. (CVE-2023-5156) Update Instructions: Run `sudo pro fix USN-6541-1` to fix the vulnerability. The problem can be corrected by updating your system to the following package versions: libc-bin – 2.35-0ubuntu3.5 glibc-doc – 2.35-0ubuntu3.5 locales-all – 2.35-0ubuntu3.5 libc6-i386 – 2.35-0ubuntu3.5 libc6-s390 – 2.35-0ubuntu3.5 libc6-dev-i386 – 2.35-0ubuntu3.5 nscd – 2.35-0ubuntu3.5 libc6-dev-x32 – 2.35-0ubuntu3.5 libc6-dev – 2.35-0ubuntu3.5 libc6-amd64 – 2.35-0ubuntu3.5 libc6-x32 – 2.35-0ubuntu3.5 libc6-dev-amd64 – 2.35-0ubuntu3.5 libc-dev-bin – 2.35-0ubuntu3.5 libc6 – 2.35-0ubuntu3.5 libc6-prof – 2.35-0ubuntu3.5 libc-devtools – 2.35-0ubuntu3.5 glibc-source – 2.35-0ubuntu3.5 libc6-dev-s390 – 2.35-0ubuntu3.5 locales – 2.35-0ubuntu3.5 No subscription required

CVEs contained in this USN include: CVE-2023-4806, CVE-2023-4813, CVE-2023-5156.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

  • cflinuxfs4
    • All versions prior to 1.58.0
  • Jammy Stemcells
    • 1.x versions prior to 1.327
    • All other stemcells not listed.
  • CF Deployment
    • All versions prior to 30.0.0, or later versions with Jammy Stemcells prior to 1.327


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 1.58.0 or greater
  • Jammy Stemcells
    • Upgrade 1.x versions to 1.327 or greater
    • All other stemcells should be upgraded to the latest version available on
  • CF Deployment
    • Upgrade all versions to 30.0.0 or greater and upgrade Jammy Stemcells to 1.327 or greater


2024-04-04: Initial vulnerability report published.

Cloud Foundry Foundation Security Team Profile Image

Cloud Foundry Foundation Security Team, AUTHOR