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Security Advisory

USN-6286-1: Intel Microcode vulnerabilities

USN-6286-1: Intel Microcode vulnerabilities




Canonical Ubuntu

Versions Affected

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


Daniel Moghimi discovered that some Intel(R) Processors did not properly clear microarchitectural state after speculative execution of various instructions. A local unprivileged user could use this to obtain to sensitive information. (CVE-2022-40982) It was discovered that some Intel(R) Xeon(R) Processors did not properly restrict error injection for Intel(R) SGX or Intel(R) TDX. A local privileged user could use this to further escalate their privileges. (CVE-2022-41804) It was discovered that some 3rd Generation Intel(R) Xeon(R) Scalable processors did not properly restrict access in some situations. A local privileged attacker could use this to obtain sensitive information. (CVE-2023-23908) Update Instructions: Run `sudo pro fix USN-6286-1` to fix the vulnerability. The problem can be corrected by updating your system to the following package versions: intel-microcode – 3.20230808.0ubuntu0.16.04.1+esm1 Available with Ubuntu Pro (Infra-only):

CVEs contained in this USN include: CVE-2022-40982, CVE-2022-41804, CVE-2023-23908.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

  • Jammy Stemcells
    • 1.x versions prior to 1.207
    • All other stemcells not listed.
  • CF Deployment
    • All versions with Jammy Stemcells prior to 1.207


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

The Cloud Foundry project recommends upgrading the following releases:

  • Jammy Stemcells
    • Upgrade 1.x versions to 1.207 or greater
    • All other stemcells should be upgraded to the latest version available on
  • CF Deployment
    • For all versions, upgrade Jammy Stemcells to 1.207 or greater


2023-10-05: Initial vulnerability report published.

Cloud Foundry Foundation Security Team Profile Image

Cloud Foundry Foundation Security Team, AUTHOR