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Security Advisory

USN-5612-1: Intel Microcode vulnerability


USN-5612-1: Intel Microcode vulnerability




Canonical Ubuntu

Versions Affected

  • Canonical Ubuntu 18.04


Pietro Borrello, Andreas Kogler, Martin Schwarzl, Daniel Gruss, Michael Schwarz and Moritz Lipp discovered that some Intel processors did not properly clear data between subsequent xAPIC MMIO reads. This could allow a local attacker to compromise SGX enclaves. Update Instructions: Run `sudo ua fix USN-5612-1` to fix the vulnerability. The problem can be corrected by updating your system to the following package versions: intel-microcode – 3.20220809.0ubuntu0.20.04.1 No subscription required

CVEs contained in this USN include: CVE-2022-21233.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

  • Bionic Stemcells
    • 1.x versions prior to 1.107
    • All other stemcells not listed.
  • CF Deployment
    • All versions with Bionic Stemcells prior to 1.107


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

The Cloud Foundry project recommends upgrading the following releases:

  • Bionic Stemcells
    • Upgrade 1.x versions to 1.107 or greater
    • All other stemcells should be upgraded to the latest version available on
  • CF Deployment
    • For all versions, upgrade Bionic Stemcells to 1.107 or greater


2022-09-22: Initial vulnerability report published.

Cloud Foundry Foundation Security Team Profile Image

Cloud Foundry Foundation Security Team, AUTHOR