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Security Advisory

USN-4627-1: Linux kernel vulnerability




Canonical Ubuntu

Versions Affected

  • Canonical Ubuntu 14.04
  • Canonical Ubuntu 16.04


Moritz Lipp, Michael Schwarz, Andreas Kogler, David Oswald, Catherine Easdon, Claudio Canella, and Daniel Gruss discovered that the Intel Running Average Power Limit (RAPL) driver in the Linux kernel did not properly restrict access to power data. A local attacker could possibly use this to expose sensitive information.

CVEs contained in this USN include: CVE-2020-8694.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

  • Xenial Stemcells
    • 315.x versions prior to 315.202
    • 456.x versions prior to 456.129
    • 621.x versions prior to 621.93
    • All other stemcells not listed.


Users of affected products are strongly encouraged to follow the mitigations below. The Cloud Foundry project recommends upgrading the following releases:

  • Xenial Stemcells
    • Upgrade 315.x versions to 315.202 or greater
    • Upgrade 456.x versions to 456.129 or greater
    • Upgrade 621.x versions to 621.93 or greater
    • All other stemcells should be upgraded to the latest version available on


2020-12-11: Initial vulnerability report published.

Cloud Foundry Foundation Security Team Profile Image

Cloud Foundry Foundation Security Team, AUTHOR