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Security Advisory

USN-3522-4: Linux kernel (Xenial HWE) regression

USN-3522-4: Linux kernel (Xenial HWE) regression




Canonical Ubuntu

Versions Affected

  • Canonical Ubuntu 14.04


USN-3522-2 fixed a vulnerability in the Linux Hardware Enablement kernel for Ubuntu 14.04 LTS to address Meltdown (CVE-2017-5754). Unfortunately, that update introduced a regression where a few systems failed to boot successfully. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

Jann Horn discovered that microprocessors utilizing speculative execution and indirect branch prediction may allow unauthorized memory reads via sidechannel attacks. This flaw is known as Meltdown. A local attacker could use this to expose sensitive information, including kernel memory.

Affected Cloud Foundry Products and Versions

Severity is critical unless otherwise noted.

  • Cloud Foundry BOSH stemcells are vulnerable, including:
    • 3312.x versions prior to 3312.49
    • 3363.x versions prior to 3363.45
    • 3421.x versions prior to 3421.35
    • 3445.x versions prior to 3445.21
    • 3468.x versions prior to 3468.16
    • All other stemcells not listed.


OSS users are strongly encouraged to follow one of the mitigations below:

  • The Cloud Foundry project recommends upgrading the following BOSH stemcells:
    • Upgrade 3312.x versions to 3312.49
    • Upgrade 3363.x versions to 3363.45
    • Upgrade 3421.x versions to 3421.35
    • Upgrade 3445.x versions to 3445.21
    • Upgrade 3468.x versions to 3468.16
    • All other stemcells should be upgraded to the latest version available on


Cloud Foundry Foundation Security Team Profile Image

Cloud Foundry Foundation Security Team, AUTHOR