Advisory Published

USN-6319-1: AMD Microcode vulnerability

First published: Wed Aug 30 2023(Updated: )

Daniël Trujillo, Johannes Wikner, and Kaveh Razavi discovered that some AMD processors utilising speculative execution and branch prediction may allow unauthorised memory reads via a speculative side-channel attack. A local attacker could use this to expose sensitive information, including kernel memory.

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/amd64-microcode<3.20220411.1ubuntu3.2
3.20220411.1ubuntu3.2
=23.04
All of
ubuntu/amd64-microcode<3.20191218.1ubuntu2.2
3.20191218.1ubuntu2.2
=22.04
All of
ubuntu/amd64-microcode<3.20191218.1ubuntu1.2
3.20191218.1ubuntu1.2
=20.04
All of
ubuntu/amd64-microcode<3.20191021.1+really3.20181128.1~ubuntu0.18.04.1+esm2
3.20191021.1+really3.20181128.1~ubuntu0.18.04.1+esm2
=18.04
All of
ubuntu/amd64-microcode<3.20191021.1+really3.20180524.1~ubuntu0.16.04.2+esm2
3.20191021.1+really3.20180524.1~ubuntu0.16.04.2+esm2
=16.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of USN-6319-1?

    The severity of USN-6319-1 is high.

  • How does the AMD Microcode vulnerability affect Ubuntu 23.04?

    Ubuntu 23.04 is affected by the AMD Microcode vulnerability.

  • How can a local attacker exploit this vulnerability?

    A local attacker can exploit this vulnerability by conducting a speculative side-channel attack to expose sensitive information, including kernel memory.

  • What is the remedy for the AMD Microcode vulnerability in Ubuntu 18.04?

    The remedy for the AMD Microcode vulnerability in Ubuntu 18.04 is version 3.20191021.1+really3.20180524.1~ubuntu0.16.04.2+esm2 of the amd64-microcode package.

  • Where can I find more information about USN-6319-1?

    You can find more information about USN-6319-1 on the Ubuntu Security website.

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