Advisory Published

USN-6244-1: AMD Microcode vulnerability

First published: Tue Jul 25 2023(Updated: )

Tavis Ormandy discovered that some AMD processors did not properly handle speculative execution of certain vector register instructions. A local attacker could use this to expose sensitive information.

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/amd64-microcode<3.20220411.1ubuntu3.1
3.20220411.1ubuntu3.1
=23.04
All of
ubuntu/amd64-microcode<3.20191218.1ubuntu2.1
3.20191218.1ubuntu2.1
=22.04
All of
ubuntu/amd64-microcode<3.20191218.1ubuntu1.1
3.20191218.1ubuntu1.1
=20.04
All of
ubuntu/amd64-microcode<3.20191021.1+really3.20181128.1~ubuntu0.18.04.1+esm1
3.20191021.1+really3.20181128.1~ubuntu0.18.04.1+esm1
=18.04
All of
ubuntu/amd64-microcode<3.20191021.1+really3.20180524.1~ubuntu0.16.04.2+esm1
3.20191021.1+really3.20180524.1~ubuntu0.16.04.2+esm1
=16.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is USN-6244-1?

    USN-6244-1 is a security vulnerability in AMD microcode that could allow a local attacker to expose sensitive information.

  • How does the AMD Microcode vulnerability work?

    The AMD Microcode vulnerability occurs when certain vector register instructions are not properly handled during speculative execution, allowing a local attacker to expose sensitive information.

  • Which systems are affected by the AMD Microcode vulnerability?

    Systems running Ubuntu 23.04, 22.04, 20.04, 18.04, and 16.04 with specific versions of the amd64-microcode package are affected by the AMD Microcode vulnerability.

  • How can I fix the AMD Microcode vulnerability?

    To fix the AMD Microcode vulnerability, update the amd64-microcode package to version 3.20220411.1ubuntu3.1 (for Ubuntu 23.04), 3.20191218.1ubuntu2.1 (for Ubuntu 22.04), 3.20191218.1ubuntu1.1 (for Ubuntu 20.04), 3.20191021.1+really3.20181128.1~ubuntu0.18.04.1+esm1 (for Ubuntu 18.04), or 3.20191021.1+really3.20180524.1~ubuntu0.16.04.2+esm1 (for Ubuntu 16.04).

  • Where can I find more information about the AMD Microcode vulnerability?

    More information about the AMD Microcode vulnerability can be found at the following references: USN-6315-1, USN-6316-1, and CVE-2023-20593.

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