[USN-7848-1] AMD Microcode vulnerabilities

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Ubuntu Security Notice USN-7848-1
October 29, 2025

amd64-microcode vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 25.04

Summary:

Several security issues were fixed in AMD Microcode.

Software Description:
- amd64-microcode: Platform firmware and microcode for AMD CPUs and SoCs

Details:

Oleksii Oleksenko, Cedric Fournet, Jana Hofmann, Boris Köpf, Stavros Volos,
and Flavien Solt discovered that some AMD processors may allow an attacker
to infer data from previous stores. A local attacker could possibly use
this issue to expose sensitive information. This update provides the
updated microcode mitigations required for the corresponding Linux kernel
update.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 25.04
amd64-microcode 3.20250708.0ubuntu0.25.04.2

After a standard system update you need to reboot your computer to make all
the necessary changes.

References:
https://ubuntu.com/security/notices/USN-7848-1
CVE-2024-36350, CVE-2024-36357

Package Information:
https://launchpad.net/ubuntu/+source/amd64-microcode/3.20250708.0ubuntu0.25.04.2