[USN-7561-1] AMD Microcode vulnerabilities

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Ubuntu Security Notice USN-7561-1
June 09, 2025

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

- Ubuntu 24.10
- Ubuntu 24.04 LTS

Summary:

Several security issues were fixed in AMD Microcode.

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

Details:

It was discovered that AMD Microcode incorrectly handled memory addresses.
An attacker with local administrator privilege could possibly use this
issue to cause loss of integrity of a confidential guest running under AMD
SEV-SNP. (CVE-2023-20584, CVE-2023-31356)

Josh Eads, Kristoffer Janke, Eduardo Nava, Tavis Ormandy and Matteo Rizzo
discovered that AMD Microcode incorrectly verified signatures. An attacker
with local administrator privilege could possibly use this issue to cause
loss of confidentiality and integrity of a confidential guest running under
AMD SEV-SNP. (CVE-2024-56161)

Update instructions:

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

Ubuntu 24.10
amd64-microcode 3.20250311.1ubuntu0.24.10.1

Ubuntu 24.04 LTS
amd64-microcode 3.20250311.1ubuntu0.24.04.1

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

References:
https://ubuntu.com/security/notices/USN-7561-1
CVE-2023-20584, CVE-2023-31356, CVE-2024-56161

Package Information:
https://launchpad.net/ubuntu/+source/amd64-microcode/3.20250311.1ubuntu0.24.10.1
https://launchpad.net/ubuntu/+source/amd64-microcode/3.20250311.1ubuntu0.24.04.1