CVE-2023-31356

Publication date 13 August 2024

Last updated 26 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

Incomplete system memory cleanup in SEV firmware could allow a privileged attacker to corrupt guest private memory, potentially resulting in a loss of data integrity.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
amd64-microcode	25.04 plucky	Not affected
	24.10 oracular	Fixed 3.20250311.1ubuntu0.24.10.1
	24.04 LTS noble	Fixed 3.20250311.1ubuntu0.24.04.1
	22.04 LTS jammy	Not affected
	20.04 LTS focal	Not affected
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected

Notes

rodrigo-zaiden

AMD SEV firmware were included in noble onwards, based on upstream release 20220411, releases older than that are not supported.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
amd64-microcode	Upstream: ?id=ace

Severity score breakdown

Parameter	Value
Base score	4.4 · Medium
Attack vector	Local
Attack complexity	Low
Privileges required	High
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	High
Availability impact	None
Vector	CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N

References

Related Ubuntu Security Notices (USN)

USN-7561-1
AMD Microcode vulnerabilities
9 June 2025