CVE-2025-0033

Publication date 14 October 2025

Last updated 12 December 2025

Ubuntu priority

Cvss 3 Severity Score

Description

Improper access control within AMD SEV-SNP could allow an admin privileged attacker to write to the RMP during SNP initialization, potentially resulting in a loss of SEV-SNP guest memory integrity.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
amd64-microcode	26.04 LTS resolute	Needs evaluation
	25.10 questing	Needs evaluation
	25.04 plucky	Ignored end of life, was needs-triage
	24.04 LTS noble	Needs evaluation
	22.04 LTS jammy	Needs evaluation
	20.04 LTS focal	Needs evaluation
	18.04 LTS bionic	Needs evaluation
	16.04 LTS xenial	Needs evaluation
	14.04 LTS trusty	Ignored no real-world users

Notes

rodrigo-zaiden

AMD SB mentions fix in both SEV (amd/) and ucode (amd-ucode/) binaries. didn't find matches in upstream for SEV binaries but ucode versions found in upstream version: 2025-07-29 This is not planned to be fixed for the amd64-microcode package in Ubuntu 14.04 as that release was already outside of the LTS timeframe when this hardware platform was launched.

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=376

Severity score breakdown

CVSS version: CVSS v3.0

Base score 6.0 · Medium

Base metrics

Parameter	Value
Attack vector	Local
Attack complexity	Low
Privileges required	High
User interaction	None
Scope	Changed
Confidentiality impact	None
Integrity impact	High
Availability impact	None

Scores

Parameter	Value
Base score	6.0 · Medium
Exploitability score	-
Impact score	-

Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:N