Improper Lock Bit Modification Vulnerability in SEV Firmware by AMD
CVE-2025-52536

6.7MEDIUM

Key Information:

Vendor

Amd
Status
Amd Epyc™ 9004 Series Processors
Amd Epyc™ 7003 Series Processors
Amd Epyc™ 9005 Series Processors
Amd Epyc™ 8004 Series Processors
Vendor
CVE Published:
10 February 2026

What is CVE-2025-52536?

The SEV firmware from AMD is susceptible to a vulnerability that permits unauthorized modification of lock bits. This flaw facilitates privileged attackers to potentially downgrade the firmware version, which can compromise the integrity of the system. Such a modification can lead to serious security implications, allowing malicious entities to exploit the system and access sensitive data.

Affected Version(s)

AMD EPYC™ 7003 Series Processors MilanPI 1.0.0.H

AMD EPYC™ 8004 Series Processors GenoaPI 1.0.0.G

AMD EPYC™ 9004 Series Processors GenoaPI 1.0.0.G

References

https://www.amd.com/en/resources/product-security/bulleti...

CVSS V4

Score:
6.7
Severity:
MEDIUM
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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