# CVE-2025-52536: Security feature bypass in AMD EPYC™ 7003 Series Processors

> A privileged attacker can downgrade SEV firmware due to improper lock bit prevention, compromising system integrity on AMD EPYC processors.

- **Severity:** Medium 6.7 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 10 Feb 2026
- **Updated:** 10 Feb 2026
- **Also known as:** DEBIAN-CVE-2025-52536, GHSA-546x-462h-qqw8, UBUNTU-CVE-2025-52536

## What is CVE-2025-52536?

CVE-2025-52536 is a medium-severity vulnerability in AMD EPYC™ 7003 Series Processors, published on 10 Feb 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Improper Prevention of Lock Bit Modification in SEV firmware could allow a privileged attacker to downgrade firmware potentially resulting in a loss of integrity.

Weakness: CWE-1231 (Improper Prevention of Lock Bit Modification)

## Which versions are affected by CVE-2025-52536?


## How do I fix CVE-2025-52536?

No fix has been published for CVE-2025-52536 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-52536 being exploited?

There is no known exploitation of CVE-2025-52536 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-52536 and fix it if it is affected.

What it is: CVE-2025-52536 is a medium-severity vulnerability in AMD EPYC™ 7003 Series Processors, published on 10 Feb 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-52536 in the wild and no public exploit code.

Affected product: AMD EPYC™ 7003 Series Processors. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-52536/ (Markdown: https://insights.sbomify.com/CVE-2025-52536/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-52536
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-52536
- OSV: https://osv.dev/vulnerability/CVE-2025-52536

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-52536/
Summaries are generated and may contain mistakes; the official description above is the record.