# CVE-2021-26316: Memory corruption in 1st Gen EPYC

> An attacker can execute arbitrary code in System Management Mode by tampering with the BIOS communication buffer.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 10 Jan 2023
- **Updated:** 9 Apr 2025
- **Also known as:** GHSA-hr2h-gpm8-8hqc

## What is CVE-2021-26316?

CVE-2021-26316 is a high-severity memory corruption vulnerability in Amd Epyc 7232p Firmware, published on 10 Jan 2023. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Failure to validate the communication buffer and communication service in the BIOS may allow an attacker to tamper with the buffer resulting in potential SMM (System Management Mode) arbitrary code execution.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2021-26316?

It affects 147 products.


Products: Amd Athlon 3050ge Firmware, Amd Athlon 3150g Firmware, Amd Athlon 3150ge Firmware, Amd Athlon Gold 3150c Firmware, Amd Athlon Gold 3150ge Firmware, Amd Athlon Gold 3150u Firmware, Amd Athlon Gold Pro 3150g Firmware, Amd Athlon Gold Pro 3150ge Firmware, Amd Athlon Pro 3045b Firmware, Amd Athlon Pro 3145b Firmware, Amd Athlon Silver 3050c Firmware, Amd Athlon Silver 3050e Firmware, Amd Athlon Silver 3050ge Firmware, Amd Athlon Silver 3050u Firmware, Amd Athlon Silver Pro 3125ge Firmware, Amd Epyc 7002 Firmware, Amd Epyc 7003 Firmware, Amd Epyc 7232p Firmware, Amd Epyc 7252 Firmware, Amd Epyc 7262 Firmware and 127 more.

## How do I fix CVE-2021-26316?

No fix has been published for CVE-2021-26316 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-26316 being exploited?

There is no known exploitation of CVE-2021-26316 in the wild and no public exploit code.

## Other vulnerabilities in Amd Epyc 7232p Firmware

- [CVE-2021-26317](https://insights.sbomify.com/CVE-2021-26317/): Security feature bypass in Athlon™ Series (high 7.8)
- [CVE-2021-26369](https://insights.sbomify.com/CVE-2021-26369/): Memory corruption in Athlon™ Series (high 7.8)
- [CVE-2020-12965](https://insights.sbomify.com/CVE-2020-12965/): Information disclosure in All supported processors (high 7.5)
- [CVE-2021-26362](https://insights.sbomify.com/CVE-2021-26362/): Privilege escalation in Athlon™ Series (high 7.1)
- [CVE-2021-26366](https://insights.sbomify.com/CVE-2021-26366/): Information disclosure in Athlon™ Series (high 7.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-26316 and fix it if it is affected.

What it is: CVE-2021-26316 is a high-severity memory corruption vulnerability in Amd Epyc 7232p Firmware, published on 10 Jan 2023. 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-2021-26316 in the wild and no public exploit code.

Affected product: Amd Epyc 7232p Firmware. 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-2021-26316/ (Markdown: https://insights.sbomify.com/CVE-2021-26316/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-26316
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-26316
- OSV: https://osv.dev/vulnerability/CVE-2021-26316

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-26316/
Summaries are generated and may contain mistakes; the official description above is the record.