# CVE-2021-26317: Security feature bypass in Athlon™ Series

> Attackers can bypass SMM protocol verification to modify SPI flash, enabling arbitrary code execution on AMD Athlon and Ryzen processors.

- **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:** 12 May 2022
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-qc86-j87r-2654

## What is CVE-2021-26317?

CVE-2021-26317 is a high-severity vulnerability in Amd Radeon Software, published on 12 May 2022. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Failure to verify the protocol in SMM may allow an attacker to control the protocol and modify SPI flash resulting in a potential arbitrary code execution.

## Which versions are affected by CVE-2021-26317?

It affects 74 products.


Products: Amd Athlon 3050ge Firmware, Amd Athlon 3150g Firmware, Amd Athlon 3150ge Firmware, Amd Radeon Software, Amd Ryzen 3 2200u Firmware, Amd Ryzen 3 2300u Firmware, Amd Ryzen 3 3100 Firmware, Amd Ryzen 3 3300g Firmware, Amd Ryzen 3 3300x Firmware, Amd Ryzen 3 5125c Firmware, Amd Ryzen 3 5400u Firmware, Amd Ryzen 3 5425c Firmware, Amd Ryzen 3 5425u Firmware, Amd Ryzen 5300g Firmware, Amd Ryzen 5300ge Firmware, Amd Ryzen 5600g Firmware, Amd Ryzen 5600ge Firmware, Amd Ryzen 5600x Firmware, Amd Ryzen 5700g Firmware, Amd Ryzen 5700ge Firmware and 54 more.

## How do I fix CVE-2021-26317?

No fix has been published for CVE-2021-26317 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-26317 being exploited?

There is no known exploitation of CVE-2021-26317 in the wild and no public exploit code.

## Other vulnerabilities in Amd Radeon Software

- [CVE-2021-26316](https://insights.sbomify.com/CVE-2021-26316/): Memory corruption in 1st Gen EPYC (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-2021-26317 and fix it if it is affected.

What it is: CVE-2021-26317 is a high-severity vulnerability in Amd Radeon Software, published on 12 May 2022. 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-2021-26317 in the wild and no public exploit code.

Affected product: Amd Radeon Software. 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-2021-26317/ (Markdown: https://insights.sbomify.com/CVE-2021-26317/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-26317
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-26317
- OSV: https://osv.dev/vulnerability/CVE-2021-26317

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-26317/
Summaries are generated and may contain mistakes; the official description above is the record.