# CVE-2021-26366: Information disclosure in Athlon™ Series

> An attacker with elevated privileges can read Boot ROM data, compromising system integrity on AMD Athlon and Ryzen processors.

- **Severity:** High 7.1 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N`)
- **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-gcw2-hf24-m7fv

## What is CVE-2021-26366?

CVE-2021-26366 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

An attacker, who gained elevated privileges via some other vulnerability, may be able to read data from Boot ROM resulting in a loss of system integrity.

## Which versions are affected by CVE-2021-26366?

It affects 63 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 5 2500u Firmware, Amd Ryzen 5 2600 Firmware, Amd Ryzen 5 2600h Firmware, Amd Ryzen 5 2600x Firmware, Amd Ryzen 5 3400g Firmware, Amd Ryzen 5 3450g Firmware, Amd Ryzen 5 3600 Firmware and 43 more.

## How do I fix CVE-2021-26366?

No fix has been published for CVE-2021-26366 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-26366 being exploited?

There is no known exploitation of CVE-2021-26366 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-2021-26317](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)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-26366 and fix it if it is affected.

What it is: CVE-2021-26366 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-2021-26366 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-2021-26366/ (Markdown: https://insights.sbomify.com/CVE-2021-26366/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-26366
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-26366
- OSV: https://osv.dev/vulnerability/CVE-2021-26366

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-26366/
Summaries are generated and may contain mistakes; the official description above is the record.