# CVE-2021-26351: Denial of service in Athlon™ Series

> Insufficient DRAM address validation in AMD SMU allows DMA to invalid addresses, causing denial of service on Athlon and Ryzen processors.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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:** 16 Sep 2024
- **Also known as:** GHSA-5pj8-h4rh-gp3h

## What is CVE-2021-26351?

CVE-2021-26351 is a medium-severity denial of service vulnerability in AMD Athlon™ Series, 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

Insufficient DRAM address validation in System Management Unit (SMU) may result in a DMA (Direct Memory Access) read/write from/to invalid DRAM address that could result in denial of service.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2021-26351?

It affects 49 products.


Products: 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 3400g Firmware, Amd Ryzen 5 3450g Firmware, Amd Ryzen 5 3600 Firmware, Amd Ryzen 5 3600x Firmware, Amd Ryzen 5 5560u Firmware, Amd Ryzen 5 5600h Firmware, Amd Ryzen 5 5600hs Firmware, Amd Ryzen 5 5600u Firmware, Amd Ryzen 5 5600x Firmware, Amd Ryzen 5 5625c Firmware, Amd Ryzen 5 5625u Firmware, Amd Ryzen 5 5700g Firmware, Amd Ryzen 5 5700ge Firmware and 29 more.

## How do I fix CVE-2021-26351?

No fix has been published for CVE-2021-26351 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-26351 being exploited?

There is no known exploitation of CVE-2021-26351 in the wild and no public exploit code.

## Other vulnerabilities in AMD Athlon™ Series

- [CVE-2021-26346](https://insights.sbomify.com/CVE-2021-26346/): Integer overflow in Ryzen 5000 Series (medium 5.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-26351 and fix it if it is affected.

What it is: CVE-2021-26351 is a medium-severity denial of service vulnerability in AMD Athlon™ Series, 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-2021-26351 in the wild and no public exploit code.

Affected product: AMD Athlon™ Series. 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-2021-26351/ (Markdown: https://insights.sbomify.com/CVE-2021-26351/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-26351
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-26351
- OSV: https://osv.dev/vulnerability/CVE-2021-26351

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-26351/
Summaries are generated and may contain mistakes; the official description above is the record.