# CVE-2021-26384: Memory corruption in Athlon™ Series

> A malformed SMI command in AMD processors can cause out-of-bounds memory access, potentially leading to resource loss or code execution.

- **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:** 14 Jul 2022
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-cqhp-pw9h-ff47

## What is CVE-2021-26384?

CVE-2021-26384 is a high-severity memory corruption vulnerability in AMD Athlon™ Series, published on 14 Jul 2022. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A malformed SMI (System Management Interface) command may allow an attacker to establish a corrupted SMI Trigger Info data structure, potentially leading to out-of-bounds memory reads and writes when triggering an SMI resulting in a potential loss of resources.

Weakness: CWE-787 (Out-of-bounds Write), CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2021-26384?

It affects 52 products.


Products: Amd Athlon Gold 3150u Firmware, Amd Athlon Silver 3050u Firmware, Amd Ryzen 3 2200u Firmware, Amd Ryzen 3 2300u Firmware, Amd Ryzen 3 3200u Firmware, Amd Ryzen 3 3250u Firmware, Amd Ryzen 3 3300u Firmware, Amd Ryzen 3 3350u Firmware, Amd Ryzen 3 3450u Firmware, Amd Ryzen 3 3500c Firmware, Amd Ryzen 3 3500u Firmware, Amd Ryzen 3 3550h Firmware, Amd Ryzen 3 3580u Firmware, Amd Ryzen 3 3700c Firmware, Amd Ryzen 3 3700u Firmware, Amd Ryzen 3 3750h Firmware, Amd Ryzen 3 3780u Firmware, Amd Ryzen 3 5125c Firmware, Amd Ryzen 3 5300g Firmware, Amd Ryzen 3 5300ge Firmware and 32 more.

## How do I fix CVE-2021-26384?

No fix has been published for CVE-2021-26384 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-26384 being exploited?

There is no known exploitation of CVE-2021-26384 in the wild and no public exploit code.

## Other vulnerabilities in AMD Athlon™ Series

- [CVE-2023-20558](https://insights.sbomify.com/CVE-2023-20558/): Privilege escalation in Ryzen™ Threadripper™ PRO Processor (high 8.8)
- [CVE-2023-20559](https://insights.sbomify.com/CVE-2023-20559/): Privilege escalation in Ryzen™ Threadripper™ PRO Processor (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-26384 and fix it if it is affected.

What it is: CVE-2021-26384 is a high-severity memory corruption vulnerability in AMD Athlon™ Series, published on 14 Jul 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-2021-26384 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-2021-26384/ (Markdown: https://insights.sbomify.com/CVE-2021-26384/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-26384
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-26384
- OSV: https://osv.dev/vulnerability/CVE-2021-26384

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-26384/
Summaries are generated and may contain mistakes; the official description above is the record.