# GSD-2021-1001561: mac80211: limit injected vht mcs/nss in ieee80211_parse_tx_radiotap

> An attacker with local access or adjacent network proximity can cause a denial of service in the Linux kernel by injecting malformed VHT MCS/NSS values in radiotap headers.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 19 Oct 2021

## What is GSD-2021-1001561?

GSD-2021-1001561 is a denial of service vulnerability in Kernel, published on 19 Oct 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

mac80211: limit injected vht mcs/nss in ieee80211_parse_tx_radiotap

This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven.
This ID is fixed in Linux Kernel version v4.19.209 by commit 76538c7b4df314bb937e44c5cb1782f37d47443c, it was introduced in version v4.7 by commit 646e76bb5daf4ca38438c69ffb72cccb605f3466. For more details please see the references link.

## Which versions are affected by GSD-2021-1001561?

1 open source package ship an affected version, including Kernel.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `Kernel` | Linux | All versions | None |

## How do I fix GSD-2021-1001561?

No fix has been published for GSD-2021-1001561 yet. Limit exposure of the affected software until one is available.

## Is GSD-2021-1001561 being exploited?

There is no known exploitation of GSD-2021-1001561 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for GSD-2021-1001561 and fix it if it is affected.

What it is: GSD-2021-1001561 is a denial of service vulnerability in Kernel, published on 19 Oct 2021. 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 GSD-2021-1001561 in the wild and no public exploit code.

Affected packages and fixed versions:
- Kernel (Linux): affected all versions; no fix listed

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/GSD-2021-1001561/ (Markdown: https://insights.sbomify.com/GSD-2021-1001561/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/GSD-2021-1001561

---
From sbomify Insights: https://insights.sbomify.com/GSD-2021-1001561/
Summaries are generated and may contain mistakes; the official description above is the record.