# GSD-2021-1001519: staging: greybus: uart: fix tty use after free

> A use-after-free vulnerability in the Linux Kernel greybus UART driver could allow local attackers to execute code or escalate privileges.

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

## What is GSD-2021-1001519?

GSD-2021-1001519 is an use after free vulnerability in Kernel, published on 19 Oct 2021. It can only be exploited from the same machine or local network.

### Official description

staging: greybus: uart: fix tty use after free

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 v4.9.285 by commit 92b67aaafb7c449db9f0c3dcabc0ff967cb3a42d, it was introduced in version v4.9 by commit a18e15175708d39abbe9746ddc3479466b7800c3. For more details please see the references link.

## Which versions are affected by GSD-2021-1001519?

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-2021-1001519?

No fix has been published for GSD-2021-1001519 yet. Limit exposure of the affected software until one is available.

## Is GSD-2021-1001519 being exploited?

There is no known exploitation of GSD-2021-1001519 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for GSD-2021-1001519 and fix it if it is affected.

What it is: GSD-2021-1001519 is an use after free vulnerability in Kernel, published on 19 Oct 2021. It can only be exploited from the same machine or local network.
Exploitation: There is no known exploitation of GSD-2021-1001519 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-2021-1001519/ (Markdown: https://insights.sbomify.com/GSD-2021-1001519/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/GSD-2021-1001519

---
From sbomify Insights: https://insights.sbomify.com/GSD-2021-1001519/
Summaries are generated and may contain mistakes; the official description above is the record.