# GSD-2023-1001936: l2tp: close all race conditions in l2tp_tunnel_register()

> Race conditions in Linux kernel L2TP tunnel registration can lead to denial of service or privilege escalation for local attackers.

- **Severity:** Not scored
- **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:** 13 Feb 2023

## What is GSD-2023-1001936?

GSD-2023-1001936 is a vulnerability in Kernel, published on 13 Feb 2023. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

l2tp: close all race conditions in l2tp_tunnel_register()

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 v6.1.9 by commit cef0845b6dcfa2f6c2c832e7f9622551456c741d, it was introduced in version v3.6 by commit 37159ef2c1ae1e696b24b260b241209a19f92c60. For more details please see the references link.

## Which versions are affected by GSD-2023-1001936?

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-2023-1001936?

No fix has been published for GSD-2023-1001936 yet. Limit exposure of the affected software until one is available.

## Is GSD-2023-1001936 being exploited?

There is no known exploitation of GSD-2023-1001936 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for GSD-2023-1001936 and fix it if it is affected.

What it is: GSD-2023-1001936 is a vulnerability in Kernel, published on 13 Feb 2023. 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-2023-1001936 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-2023-1001936/ (Markdown: https://insights.sbomify.com/GSD-2023-1001936/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/GSD-2023-1001936

---
From sbomify Insights: https://insights.sbomify.com/GSD-2023-1001936/
Summaries are generated and may contain mistakes; the official description above is the record.