# GSD-2022-1006377: sch_sfb: Don't assume the skb is still around after enqueueing to child

> A use-after-free vulnerability in the Linux kernel's SFB scheduler allows attackers to cause denial of service or potentially execute code.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 2 Oct 2022

## What is GSD-2022-1006377?

GSD-2022-1006377 is an use after free vulnerability in Kernel, published on 2 Oct 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

sch_sfb: Don't assume the skb is still around after enqueueing to child

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 v5.15.68 by commit 1a889da60afc017050e1f517b3b976b462846668, it was introduced in version v2.6.39 by commit e13e02a3c68d899169c78d9a18689bd73491d59a. For more details please see the references link.

## Which versions are affected by GSD-2022-1006377?

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-2022-1006377?

No fix has been published for GSD-2022-1006377 yet. Limit exposure of the affected software until one is available.

## Is GSD-2022-1006377 being exploited?

There is no known exploitation of GSD-2022-1006377 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for GSD-2022-1006377 and fix it if it is affected.

What it is: GSD-2022-1006377 is an use after free vulnerability in Kernel, published on 2 Oct 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of GSD-2022-1006377 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-2022-1006377/ (Markdown: https://insights.sbomify.com/GSD-2022-1006377/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/GSD-2022-1006377

---
From sbomify Insights: https://insights.sbomify.com/GSD-2022-1006377/
Summaries are generated and may contain mistakes; the official description above is the record.