# GSD-2022-1004369: x86/kvm: fix FASTOP_SIZE when return thunks are enabled

> Fixes a kernel size calculation error in KVM when return thunks are enabled, potentially affecting stability or security.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Not stated
- **Attackable:** Not stated
- **Victim action needed:** Not stated
- **Fix available:** No
- **Published:** 31 Jul 2022

## What is GSD-2022-1004369?

GSD-2022-1004369 is a vulnerability in Kernel, published on 31 Jul 2022. 

### Official description

x86/kvm: fix FASTOP_SIZE when return thunks are enabled

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 v5.15.57 by commit 198685e58b134679e6079d872396f4352780282f, it was introduced in version v5.15.57 by commit 1d61a2988612ac0632134454d5407c63ae0b9d42. For more details please see the references link.

## Which versions are affected by GSD-2022-1004369?

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-2022-1004369?

No fix has been published for GSD-2022-1004369 yet. Limit exposure of the affected software until one is available.

## Is GSD-2022-1004369 being exploited?

There is no known exploitation of GSD-2022-1004369 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for GSD-2022-1004369 and fix it if it is affected.

What it is: GSD-2022-1004369 is a vulnerability in Kernel, published on 31 Jul 2022. 
Exploitation: There is no known exploitation of GSD-2022-1004369 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-2022-1004369/ (Markdown: https://insights.sbomify.com/GSD-2022-1004369/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/GSD-2022-1004369

---
From sbomify Insights: https://insights.sbomify.com/GSD-2022-1004369/
Summaries are generated and may contain mistakes; the official description above is the record.