# GSD-2023-1000641: fs/ntfs3: Avoid UBSAN error on true_sectors_per_clst()

> A local attacker can trigger a UBSAN error in the NTFS3 filesystem driver, potentially causing a denial of service.

- **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:** 17 Jan 2023

## What is GSD-2023-1000641?

GSD-2023-1000641 is a vulnerability in Kernel, published on 17 Jan 2023. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

fs/ntfs3: Avoid UBSAN error on true_sectors_per_clst()

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 v6.0.16 by commit 8fe280ae85177c2323ae8c9849ff27a3a6b69506, it was introduced in version v5.19 by commit a3b774342fa752a5290c0de36375289dfcf4a260. For more details please see the references link.

## Which versions are affected by GSD-2023-1000641?

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-2023-1000641?

No fix has been published for GSD-2023-1000641 yet. Limit exposure of the affected software until one is available.

## Is GSD-2023-1000641 being exploited?

There is no known exploitation of GSD-2023-1000641 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for GSD-2023-1000641 and fix it if it is affected.

What it is: GSD-2023-1000641 is a vulnerability in Kernel, published on 17 Jan 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-2023-1000641 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-2023-1000641/ (Markdown: https://insights.sbomify.com/GSD-2023-1000641/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/GSD-2023-1000641

---
From sbomify Insights: https://insights.sbomify.com/GSD-2023-1000641/
Summaries are generated and may contain mistakes; the official description above is the record.