# CVE-2025-38167: fs/ntfs3: handle hdr_first_de() return value

> A missing null check in the Linux kernel NTFS3 driver can cause a crash when handling directory entries, leading to denial of service.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`)
- **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:** Yes
- **Published:** 3 Jul 2025
- **Updated:** 15 Oct 2026
- **Also known as:** AZL-64634, BELL-CVE-2025-38167, DEBIAN-CVE-2025-38167, GHSA-7qr6-7j77-6prp, ROOT-OS-DEBIAN-12-CVE-2025-38167, ROOT-OS-UBUNTU-2204-CVE-2025-38167, ROOT-OS-UBUNTU-2404-CVE-2025-38167, UBUNTU-CVE-2025-38167

## What is CVE-2025-38167?

CVE-2025-38167 is a medium-severity vulnerability in Debian Debian Linux, published on 3 Jul 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

In the Linux kernel, the following vulnerability has been resolved:

fs/ntfs3: handle hdr_first_de() return value

The hdr_first_de() function returns a pointer to a struct NTFS_DE. This
pointer may be NULL. To handle the NULL error effectively, it is important
to implement an error handler. This will help manage potential errors
consistently.

Additionally, error handling for the return value already exists at other
points where this function is called.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2025-38167?

It affects 2 products.


Products: Debian Debian Linux, Linux kernel.

## How do I fix CVE-2025-38167?

Apply the vendor's patch.

## Is CVE-2025-38167 being exploited?

There is no known exploitation of CVE-2025-38167 in the wild and no public exploit code.

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- [CVE-2026-24061](https://insights.sbomify.com/CVE-2026-24061/): GNU InetUtils Argument Injection (critical 9.8, exploited in the wild)
- [CVE-2025-39682](https://insights.sbomify.com/CVE-2025-39682/): Linux Kernel Improper Check for Unusual or Exceptional Conditions (critical 9.8, exploited in the wild)
- [CVE-2024-9680](https://insights.sbomify.com/CVE-2024-9680/): Mozilla Firefox Use-After-Free (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-38167 and fix it if it is affected.

What it is: CVE-2025-38167 is a medium-severity vulnerability in Debian Debian Linux, published on 3 Jul 2025. 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 CVE-2025-38167 in the wild and no public exploit code.

Affected product: Debian Debian Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.

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/CVE-2025-38167/ (Markdown: https://insights.sbomify.com/CVE-2025-38167/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-38167
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-38167
- OSV: https://osv.dev/vulnerability/CVE-2025-38167

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-38167/
Summaries are generated and may contain mistakes; the official description above is the record.