# CVE-2025-68349: NFSv4/pNFS: Clear NFS_INO_LAYOUTCOMMIT in pnfs_mark_layout_stateid_invalid

> A null pointer dereference in the Linux kernel's NFSv4/pNFS module can cause a system crash during inode writes.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 24 Dec 2025
- **Updated:** 15 Oct 2026
- **Also known as:** AZL-73057, BELL-CVE-2025-68349, DEBIAN-CVE-2025-68349, GHSA-pchw-pcf7-8p47, OESA-2026-1011, ROOT-OS-DEBIAN-11-CVE-2025-68349, ROOT-OS-DEBIAN-12-CVE-2025-68349, ROOT-OS-DEBIAN-13-CVE-2025-68349, ROOT-OS-UBUNTU-2204-CVE-2025-68349, ROOT-OS-UBUNTU-2404-CVE-2025-68349, UBUNTU-CVE-2025-68349

## What is CVE-2025-68349?

CVE-2025-68349 is a high-severity vulnerability in Linux, published on 24 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

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

NFSv4/pNFS: Clear NFS_INO_LAYOUTCOMMIT in pnfs_mark_layout_stateid_invalid

Fixes a crash when layout is null during this call stack:

write_inode
    -> nfs4_write_inode
        -> pnfs_layoutcommit_inode

pnfs_set_layoutcommit relies on the lseg refcount to keep the layout
around. Need to clear NFS_INO_LAYOUTCOMMIT otherwise we might attempt
to reference a null layout.

## Which versions are affected by CVE-2025-68349?


## How do I fix CVE-2025-68349?

Apply the vendor's patch.

## Is CVE-2025-68349 being exploited?

There is no known exploitation of CVE-2025-68349 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-68349 and fix it if it is affected.

What it is: CVE-2025-68349 is a high-severity vulnerability in Linux, published on 24 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-68349 in the wild and no public exploit code.

Affected product: 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-2025-68349/ (Markdown: https://insights.sbomify.com/CVE-2025-68349/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-68349
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-68349
- OSV: https://osv.dev/vulnerability/CVE-2025-68349

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-68349/
Summaries are generated and may contain mistakes; the official description above is the record.