# NFSv4: Fix a deadlock when recovering state on a sillyrenamed file

CVE record · `CVE-2025-21900`

- **Identifiers:** `CVE-2025-21900`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** No
- **CNA:** Linux
- **Weakness (CWE):** [CWE-667](https://cwe.mitre.org/data/definitions/667.html)
- **Tags:** [CWE-667](https://agentprime.io/advisories/tag/cwe-667.md)
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 1 Apr 2025
- **Updated:** 5 Aug 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 1 Apr 2025, 15:26 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `adb4b42d19aea91826621a8d0bac94cf2c08f8bc to before 4fe4ae6c2e01d028856b73b6328b12b8945df871` (git)
  - affected: `adb4b42d19aea91826621a8d0bac94cf2c08f8bc to before f41a60bc43e7abbc636fee78bed0d74c31e738b0` (git)
  - affected: `adb4b42d19aea91826621a8d0bac94cf2c08f8bc to before 8f8df955f078e1a023ee55161935000a67651f38` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.11`
  - unaffected: `before 6.11` (semver)
  - unaffected: `6.12.18 to 6.12.*, inclusive` (semver)
  - unaffected: `6.13.6 to 6.13.*, inclusive` (semver)
  - unaffected: `6.14 to *, inclusive` (original_commit_for_fix)
  - Other versions: affected

## Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

## Severity and exploitation

- 7.5 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`, from CNA (Linux) (used for this record)
- 5.5 Medium, CVSS 3.1: `CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`, from ADP (CISA-ADP)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0036, the 29th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the CVE Program, published 1 Apr 2025. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2025-21900](https://www.cve.org/CVERecord?id=CVE-2025-21900)
- [NVD: CVE-2025-21900](https://nvd.nist.gov/vuln/detail/CVE-2025-21900)

### References from the CNA

- <https://git.kernel.org/stable/c/4fe4ae6c2e01d028856b73b6328b12b8945df871>
- <https://git.kernel.org/stable/c/f41a60bc43e7abbc636fee78bed0d74c31e738b0>
- <https://git.kernel.org/stable/c/8f8df955f078e1a023ee55161935000a67651f38>

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.

## Check whether this affects you

This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: <https://agentprime.io/mcp.md>
- As JSON: <https://api.agentprime.io/v1/advisories/CVE-2025-21900>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2025-21900/>. Everything for agents: <https://agentprime.io/llms.txt>.