# NFS: fix nfs_release_folio() to not deadlock via kcompactd writeback

CVE record · `CVE-2025-21908`

- **Identifiers:** `CVE-2025-21908`
- **State:** Confirmed
- **Severity:** CVSS 5.5 Medium
- **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:** 11 May 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 1 Apr 2025, 15:40 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: `96780ca55e3cbf4f150fd5a833a61492c9947b5b to before ab0727d6e2196682351c25c1dd112136f6991f11` (git)
  - affected: `96780ca55e3cbf4f150fd5a833a61492c9947b5b to before 5ae31c54cff745832b9bd5b32e71f3d1b607cd1e` (git)
  - affected: `96780ca55e3cbf4f150fd5a833a61492c9947b5b to before 8253ff29edcb429a9a6c75710941c6a16a9a34b1` (git)
  - affected: `96780ca55e3cbf4f150fd5a833a61492c9947b5b to before ce6d9c1c2b5cc785016faa11b48b6cd317eb367e` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.3`
  - unaffected: `before 6.3` (semver)
  - unaffected: `6.6.83 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.19 to 6.12.*, inclusive` (semver)
  - unaffected: `6.13.7 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

- 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:** 0.0016, the 4th 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-2025-21908](https://www.cve.org/CVERecord?id=CVE-2025-21908)
- [NVD: CVE-2025-21908](https://nvd.nist.gov/vuln/detail/CVE-2025-21908)

### References from the CNA

- <https://git.kernel.org/stable/c/ab0727d6e2196682351c25c1dd112136f6991f11>
- <https://git.kernel.org/stable/c/5ae31c54cff745832b9bd5b32e71f3d1b607cd1e>
- <https://git.kernel.org/stable/c/8253ff29edcb429a9a6c75710941c6a16a9a34b1>
- <https://git.kernel.org/stable/c/ce6d9c1c2b5cc785016faa11b48b6cd317eb367e>

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-2025-21908>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2025-21908/>. Everything for agents: <https://agentprime.io/llms.txt>.