# rxrpc, afs: Fix peer hash locking vs RCU callback

CVE record · `CVE-2025-21809`

- **Identifiers:** `CVE-2025-21809`
- **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:** 27 Feb 2025
- **Updated:** 5 Aug 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 27 Feb 2025, 20:01 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: `72904d7b9bfbf2dd146254edea93958bc35bbbfe to before 10ba5a3d57af20e494e0d979d1894260989235dd` (git)
  - affected: `72904d7b9bfbf2dd146254edea93958bc35bbbfe to before 0e77dd41689637ac4e1b8fe0f27541f373640855` (git)
  - affected: `72904d7b9bfbf2dd146254edea93958bc35bbbfe to before 79d458c13056559d49b5e41fbc4b6890e68cf65b` (git)
  - affected: `056fc740be000d39a7dba700a935f3bbfbc664e6` (git)
  - affected: `6.7.3 to before 6.8` (semver)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.8`
  - unaffected: `before 6.8` (semver)
  - unaffected: `6.12.13 to 6.12.*, inclusive` (semver)
  - unaffected: `6.13.2 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:** 0.0032, the 24th 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 27 Feb 2025. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2025-21809](https://www.cve.org/CVERecord?id=CVE-2025-21809)
- [NVD: CVE-2025-21809](https://nvd.nist.gov/vuln/detail/CVE-2025-21809)

### References from the CNA

- <https://git.kernel.org/stable/c/10ba5a3d57af20e494e0d979d1894260989235dd>
- <https://git.kernel.org/stable/c/0e77dd41689637ac4e1b8fe0f27541f373640855>
- <https://git.kernel.org/stable/c/79d458c13056559d49b5e41fbc4b6890e68cf65b>

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-2025-21809>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2025-21809/>. Everything for agents: <https://agentprime.io/llms.txt>.