# nfsd: fix clock domain mismatch in clients_still_reclaiming()

CVE record · `CVE-2026-89685`

- **Identifiers:** `CVE-2026-89685`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 11 Sept 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 11 Sept 2026, 19:46 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: `20b7d86f29d39e8ae19bb29c24ffee70dc385ddf to before 7ca44a63d9a554ba7ad05b06d88746eab08b760e` (git)
  - affected: `20b7d86f29d39e8ae19bb29c24ffee70dc385ddf to before 2c9efc6b692a153643d0f204b3c3632cb6b5761e` (git)
  - affected: `20b7d86f29d39e8ae19bb29c24ffee70dc385ddf to before a22ee3a2cadef44f2edeb909ae36bd72450a3a35` (git)
  - affected: `20b7d86f29d39e8ae19bb29c24ffee70dc385ddf to before 04c3e4456fe76e8d7c94171009df3165c3262c51` (git)
  - affected: `20b7d86f29d39e8ae19bb29c24ffee70dc385ddf to before e92e80c5b043108029bc729b30d12c37158fb9cb` (git)
  - affected: `20b7d86f29d39e8ae19bb29c24ffee70dc385ddf to before f9cec313efb2fd18d962aad738a4892bce806016` (git)
  - affected: `20b7d86f29d39e8ae19bb29c24ffee70dc385ddf to before 9843649196221152b6e5d138a3ce859bdaae1d96` (git)
  - affected: `20b7d86f29d39e8ae19bb29c24ffee70dc385ddf to before 09ea3eb9a518565f5bca386e81b993ed8825f5e8` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.6`
  - unaffected: `before 5.6` (semver)
  - unaffected: `5.10.273 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.224 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.111 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.51 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.4 to 7.2.*, inclusive` (semver)
  - unaffected: `7.3 to *, inclusive` (original_commit_for_fix)
  - Other versions: affected

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> The nfsd NFS server in the Linux kernel is affected from 5.6 onward. A client sending CLAIM_PREVIOUS OPEN requests can keep the server in grace indefinitely, blocking non-reclaim operations for other clients. Upgrade to 5.10.273 or later, 5.15.224 or later, 6.1.191 or later, or 6.6.160 or later, matching your kernel's stable series.

Written 12 Nov 2026.

## 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)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0061, the 49th percentile, on 14 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 11 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-89685](https://www.cve.org/CVERecord?id=CVE-2026-89685)
- [NVD: CVE-2026-89685](https://nvd.nist.gov/vuln/detail/CVE-2026-89685)

### References from the CNA

- <https://git.kernel.org/stable/c/7ca44a63d9a554ba7ad05b06d88746eab08b760e>
- <https://git.kernel.org/stable/c/2c9efc6b692a153643d0f204b3c3632cb6b5761e>
- <https://git.kernel.org/stable/c/a22ee3a2cadef44f2edeb909ae36bd72450a3a35>
- <https://git.kernel.org/stable/c/04c3e4456fe76e8d7c94171009df3165c3262c51>
- <https://git.kernel.org/stable/c/e92e80c5b043108029bc729b30d12c37158fb9cb>
- <https://git.kernel.org/stable/c/f9cec313efb2fd18d962aad738a4892bce806016>
- <https://git.kernel.org/stable/c/9843649196221152b6e5d138a3ce859bdaae1d96>
- <https://git.kernel.org/stable/c/09ea3eb9a518565f5bca386e81b993ed8825f5e8>

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-2026-89685>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89685/>. Everything for agents: <https://agentprime.io/llms.txt>.