# nfsd: revoke copy-notify stateids before dropping their reference

CVE record · `CVE-2026-89663`

- **Identifiers:** `CVE-2026-89663`
- **State:** Confirmed
- **Severity:** CVSS 8.8 High
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 11 Sept 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 11 Sept 2026, 19:45 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: `624322f1adc58acd0b69f77a6ddc764207e97241 to before 5f00e0ab4de45d4f9e4bd0883cf2517acf63fc0d` (git)
  - affected: `624322f1adc58acd0b69f77a6ddc764207e97241 to before 06a62f6dbc60791f4229c6950b1eec6b18df9af1` (git)
  - affected: `624322f1adc58acd0b69f77a6ddc764207e97241 to before a1fca0f7bbb7b100a39c7ba8dd7922c87c4237a3` (git)
  - affected: `624322f1adc58acd0b69f77a6ddc764207e97241 to before caddbeffab1eaba1d2bcf5ceda35547863466705` (git)
  - affected: `624322f1adc58acd0b69f77a6ddc764207e97241 to before 6b8149448cdcb476fba4559d1ecc247efee9971b` (git)
  - affected: `624322f1adc58acd0b69f77a6ddc764207e97241 to before b56d2c5f01cddbeca7d11cce81d97db4ec9a464f` (git)
  - affected: `624322f1adc58acd0b69f77a6ddc764207e97241 to before ff8a3cff02b92b2a82f1a9876038fcf953ae9c25` (git)
  - affected: `624322f1adc58acd0b69f77a6ddc764207e97241 to before 3b0c3595db99bb4bebd7c8aa8a36f3c50e411bb7` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.6`
  - unaffected: `before 5.6` (semver)
  - unaffected: `5.10.270 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.221 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.188 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.157 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.109 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.50 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

## 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

- 8.8 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`, from CNA (Linux)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0046, the 40th 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-2026-89663](https://www.cve.org/CVERecord?id=CVE-2026-89663)
- [NVD: CVE-2026-89663](https://nvd.nist.gov/vuln/detail/CVE-2026-89663)

### References from the CNA

- <https://git.kernel.org/stable/c/5f00e0ab4de45d4f9e4bd0883cf2517acf63fc0d>
- <https://git.kernel.org/stable/c/06a62f6dbc60791f4229c6950b1eec6b18df9af1>
- <https://git.kernel.org/stable/c/a1fca0f7bbb7b100a39c7ba8dd7922c87c4237a3>
- <https://git.kernel.org/stable/c/caddbeffab1eaba1d2bcf5ceda35547863466705>
- <https://git.kernel.org/stable/c/6b8149448cdcb476fba4559d1ecc247efee9971b>
- <https://git.kernel.org/stable/c/b56d2c5f01cddbeca7d11cce81d97db4ec9a464f>
- <https://git.kernel.org/stable/c/ff8a3cff02b92b2a82f1a9876038fcf953ae9c25>
- <https://git.kernel.org/stable/c/3b0c3595db99bb4bebd7c8aa8a36f3c50e411bb7>

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-2026-89663>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89663/>. Everything for agents: <https://agentprime.io/llms.txt>.