# nfsd: hold rcu across localio cmpxchg retry

CVE record · `CVE-2026-89670`

- **Identifiers:** `CVE-2026-89670`
- **State:** Confirmed
- **Severity:** CVSS 7.8 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: `e6f7e1487ab528a6c653bd0d42812ff2942846cd to before 763c0bad872368304db718f79af7e93048885c67` (git)
  - affected: `e6f7e1487ab528a6c653bd0d42812ff2942846cd to before 559570f91a7d4d199a72105e4980bef791f4cbf1` (git)
  - affected: `e6f7e1487ab528a6c653bd0d42812ff2942846cd to before 58884694978a3d7d111edb433d7fd6a6c5af2f34` (git)
  - affected: `986a21ace186433e0397a59491646edad8c8d636` (git)
  - affected: `6.15.3 to before 6.16` (semver)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.16`
  - unaffected: `before 6.16` (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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0017, the 6th 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-2026-89670](https://www.cve.org/CVERecord?id=CVE-2026-89670)
- [NVD: CVE-2026-89670](https://nvd.nist.gov/vuln/detail/CVE-2026-89670)

### References from the CNA

- <https://git.kernel.org/stable/c/763c0bad872368304db718f79af7e93048885c67>
- <https://git.kernel.org/stable/c/559570f91a7d4d199a72105e4980bef791f4cbf1>
- <https://git.kernel.org/stable/c/58884694978a3d7d111edb433d7fd6a6c5af2f34>

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-2026-89670>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89670/>. Everything for agents: <https://agentprime.io/llms.txt>.