# nfsd: fix BUG_ON in nfsd4_alloc_layout_stateid on racing delegation revoke

CVE record · `CVE-2026-89686`

- **Identifiers:** `CVE-2026-89686`
- **State:** Confirmed
- **Severity:** CVSS 9.8 Critical
- **Critical:** Yes: CVSS 9+
- **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.

## Critical

Critical, because:

- CVSS score 9.8: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `c5c707f96fc9a6e5a57ca5baac892673270abe3d to before f5011c26246d1abed3dc750c9744e33cb79ff9bc` (git)
  - affected: `c5c707f96fc9a6e5a57ca5baac892673270abe3d to before d12af460df27876661707efab3a8532146cb961f` (git)
  - affected: `c5c707f96fc9a6e5a57ca5baac892673270abe3d to before c517f27498757e616d2a8fe6d16caad1fee422e6` (git)
  - affected: `c5c707f96fc9a6e5a57ca5baac892673270abe3d to before 607a56fea772c1f4f4989d8e255dd4f7192d9604` (git)
  - affected: `c5c707f96fc9a6e5a57ca5baac892673270abe3d to before 97bda8b4284d90897a1f1922e5082ff9e35d7c7e` (git)
  - affected: `c5c707f96fc9a6e5a57ca5baac892673270abe3d to before ca94ba36172046be6a694a7986f6931e47ed4d51` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.0`
  - unaffected: `before 4.0` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0071, the 54th 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-2026-89686](https://www.cve.org/CVERecord?id=CVE-2026-89686)
- [NVD: CVE-2026-89686](https://nvd.nist.gov/vuln/detail/CVE-2026-89686)

### References from the CNA

- <https://git.kernel.org/stable/c/f5011c26246d1abed3dc750c9744e33cb79ff9bc>
- <https://git.kernel.org/stable/c/d12af460df27876661707efab3a8532146cb961f>
- <https://git.kernel.org/stable/c/c517f27498757e616d2a8fe6d16caad1fee422e6>
- <https://git.kernel.org/stable/c/607a56fea772c1f4f4989d8e255dd4f7192d9604>
- <https://git.kernel.org/stable/c/97bda8b4284d90897a1f1922e5082ff9e35d7c7e>
- <https://git.kernel.org/stable/c/ca94ba36172046be6a694a7986f6931e47ed4d51>

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-2026-89686>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89686/>. Everything for agents: <https://agentprime.io/llms.txt>.