# nfsd: fix XDR length calculation in nfsd4_ff_encode_layoutget

CVE record · `CVE-2026-89674`

- **Identifiers:** `CVE-2026-89674`
- **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:** 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.

## 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: `9b9960a0ca4773e21c4b153ed355583946346b25 to before 3a7fd224df0fbb42167eb1b77be45d72fe0b1098` (git)
  - affected: `9b9960a0ca4773e21c4b153ed355583946346b25 to before 29e4478e2ed5a227e8f0c33cacb91bf227cedd47` (git)
  - affected: `9b9960a0ca4773e21c4b153ed355583946346b25 to before 65a72b721943618eeb3a41c8b36e915591f3f83f` (git)
  - affected: `9b9960a0ca4773e21c4b153ed355583946346b25 to before bee826c00ac900473f91306f1f3e5a5a81fd4a74` (git)
  - affected: `9b9960a0ca4773e21c4b153ed355583946346b25 to before e7d9d23ecd9172f05b09bb678ff22db8e361c428` (git)
  - affected: `9b9960a0ca4773e21c4b153ed355583946346b25 to before 0380129b1373c437eb35401a174671c8888f4b80` (git)
  - affected: `9b9960a0ca4773e21c4b153ed355583946346b25 to before c81cef6a805dec266c10fc4f83c93d6fcf1a2b43` (git)
  - affected: `9b9960a0ca4773e21c4b153ed355583946346b25 to before f9868174af49d207fbaf0c5e055d088a983684af` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.8`
  - unaffected: `before 4.8` (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

- 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:** 0.0051, the 44th 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-2026-89674](https://www.cve.org/CVERecord?id=CVE-2026-89674)
- [NVD: CVE-2026-89674](https://nvd.nist.gov/vuln/detail/CVE-2026-89674)

### References from the CNA

- <https://git.kernel.org/stable/c/3a7fd224df0fbb42167eb1b77be45d72fe0b1098>
- <https://git.kernel.org/stable/c/29e4478e2ed5a227e8f0c33cacb91bf227cedd47>
- <https://git.kernel.org/stable/c/65a72b721943618eeb3a41c8b36e915591f3f83f>
- <https://git.kernel.org/stable/c/bee826c00ac900473f91306f1f3e5a5a81fd4a74>
- <https://git.kernel.org/stable/c/e7d9d23ecd9172f05b09bb678ff22db8e361c428>
- <https://git.kernel.org/stable/c/0380129b1373c437eb35401a174671c8888f4b80>
- <https://git.kernel.org/stable/c/c81cef6a805dec266c10fc4f83c93d6fcf1a2b43>
- <https://git.kernel.org/stable/c/f9868174af49d207fbaf0c5e055d088a983684af>

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-2026-89674>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89674/>. Everything for agents: <https://agentprime.io/llms.txt>.