# NFSD: check truncate permission under inode lock

CVE record · `CVE-2026-89713`

- **Identifiers:** `CVE-2026-89713`
- **State:** Confirmed
- **Severity:** CVSS 9.1 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 9.1: 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: `783112f7401ff449d979530209b3f6c2594fdb4e to before 0669861a2e8e2bdb9c1149417d8ad821996ae4fe` (git)
  - affected: `783112f7401ff449d979530209b3f6c2594fdb4e to before 52d0c5bdfe232c9974d4b11f97078b9c7814f05d` (git)
  - affected: `783112f7401ff449d979530209b3f6c2594fdb4e to before 3afa17d93ba8c925f49370c816c6dae5112d8c24` (git)
  - affected: `783112f7401ff449d979530209b3f6c2594fdb4e to before d8352da196349182e1afd5a93308256cddc0a97d` (git)
  - affected: `783112f7401ff449d979530209b3f6c2594fdb4e to before 44086254479035de42ca3d286ecf25521d4e6325` (git)
  - affected: `783112f7401ff449d979530209b3f6c2594fdb4e to before b778e0e0a16759f22a70579c3cf8d254a40d4a7f` (git)
  - affected: `604a3c407026d6162d15300478e63f901e435efc` (git)
  - affected: `cc4d5dc73841b98d33cdfb9822d70b0aac4beca5` (git)
  - affected: `3ee4f442e5b37a537297b812557b1163f96b5399` (git)
  - affected: `a3c6cbc4eac4473ed5461d5faae2794d3e5c0e44` (git)
  - affected: `982898d7f97a35447403c3fcecc0d96c646ce101` (git)
  - affected: `3.2.89 to before 3.3` (semver)
  - and 4 more
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.11`
  - unaffected: `before 4.11` (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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0066, the 52nd 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-2026-89713](https://www.cve.org/CVERecord?id=CVE-2026-89713)
- [NVD: CVE-2026-89713](https://nvd.nist.gov/vuln/detail/CVE-2026-89713)

### References from the CNA

- <https://git.kernel.org/stable/c/0669861a2e8e2bdb9c1149417d8ad821996ae4fe>
- <https://git.kernel.org/stable/c/52d0c5bdfe232c9974d4b11f97078b9c7814f05d>
- <https://git.kernel.org/stable/c/3afa17d93ba8c925f49370c816c6dae5112d8c24>
- <https://git.kernel.org/stable/c/d8352da196349182e1afd5a93308256cddc0a97d>
- <https://git.kernel.org/stable/c/44086254479035de42ca3d286ecf25521d4e6325>
- <https://git.kernel.org/stable/c/b778e0e0a16759f22a70579c3cf8d254a40d4a7f>

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-2026-89713>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89713/>. Everything for agents: <https://agentprime.io/llms.txt>.