# NFSD: Prevent client use-after-free during blocked-lock reaping

CVE record · `CVE-2026-90036`

- **Identifiers:** `CVE-2026-90036`
- **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:** 16 Sept 2026
- **Updated:** 21 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 16 Sept 2026, 10:33 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: `7919d0a27f1e7cb324e023776aa1cbff00f1ee7b to before 0d53a47c913d0bce3b5ec35c28cbcca4d015f33d` (git)
  - affected: `7919d0a27f1e7cb324e023776aa1cbff00f1ee7b to before 7081224a59a0ca4edcd62c068588f4d900199a18` (git)
  - affected: `7919d0a27f1e7cb324e023776aa1cbff00f1ee7b to before cd489b03587378645fe0d20142a33f1ed60bac98` (git)
  - affected: `7919d0a27f1e7cb324e023776aa1cbff00f1ee7b to before 6fedb2eaff77554ca7a0deffd2e8bc0d6e8b38b0` (git)
  - affected: `7919d0a27f1e7cb324e023776aa1cbff00f1ee7b to before 9026932ac8be4d0ae01db47f23619a98cc57b671` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.9`
  - unaffected: `before 4.9` (semver)
  - unaffected: `6.6.160 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.111 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.51 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.5 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:** 0.0048, the 42nd percentile, on 13 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 16 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-90036](https://www.cve.org/CVERecord?id=CVE-2026-90036)
- [NVD: CVE-2026-90036](https://nvd.nist.gov/vuln/detail/CVE-2026-90036)

### References from the CNA

- <https://git.kernel.org/stable/c/0d53a47c913d0bce3b5ec35c28cbcca4d015f33d>
- <https://git.kernel.org/stable/c/7081224a59a0ca4edcd62c068588f4d900199a18>
- <https://git.kernel.org/stable/c/cd489b03587378645fe0d20142a33f1ed60bac98>
- <https://git.kernel.org/stable/c/6fedb2eaff77554ca7a0deffd2e8bc0d6e8b38b0>
- <https://git.kernel.org/stable/c/9026932ac8be4d0ae01db47f23619a98cc57b671>

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-2026-90036>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-90036/>. Everything for agents: <https://agentprime.io/llms.txt>.