# nfsd: Reset write verifier when async COPY writeback fails

CVE record · `CVE-2026-89706`

- **Identifiers:** `CVE-2026-89706`
- **State:** Confirmed
- **Severity:** CVSS 7.5 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, 19:46 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.

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `817c6eb975798647c4bbbfc9eb288aa413ec7f65 to before cc5f7cef0659a27c13dd33edd8e2f79257b095c6` (git)
  - affected: `eac0b17a77fbd763d305a5eaa4fd1119e5a0fe0d to before c6d2f6372c7e0f76b9c148ff7696aec64da0b5b7` (git)
  - affected: `eac0b17a77fbd763d305a5eaa4fd1119e5a0fe0d to before 8a08ffe73eb2aa6bc6f88763da7e2b55bab6493a` (git)
  - affected: `eac0b17a77fbd763d305a5eaa4fd1119e5a0fe0d to before 6b13d26cc21b6320a3c61d5e4cee2ce9a589b181` (git)
  - affected: `eac0b17a77fbd763d305a5eaa4fd1119e5a0fe0d to before 31d4d0a62ec4bafbcdbad142f11ab1f90794b1d0` (git)
  - affected: `eac0b17a77fbd763d305a5eaa4fd1119e5a0fe0d to before 591134e059e3456180244a826d6917cdc183140b` (git)
  - affected: `eac0b17a77fbd763d305a5eaa4fd1119e5a0fe0d to before bf0cd31a9abcb728c17d79b4c2cc533612a8b6af` (git)
  - affected: `eac0b17a77fbd763d305a5eaa4fd1119e5a0fe0d to before f5cb2276954cb80987a93ef9f9dfbfdbfc0f10b9` (git)
  - affected: `5.10.220 to before 5.10.270` (semver)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.14`
  - unaffected: `before 5.14` (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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0053, the 45th 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-2026-89706](https://www.cve.org/CVERecord?id=CVE-2026-89706)
- [NVD: CVE-2026-89706](https://nvd.nist.gov/vuln/detail/CVE-2026-89706)

### References from the CNA

- <https://git.kernel.org/stable/c/cc5f7cef0659a27c13dd33edd8e2f79257b095c6>
- <https://git.kernel.org/stable/c/c6d2f6372c7e0f76b9c148ff7696aec64da0b5b7>
- <https://git.kernel.org/stable/c/8a08ffe73eb2aa6bc6f88763da7e2b55bab6493a>
- <https://git.kernel.org/stable/c/6b13d26cc21b6320a3c61d5e4cee2ce9a589b181>
- <https://git.kernel.org/stable/c/31d4d0a62ec4bafbcdbad142f11ab1f90794b1d0>
- <https://git.kernel.org/stable/c/591134e059e3456180244a826d6917cdc183140b>
- <https://git.kernel.org/stable/c/bf0cd31a9abcb728c17d79b4c2cc533612a8b6af>
- <https://git.kernel.org/stable/c/f5cb2276954cb80987a93ef9f9dfbfdbfc0f10b9>

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-2026-89706>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89706/>. Everything for agents: <https://agentprime.io/llms.txt>.