# nfsd: clear opcnt on compound arg release to prevent OOB read

CVE record · `CVE-2026-89691`

- **Identifiers:** `CVE-2026-89691`
- **State:** Confirmed
- **Severity:** CVSS 7.1 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: `bd9d6a3efa9709e653aafbeb859289feccb8e70c to before 58bcdfb2b2e412088839ae740b1a95154dc0b8d0` (git)
  - affected: `bd9d6a3efa9709e653aafbeb859289feccb8e70c to before e879148867bd4c4cac42e063ffaffa187dddc6fe` (git)
  - affected: `bd9d6a3efa9709e653aafbeb859289feccb8e70c to before c1a4f7b1848f95302df598217e1c7a1410c2d0c5` (git)
  - affected: `bd9d6a3efa9709e653aafbeb859289feccb8e70c to before ae4c38555e81563b8dc5eae55ffd70f0ea97aa5a` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.7`
  - unaffected: `before 6.7` (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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0013, the 2nd 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-2026-89691](https://www.cve.org/CVERecord?id=CVE-2026-89691)
- [NVD: CVE-2026-89691](https://nvd.nist.gov/vuln/detail/CVE-2026-89691)

### References from the CNA

- <https://git.kernel.org/stable/c/58bcdfb2b2e412088839ae740b1a95154dc0b8d0>
- <https://git.kernel.org/stable/c/e879148867bd4c4cac42e063ffaffa187dddc6fe>
- <https://git.kernel.org/stable/c/c1a4f7b1848f95302df598217e1c7a1410c2d0c5>
- <https://git.kernel.org/stable/c/ae4c38555e81563b8dc5eae55ffd70f0ea97aa5a>

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-2026-89691>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89691/>. Everything for agents: <https://agentprime.io/llms.txt>.