# ksmbd: fix use-after-free in oplock break notification

CVE record · `CVE-2026-80926`

- **Identifiers:** `CVE-2026-80926`
- **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, 19:37 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: `945a86b21b40fb17183f5b27461baa6f03e2467f to before 892f643b141aee3f7aa7c0fc61ddcb55c59f1996` (git)
  - affected: `1ff58dcfcab434ebb51649da33774fbb8e1f7b67 to before 5de0527f782430b1109a447646e32033ad018a6a` (git)
  - affected: `e735dbd489e3ea02be78dba991056fe1138be51e to before c8279ae8df68cce9cd3b785e85f7a86c80a46e78` (git)
  - affected: `b003086d76968298f22e7cf62239833b5a3a06b1 to before 8cc98db4fc590e6c7d9db6529320982ee16c5d1d` (git)
  - affected: `b003086d76968298f22e7cf62239833b5a3a06b1 to before 0e753899627b5e28a9fea8bca98262a6f65a2452` (git)
  - affected: `75e33deda658c1ab3a9336cbdb1436536f9b3660` (git)
  - affected: `6.6.143 to before 6.6.158` (semver)
  - affected: `6.12.94 to before 6.12.111` (semver)
  - affected: `6.18.36 to before 6.18.51` (semver)
  - affected: `7.0.13 to before 7.1` (semver)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `7.1`
  - unaffected: `before 7.1` (semver)
  - unaffected: `6.6.158 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:** 0.0044, the 39th 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-2026-80926](https://www.cve.org/CVERecord?id=CVE-2026-80926)
- [NVD: CVE-2026-80926](https://nvd.nist.gov/vuln/detail/CVE-2026-80926)

### References from the CNA

- <https://git.kernel.org/stable/c/892f643b141aee3f7aa7c0fc61ddcb55c59f1996>
- <https://git.kernel.org/stable/c/5de0527f782430b1109a447646e32033ad018a6a>
- <https://git.kernel.org/stable/c/c8279ae8df68cce9cd3b785e85f7a86c80a46e78>
- <https://git.kernel.org/stable/c/8cc98db4fc590e6c7d9db6529320982ee16c5d1d>
- <https://git.kernel.org/stable/c/0e753899627b5e28a9fea8bca98262a6f65a2452>

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-2026-80926>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-80926/>. Everything for agents: <https://agentprime.io/llms.txt>.