# ksmbd: safely discard unregistered deferred locks

CVE record · `CVE-2026-90156`

- **Identifiers:** `CVE-2026-90156`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 17 Sept 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 17 Sept 2026, 16:06 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: `e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before aaa51ac0d934cb4e2ab96e150fccc934e822009b` (git)
  - affected: `e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before ecdcfa15b3d799476c685cecd433ebefc93015c8` (git)
  - affected: `e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before 77413400f083a959724de6f36348c9677ef9873a` (git)
  - affected: `e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before 52b91bc5253bb83665f3ea70565d0b2487dae643` (git)
  - affected: `e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before d09af9a35ff7b77a950b507133d9092aadbfeff4` (git)
  - affected: `e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before 054bcca4cd9f00719b01f7108b51a2168fb94f15` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.15`
  - unaffected: `before 5.15` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.114 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.57 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.6 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

No source has published a CVSS score for this record yet.

- **CISA KEV:** Not listed.
- **EPSS:** 0.0021, the 11th 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 17 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-90156](https://www.cve.org/CVERecord?id=CVE-2026-90156)
- [NVD: CVE-2026-90156](https://nvd.nist.gov/vuln/detail/CVE-2026-90156)

### References from the CNA

- <https://git.kernel.org/stable/c/aaa51ac0d934cb4e2ab96e150fccc934e822009b>
- <https://git.kernel.org/stable/c/ecdcfa15b3d799476c685cecd433ebefc93015c8>
- <https://git.kernel.org/stable/c/77413400f083a959724de6f36348c9677ef9873a>
- <https://git.kernel.org/stable/c/52b91bc5253bb83665f3ea70565d0b2487dae643>
- <https://git.kernel.org/stable/c/d09af9a35ff7b77a950b507133d9092aadbfeff4>
- <https://git.kernel.org/stable/c/054bcca4cd9f00719b01f7108b51a2168fb94f15>

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-2026-90156>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

---

The web page: <https://agentprime.io/advisories/CVE-2026-90156/>. Everything for agents: <https://agentprime.io/llms.txt>.