# ksmbd: free preauth sessions on connection teardown

CVE record · `CVE-2026-90169`

- **Identifiers:** `CVE-2026-90169`
- **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: `f5a544e3bab78142207e0242d22442db85ba1eff to before 1f60a88b2e0203e50f65b0fb9c32ecb0ae0aa683` (git)
  - affected: `f5a544e3bab78142207e0242d22442db85ba1eff to before effcf48d79d8aa53113d8289e140746f25ceb62c` (git)
  - affected: `f5a544e3bab78142207e0242d22442db85ba1eff to before b62b1ebb25f0a19067ed5b1a86036b2dc98be44f` (git)
  - affected: `f5a544e3bab78142207e0242d22442db85ba1eff to before a41a98ee16ae038751b6639decadaa3ce15ca18a` (git)
  - affected: `f5a544e3bab78142207e0242d22442db85ba1eff to before 8e2ebc77678832e981adc008d25cd8f67d08ebc4` (git)
  - affected: `f5a544e3bab78142207e0242d22442db85ba1eff to before 06c7b1d731bc105a8644f1b70165ba8b9416cbab` (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: `6.6.157 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.110 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.52 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:** 0.0025, the 16th 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-2026-90169](https://www.cve.org/CVERecord?id=CVE-2026-90169)
- [NVD: CVE-2026-90169](https://nvd.nist.gov/vuln/detail/CVE-2026-90169)

### References from the CNA

- <https://git.kernel.org/stable/c/1f60a88b2e0203e50f65b0fb9c32ecb0ae0aa683>
- <https://git.kernel.org/stable/c/effcf48d79d8aa53113d8289e140746f25ceb62c>
- <https://git.kernel.org/stable/c/b62b1ebb25f0a19067ed5b1a86036b2dc98be44f>
- <https://git.kernel.org/stable/c/a41a98ee16ae038751b6639decadaa3ce15ca18a>
- <https://git.kernel.org/stable/c/8e2ebc77678832e981adc008d25cd8f67d08ebc4>
- <https://git.kernel.org/stable/c/06c7b1d731bc105a8644f1b70165ba8b9416cbab>

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-2026-90169>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-90169/>. Everything for agents: <https://agentprime.io/llms.txt>.