# ksmbd: fix slab-out-of-bounds read in ksmbd_alloc_user()

CVE record · `CVE-2026-90174`

- **Identifiers:** `CVE-2026-90174`
- **State:** Confirmed
- **Severity:** CVSS 7.1 High
- **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, 16:07 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 792dd35013427995e742c7928ef5b564434a4321` (git)
  - affected: `e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before 67223b1150a9edea52350d8cd085ea9081beaa45` (git)
  - affected: `e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before 863f74ad158fef2987b9146f29d4b3149bb95953` (git)
  - affected: `e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before 272c05a51285fe3495ab2f7eb77a48ad831b929f` (git)
  - affected: `e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before 497c221bf6b2f659511719a6acfae84cc1be1caf` (git)
  - affected: `e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before 7405d0ba294306721843bc551611775e6edef516` (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

- 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:** 0.0017, the 5th 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-2026-90174](https://www.cve.org/CVERecord?id=CVE-2026-90174)
- [NVD: CVE-2026-90174](https://nvd.nist.gov/vuln/detail/CVE-2026-90174)

### References from the CNA

- <https://git.kernel.org/stable/c/792dd35013427995e742c7928ef5b564434a4321>
- <https://git.kernel.org/stable/c/67223b1150a9edea52350d8cd085ea9081beaa45>
- <https://git.kernel.org/stable/c/863f74ad158fef2987b9146f29d4b3149bb95953>
- <https://git.kernel.org/stable/c/272c05a51285fe3495ab2f7eb77a48ad831b929f>
- <https://git.kernel.org/stable/c/497c221bf6b2f659511719a6acfae84cc1be1caf>
- <https://git.kernel.org/stable/c/7405d0ba294306721843bc551611775e6edef516>

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-2026-90174>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

---

The web page: <https://agentprime.io/advisories/CVE-2026-90174/>. Everything for agents: <https://agentprime.io/llms.txt>.