# ksmbd: bound smb_check_perm_dacl() ACE walks by DACL size

CVE record · `CVE-2026-90153`

- **Identifiers:** `CVE-2026-90153`
- **State:** Confirmed
- **Severity:** CVSS 8.1 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, 16:06 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: `8f0541186e9ad1b62accc9519cc2b7a7240272a7 to before 930dcdd888eabf166589e020dcbf6d15b5e13305` (git)
  - affected: `8f0541186e9ad1b62accc9519cc2b7a7240272a7 to before a2051ffe452afad52f580b85a3fd8851933b1e7c` (git)
  - affected: `8f0541186e9ad1b62accc9519cc2b7a7240272a7 to before a29f57a14c939586d84d7fd6a029bd1fd170098f` (git)
  - affected: `8f0541186e9ad1b62accc9519cc2b7a7240272a7 to before a4a307d149327dad5fb25187e1b03cebd1b04de6` (git)
  - affected: `8f0541186e9ad1b62accc9519cc2b7a7240272a7 to before 8e4f75e979c1d9a51b0a48ac33d0cfd5f039ec67` (git)
  - affected: `8f0541186e9ad1b62accc9519cc2b7a7240272a7 to before 79decd88dd3f0d42e7fb0689b1a7853bfa302459` (git)
  - affected: `cb69d4d6f709f87c94afa28ae64c501576692171` (git)
  - affected: `6e8f4abf584253cbaa596ea4ad13110cf61cd4c9` (git)
  - affected: `8e33102309bd6839b2e2e158f93a7b378cb4655d` (git)
  - affected: `5.15.62 to before 5.16` (semver)
  - affected: `5.18.18 to before 5.19` (semver)
  - affected: `5.19.2 to before 5.20` (semver)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.0`
  - unaffected: `before 6.0` (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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0052, the 44th 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-2026-90153](https://www.cve.org/CVERecord?id=CVE-2026-90153)
- [NVD: CVE-2026-90153](https://nvd.nist.gov/vuln/detail/CVE-2026-90153)

### References from the CNA

- <https://git.kernel.org/stable/c/930dcdd888eabf166589e020dcbf6d15b5e13305>
- <https://git.kernel.org/stable/c/a2051ffe452afad52f580b85a3fd8851933b1e7c>
- <https://git.kernel.org/stable/c/a29f57a14c939586d84d7fd6a029bd1fd170098f>
- <https://git.kernel.org/stable/c/a4a307d149327dad5fb25187e1b03cebd1b04de6>
- <https://git.kernel.org/stable/c/8e4f75e979c1d9a51b0a48ac33d0cfd5f039ec67>
- <https://git.kernel.org/stable/c/79decd88dd3f0d42e7fb0689b1a7853bfa302459>

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-2026-90153>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-90153/>. Everything for agents: <https://agentprime.io/llms.txt>.