# smb: client: validate the whole DACL before rewriting it in cifsacl

CVE record · `CVE-2026-31709`

- **Identifiers:** `CVE-2026-31709`
- **State:** Confirmed
- **Severity:** CVSS 8.8 High
- **Critical:** No
- **CNA:** Linux
- **Weakness (CWE):** [CWE-125](https://cwe.mitre.org/data/definitions/125.html) · [CWE-1288](https://cwe.mitre.org/data/definitions/1288.html)
- **Tags:** [Memory corruption](https://agentprime.io/advisories/tag/memory-corruption.md) · [CWE-1288](https://agentprime.io/advisories/tag/cwe-1288.md)
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 1 May 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 1 May 2026, 13:56 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: `bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 to before b8603d9ae6c9087662b098619996bc4a8064319d` (git)
  - affected: `bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 to before c2abdebf72000a64603ced84d36ccbd164f11391` (git)
  - affected: `bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 to before 8e47d297e7cf9a6029a0d38e7b22faba7d7aaf12` (git)
  - affected: `bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 to before d92f3f0b22414e7515696a02224d0af55e3004a3` (git)
  - affected: `bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 to before ff0ca46b13b9ef6edbcd238a3b6caacfef8ba0e5` (git)
  - affected: `bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 to before b78db9bddc84136f6a0bb49e8883cf200dfb87a8` (git)
  - affected: `bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 to before 0a8cf165566ba55a39fd0f4de172119dd646d39a` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.12`
  - unaffected: `before 5.12` (semver)
  - unaffected: `5.15.210 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.176 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.140 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.86 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.35 to 6.18.*, inclusive` (semver)
  - unaffected: `7.0.2 to 7.0.*, inclusive` (semver)
  - unaffected: `7.1 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

- 8.8 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`, from CNA (Linux) (used for this record)
- 7.8 High, CVSS 3.1: `CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`, from ADP (redhat-SADP)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0034, the 28th percentile, on 6 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 1 May 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-31709](https://www.cve.org/CVERecord?id=CVE-2026-31709)
- [NVD: CVE-2026-31709](https://nvd.nist.gov/vuln/detail/CVE-2026-31709)

### References from the CNA

- <https://git.kernel.org/stable/c/b8603d9ae6c9087662b098619996bc4a8064319d>
- <https://git.kernel.org/stable/c/c2abdebf72000a64603ced84d36ccbd164f11391>
- <https://git.kernel.org/stable/c/8e47d297e7cf9a6029a0d38e7b22faba7d7aaf12>
- <https://git.kernel.org/stable/c/d92f3f0b22414e7515696a02224d0af55e3004a3>
- <https://git.kernel.org/stable/c/ff0ca46b13b9ef6edbcd238a3b6caacfef8ba0e5>
- <https://git.kernel.org/stable/c/b78db9bddc84136f6a0bb49e8883cf200dfb87a8>
- <https://git.kernel.org/stable/c/0a8cf165566ba55a39fd0f4de172119dd646d39a>

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-2026-31709>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-31709/>. Everything for agents: <https://agentprime.io/llms.txt>.