# smb: client: fix heap overflow in DACL owner/group rewrite

CVE record · `CVE-2026-97555`

- **Identifiers:** `CVE-2026-97555`
- **State:** Confirmed
- **Severity:** CVSS 8.8 High
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 25 Sept 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 25 Sept 2026, 10:21 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 4e78b5ff13214353750b87283ff79f62510f5844` (git)
  - affected: `bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 to before 63c2fbde15ffc9a0c21adf670c38d028e20fa65c` (git)
  - affected: `bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 to before d5cea6766ae1868a51c7d17d77d065b4f55c587f` (git)
  - affected: `bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 to before fb736ab4fb8c4fdb8b2f9ccd3a62e03d11549ca1` (git)
  - affected: `bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 to before 7fa84c9ca690643f429ae2709584a47e74b572c9` (git)
  - affected: `bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 to before 2a9aee9ef5622d58d8aafaa3263b3ffe70e2d9dd` (git)
  - affected: `bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 to before 0ee150794c75bcd0be0e24ff3394f433cbae18cc` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.12`
  - unaffected: `before 5.12` (semver)
  - unaffected: `5.15.224 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.158 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.111 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.53 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.7 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

- 8.8 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)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0058, the 48th percentile, on 12 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 25 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-97555](https://www.cve.org/CVERecord?id=CVE-2026-97555)
- [NVD: CVE-2026-97555](https://nvd.nist.gov/vuln/detail/CVE-2026-97555)

### References from the CNA

- <https://git.kernel.org/stable/c/4e78b5ff13214353750b87283ff79f62510f5844>
- <https://git.kernel.org/stable/c/63c2fbde15ffc9a0c21adf670c38d028e20fa65c>
- <https://git.kernel.org/stable/c/d5cea6766ae1868a51c7d17d77d065b4f55c587f>
- <https://git.kernel.org/stable/c/fb736ab4fb8c4fdb8b2f9ccd3a62e03d11549ca1>
- <https://git.kernel.org/stable/c/7fa84c9ca690643f429ae2709584a47e74b572c9>
- <https://git.kernel.org/stable/c/2a9aee9ef5622d58d8aafaa3263b3ffe70e2d9dd>
- <https://git.kernel.org/stable/c/0ee150794c75bcd0be0e24ff3394f433cbae18cc>

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-2026-97555>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-97555/>. Everything for agents: <https://agentprime.io/llms.txt>.