# cxl/mbox: Clamp mailbox output allocation to the payload size

CVE record · `CVE-2026-93186`

- **Identifiers:** `CVE-2026-93186`
- **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, 16:12 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: `583fa5e71caeb79e04e477e9837e2f7fa53b71e4 to before 123f6d154253939ce38f0ec0b6d1ba67f870e01f` (git)
  - affected: `583fa5e71caeb79e04e477e9837e2f7fa53b71e4 to before d2d40574b9b272ade32d0d77b140d990e7547f5f` (git)
  - affected: `583fa5e71caeb79e04e477e9837e2f7fa53b71e4 to before f5d2bbf0300f46307948864fbb97bce5097f4fe2` (git)
  - affected: `583fa5e71caeb79e04e477e9837e2f7fa53b71e4 to before 31d4841eca7c4b75751ca96d24339e19303337f2` (git)
  - affected: `583fa5e71caeb79e04e477e9837e2f7fa53b71e4 to before b4e11c731d6bee3b87315e055a1ca417c92dc1fc` (git)
  - affected: `583fa5e71caeb79e04e477e9837e2f7fa53b71e4 to before 8a13db9f899d149c3aab24abcb668121cfda5a4f` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.12`
  - unaffected: `before 5.12` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 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:** 0.0020, the 9th percentile, on 14 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-2026-93186](https://www.cve.org/CVERecord?id=CVE-2026-93186)
- [NVD: CVE-2026-93186](https://nvd.nist.gov/vuln/detail/CVE-2026-93186)

### References from the CNA

- <https://git.kernel.org/stable/c/123f6d154253939ce38f0ec0b6d1ba67f870e01f>
- <https://git.kernel.org/stable/c/d2d40574b9b272ade32d0d77b140d990e7547f5f>
- <https://git.kernel.org/stable/c/f5d2bbf0300f46307948864fbb97bce5097f4fe2>
- <https://git.kernel.org/stable/c/31d4841eca7c4b75751ca96d24339e19303337f2>
- <https://git.kernel.org/stable/c/b4e11c731d6bee3b87315e055a1ca417c92dc1fc>
- <https://git.kernel.org/stable/c/8a13db9f899d149c3aab24abcb668121cfda5a4f>

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-2026-93186>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-93186/>. Everything for agents: <https://agentprime.io/llms.txt>.