# HID: mcp2221: validate report size in mcp2221_raw_event()

CVE record · `CVE-2026-89621`

- **Identifiers:** `CVE-2026-89621`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 11 Sept 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 11 Sept 2026, 19:45 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: `67a95c21463d066060b0f66d65a75d45bb386ffb to before cb38b1f149b7143355b37e86c841acf0076e5c2a` (git)
  - affected: `67a95c21463d066060b0f66d65a75d45bb386ffb to before b2c67dc0e30c308647bbd9b9e5d69a44c9d2733d` (git)
  - affected: `67a95c21463d066060b0f66d65a75d45bb386ffb to before fffcfa367072628c3144cca17d2a3c3c9e50c057` (git)
  - affected: `67a95c21463d066060b0f66d65a75d45bb386ffb to before c1c508e8923911cb458234997e55b7a4b9aa066f` (git)
  - affected: `67a95c21463d066060b0f66d65a75d45bb386ffb to before bdc6a3af0dd734a326acdb7d6401a3b6a9f4f149` (git)
  - affected: `67a95c21463d066060b0f66d65a75d45bb386ffb to before 127de5919820f88a9d55e8371ad4ac49f625f4c5` (git)
  - affected: `67a95c21463d066060b0f66d65a75d45bb386ffb to before 7c18fb36708a97ff6772825cc087b6d537bbf0d5` (git)
  - affected: `67a95c21463d066060b0f66d65a75d45bb386ffb to before 2c9a6998c19503626c57a2267bf279e204113079` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.7`
  - unaffected: `before 5.7` (semver)
  - unaffected: `5.10.270 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.221 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.188 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.157 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.109 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.50 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.4 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:** 0.0022, the 12th 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 11 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-89621](https://www.cve.org/CVERecord?id=CVE-2026-89621)
- [NVD: CVE-2026-89621](https://nvd.nist.gov/vuln/detail/CVE-2026-89621)

### References from the CNA

- <https://git.kernel.org/stable/c/cb38b1f149b7143355b37e86c841acf0076e5c2a>
- <https://git.kernel.org/stable/c/b2c67dc0e30c308647bbd9b9e5d69a44c9d2733d>
- <https://git.kernel.org/stable/c/fffcfa367072628c3144cca17d2a3c3c9e50c057>
- <https://git.kernel.org/stable/c/c1c508e8923911cb458234997e55b7a4b9aa066f>
- <https://git.kernel.org/stable/c/bdc6a3af0dd734a326acdb7d6401a3b6a9f4f149>
- <https://git.kernel.org/stable/c/127de5919820f88a9d55e8371ad4ac49f625f4c5>
- <https://git.kernel.org/stable/c/7c18fb36708a97ff6772825cc087b6d537bbf0d5>
- <https://git.kernel.org/stable/c/2c9a6998c19503626c57a2267bf279e204113079>

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-2026-89621>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89621/>. Everything for agents: <https://agentprime.io/llms.txt>.