# wifi: mac80211: validate deauth frame length before reason access

CVE record · `CVE-2026-98891`

- **Identifiers:** `CVE-2026-98891`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 23 Oct 2026
- **Updated:** 26 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 23 Oct 2026, 11:37 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: `c9c99f8938e41b878802d5d8481d6f7a212515b0 to before 51092dc769f021e9634474e1bd5a561da477fbdb` (git)
  - affected: `c9c99f8938e41b878802d5d8481d6f7a212515b0 to before a6ed4c00ccdc15011a73daa2b38af9fc5a2c543e` (git)
  - affected: `c9c99f8938e41b878802d5d8481d6f7a212515b0 to before 80d1a110e9096b5bf41497f6b151154084862385` (git)
  - affected: `c9c99f8938e41b878802d5d8481d6f7a212515b0 to before a78689e2beed200d4590318612c74ae25c9408cf` (git)
  - affected: `c9c99f8938e41b878802d5d8481d6f7a212515b0 to before 7a5ef1fd654d0e90d59aa32c881789c8bcc4125a` (git)
  - affected: `c9c99f8938e41b878802d5d8481d6f7a212515b0 to before 9df64ad43e1f2c036667bba2bf385e9d7b3af564` (git)
  - affected: `c9c99f8938e41b878802d5d8481d6f7a212515b0 to before 4a360c6e18dfa9d70006c7247a6a8cc8dfe0d60f` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.2`
  - unaffected: `before 4.2` (semver)
  - unaffected: `5.10.271 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.222 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.189 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 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:** 0.0018, the 7th percentile, on 7 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 23 Oct 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-98891](https://www.cve.org/CVERecord?id=CVE-2026-98891)
- [NVD: CVE-2026-98891](https://nvd.nist.gov/vuln/detail/CVE-2026-98891)

### References from the CNA

- <https://git.kernel.org/stable/c/51092dc769f021e9634474e1bd5a561da477fbdb>
- <https://git.kernel.org/stable/c/a6ed4c00ccdc15011a73daa2b38af9fc5a2c543e>
- <https://git.kernel.org/stable/c/80d1a110e9096b5bf41497f6b151154084862385>
- <https://git.kernel.org/stable/c/a78689e2beed200d4590318612c74ae25c9408cf>
- <https://git.kernel.org/stable/c/7a5ef1fd654d0e90d59aa32c881789c8bcc4125a>
- <https://git.kernel.org/stable/c/9df64ad43e1f2c036667bba2bf385e9d7b3af564>
- <https://git.kernel.org/stable/c/4a360c6e18dfa9d70006c7247a6a8cc8dfe0d60f>

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-2026-98891>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-98891/>. Everything for agents: <https://agentprime.io/llms.txt>.