CVE-2026-98891
Published Oct 23, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: validate deauth frame length before reason access ieee80211_rx_mgmt_deauth() reads the deauth reason code before checking that the fixed field is actually present in the received frame. Validate the deauth frame length first and only then read the reason code.
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References
Other References
https://git.kernel.org/stable/c/4a360c6e18dfa9d70006c7247a6a8cc8dfe0d60f
https://git.kernel.org/stable/c/51092dc769f021e9634474e1bd5a561da477fbdb
https://git.kernel.org/stable/c/7a5ef1fd654d0e90d59aa32c881789c8bcc4125a
https://git.kernel.org/stable/c/80d1a110e9096b5bf41497f6b151154084862385
https://git.kernel.org/stable/c/9df64ad43e1f2c036667bba2bf385e9d7b3af564
https://git.kernel.org/stable/c/a6ed4c00ccdc15011a73daa2b38af9fc5a2c543e
https://git.kernel.org/stable/c/a78689e2beed200d4590318612c74ae25c9408cf
Frequently Asked Questions
What is CVE-2026-98891? +
In the Linux kernel, the following vulnerability has been resolved:
wifi: mac80211: validate deauth frame length before reason access
ieee80211_rx_mgmt_deauth() reads the deauth reason code before checking
that the fixed field is actually present in the received frame.
Validate the deauth frame length first and only then read the reason
code.
How do I check if I'm vulnerable to CVE-2026-98891? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.