Linux kernel: mac80211 Deauth frame length validation
CVE-2026-98891 Published on October 23, 2026
wifi: mac80211: validate deauth frame length before reason access
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.
Products Associated with CVE-2026-98891
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Affected Versions
Linux:- Version c9c99f8938e41b878802d5d8481d6f7a212515b0 and below 51092dc769f021e9634474e1bd5a561da477fbdb is affected.
- Version c9c99f8938e41b878802d5d8481d6f7a212515b0 and below a6ed4c00ccdc15011a73daa2b38af9fc5a2c543e is affected.
- Version c9c99f8938e41b878802d5d8481d6f7a212515b0 and below 80d1a110e9096b5bf41497f6b151154084862385 is affected.
- Version c9c99f8938e41b878802d5d8481d6f7a212515b0 and below a78689e2beed200d4590318612c74ae25c9408cf is affected.
- Version c9c99f8938e41b878802d5d8481d6f7a212515b0 and below 7a5ef1fd654d0e90d59aa32c881789c8bcc4125a is affected.
- Version c9c99f8938e41b878802d5d8481d6f7a212515b0 and below 9df64ad43e1f2c036667bba2bf385e9d7b3af564 is affected.
- Version c9c99f8938e41b878802d5d8481d6f7a212515b0 and below 4a360c6e18dfa9d70006c7247a6a8cc8dfe0d60f is affected.
- Version 4.2 is affected.
- Before 4.2 is unaffected.
- Version 5.10.271, <= 5.10.* is unaffected.
- Version 5.15.222, <= 5.15.* is unaffected.
- Version 6.1.189, <= 6.1.* is unaffected.
- Version 6.6.158, <= 6.6.* is unaffected.
- Version 6.12.111, <= 6.12.* is unaffected.
- Version 6.18.53, <= 6.18.* is unaffected.
- Version 7.2, <= * is unaffected.