wifi: mwifiex: validate scan response extents

Summary

In the Linux kernel, the following vulnerability has been resolved: wifi: mwifiex: validate scan response extents mwifiex_ret_802_11_scan() subtracts the fixed response fields and the firmware-provided BSS length from resp->size without first proving that either extent fits. A short response or oversized BSS length can therefore underflow tlv_buf_size and make the TLV parser walk beyond the command response. Compute the fixed extent from the selected normal or background scan response. Validate that the fixed fields and BSS data fit before deriving the TLV extent and entering the parser.

Timeline

1. Oct 6, 2026, 8:44 AM UTCCVE published
2. Oct 19, 2026, 9:15 AM UTCRecord last updated

Affected versions

• Linux Linux

  From 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e · fixed in 25217c5f6ce0bf3004f80c129464cd35fe9a420f; From 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e · fixed in 48312f0085aa1577d6d41af2a079b34de17c1a57; From 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e · fixed in dccf5ecaad4d8d43c545921f20328e8f91af8698; From 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e · fixed in c4943323fda22ef27bb6479b9d328ae48c63f64c; From 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e · fixed in cb0008480ed7d5cf76f3ad9668a91bbb7d0b4417; From 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e · fixed in 9cff2f39ed38a32070b08364c4c9346e85b8f9ec; From 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e · fixed in 7106ad8b74f50cca1ef36131f327d2c78f556daa; From 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e · fixed in 3687d7d48070838cc2953431b3a27717cab0aaf6

• Linux Linux

  3.0

• KernelLinux

  From 3.0.0 · fixed in 5.10.271; From 5.11.0 · fixed in 5.15.222; From 5.16.0 · fixed in 6.1.189; From 6.2.0 · fixed in 6.6.158; From 6.7.0 · fixed in 6.12.112; From 6.13.0 · fixed in 6.18.54; From 6.19.0 · fixed in 7.2.8

References 8