wifi: mac80211: keep fallback association elements alive

Summary

In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: keep fallback association elements alive Associating to a non-transmitted MBSSID profile reads freed memory while determining the operating channel and applying HT capabilities. When an association response omits WMM, HT, or VHT information, ieee80211_assoc_config_link() parses the cached BSS IEs and copies the missing element pointers out of that fallback parse. For a non-transmitted MBSSID profile those pointers refer to merged-profile storage owned by the parse object, and the fallback block frees that object at its end. The copied pointers are used afterwards to determine the operating channel, configure bandwidth, and apply HT capabilities. Keep the fallback parse result alive until association setup finishes. [reorder variable declaration]

Timeline

1. Oct 18, 2026, 3:46 PM UTCCVE published
2. Oct 21, 2026, 12:55 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 5023b14cf4df4d22e1a80738167f3438c9e62e5f · fixed in de77b0f68142147e74fac1c497dbe1f93daeeed9; From 5023b14cf4df4d22e1a80738167f3438c9e62e5f · fixed in 1d9644753d46c86b4e5c05bd6d9d35339ea27331; From 5023b14cf4df4d22e1a80738167f3438c9e62e5f · fixed in d0183cd1f6a2dba9e63be20af2f65093c9c8d121; From 5023b14cf4df4d22e1a80738167f3438c9e62e5f · fixed in 0878594c5806dd29fa5e16cc026ce19158afdad2; From 5023b14cf4df4d22e1a80738167f3438c9e62e5f · fixed in a10a2f80476d166fd81c361ec0319493671b694e

• Linux Linux

  5.2

• KernelLinux

  From 5.2.0 · fixed in 6.6.160; From 6.7.0 · fixed in 6.12.113; From 6.13.0 · fixed in 6.18.56; From 6.19.0 · fixed in 7.2.10

References 5