CVE-2026-64223

In the Linux kernel, the following vulnerability has been resolved:

wifi: mac80211: consume only present negotiated TTLM maps

ieee80211tidtolinkmapsizeok() validates negotiated TTLM elements against the number of link-map entries indicated by linkmappresence. ieee80211parseneg_ttlm() must consume the same layout.

The parser advanced its cursor for every TID, including TIDs whose presence bit is clear and therefore have no map bytes in the element. A sparse map can then make a later present TID read past the validated element.

The bad bytes land in negttlm->{up,down}link[tid] but are gated by validlinks before being applied to driver state, so a peer cannot turn the read into a policy change. Under KUnit + KASAN with an exact-sized element allocation the OOB read is reported as a slab-out-of-bounds; whether the same trigger fires under the production RX path depends on surrounding allocator state.

Advance the cursor only when the current TID has a map present.