CVE-2026-64223

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> wifi: mac80211: consume only present negotiated TTLM maps<br /> <br /> ieee80211_tid_to_link_map_size_ok() validates negotiated TTLM elements<br /> against the number of link-map entries indicated by link_map_presence.<br /> ieee80211_parse_neg_ttlm() must consume the same layout.<br /> <br /> The parser advanced its cursor for every TID, including TIDs whose<br /> presence bit is clear and therefore have no map bytes in the element.<br /> A sparse map can then make a later present TID read past the validated<br /> element.<br /> <br /> The bad bytes land in neg_ttlm-&gt;{up,down}link[tid] but are gated by<br /> valid_links before being applied to driver state, so a peer cannot<br /> turn the read into a policy change. Under KUnit + KASAN with an<br /> exact-sized element allocation the OOB read is reported as a<br /> slab-out-of-bounds; whether the same trigger fires under the<br /> production RX path depends on surrounding allocator state.<br /> <br /> Advance the cursor only when the current TID has a map present.