CVE-2026-64223
HighCVSS 8.1Exploitation Probability (EPSS)
Low risk17th percentile - higher than 17% of all known CVEs
Summary
In the Linux kernel's mac80211 subsystem, a vulnerability was found involving an out-of-bounds read when parsing negotiated TTLM maps. The bug occurs when the parser advances the cursor for every TID, even if it has no map, potentially reading past the validated element.
Risk Assessment
Potential risks include system crash or information disclosure, though direct policy change by an attacker is limited by the valid_links mechanism.
Recommendation
Immediately update the Linux kernel to a version containing the fix that advances the cursor only for TIDs with a present map.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: consume only present negotiated TTLM maps ieee80211_tid_to_link_map_size_ok() validates negotiated TTLM elements against the number of link-map entries indicated by link_map_presence. ieee80211_parse_neg_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 neg_ttlm->{up,down}link[tid] but are gated by valid_links 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.