CVE-2026-64223 is a vulnerability in Linux Kernel
Published on July 24, 2026
wifi: mac80211: consume only present negotiated TTLM maps
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.
Products Associated with CVE-2026-64223
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Affected Versions
Linux:- Version 8f500fbc6c655976c8062b1f1e55bd0b3095d6c2 and below f7d395dc5008168ac5b9c1ac2791e59a6078cca1 is affected.
- Version 8f500fbc6c655976c8062b1f1e55bd0b3095d6c2 and below 2dd9304727c7041df0a599595910bdbe02ad03c5 is affected.
- Version 8f500fbc6c655976c8062b1f1e55bd0b3095d6c2 and below 2becaaeebe230ade1fcd5d0f1cde4d6ee93ec78f is affected.
- Version 8f500fbc6c655976c8062b1f1e55bd0b3095d6c2 and below a6e6ccd5bd07155c2add6c74ce1a5e68ad3b95ea is affected.
- Version 6.9 is affected.
- Before 6.9 is unaffected.
- Version 6.12.92, <= 6.12.* is unaffected.
- Version 6.18.34, <= 6.18.* is unaffected.
- Version 7.0.11, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.