wifi: mac80211: consume only present negotiated TTLM maps

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64223
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-24 16:16:50 UTC
Updated2026-07-24 16:16:50 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8f500fbc6c655976c8062b1f1e55bd0b3095d6c2 f7d395dc5008168ac5b9c1ac2791e59a6078cca1 git Not specified
CNA Linux Linux affected 8f500fbc6c655976c8062b1f1e55bd0b3095d6c2 2dd9304727c7041df0a599595910bdbe02ad03c5 git Not specified
CNA Linux Linux affected 8f500fbc6c655976c8062b1f1e55bd0b3095d6c2 2becaaeebe230ade1fcd5d0f1cde4d6ee93ec78f git Not specified
CNA Linux Linux affected 8f500fbc6c655976c8062b1f1e55bd0b3095d6c2 a6e6ccd5bd07155c2add6c74ce1a5e68ad3b95ea git Not specified
CNA Linux Linux affected 6.9 Not specified
CNA Linux Linux unaffected 6.9 semver Not specified
CNA Linux Linux unaffected 6.12.92 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.34 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.11 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/f7d395dc5008168ac5b9c1ac2791e59a6078cca1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a6e6ccd5bd07155c2add6c74ce1a5e68ad3b95ea 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2becaaeebe230ade1fcd5d0f1cde4d6ee93ec78f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2dd9304727c7041df0a599595910bdbe02ad03c5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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