CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's handling of negotiated TTLM (Traffic Type Link Map) elements within the mac80211 subsystem, specifically in the ieee80211_tid_to_link_map_size_ok() and ieee80211_parse_neg_ttlm() functions. An attacker could exploit this flaw to cause an out-of-bounds read, potentially leading to information disclosure or instability, although it does not directly allow for policy changes in the driver state. Organizations using Linux-based systems, particularly those relying on wireless networking, should prioritize patching this vulnerability to mitigate potential risks.
Original NVD Description
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.
Related CVEs
Other vulnerabilities affecting the same vendor(s)