CVE-2026-64223wifi: mac80211: consume only present negotiated TTLM maps
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 8f500fbc6c655976c8062b1f1e55bd0b3095d6c2 before f7d395dc5008168ac5b9c1ac2791e59a6078cca1; 8f500fbc6c655976c8062b1f1e55bd0b3095d6c2 builds before 2dd9304727c7041df0a599595910bdbe02ad03c5; 8f500fbc6c655976c8062b1f1e55bd0b3095d6c2 builds before 2becaaeebe230ade1fcd5d0f1cde4d6ee93ec78f; from 8f500fbc6c655976c8062b1f1e55bd0b3095d6c2 before a6e6ccd5bd07155c2add6c74ce1a5e68ad3b95ea | CNA record |
linux linux_kernel linux:linux_kernel | from 6.9 before 6.12.92; from 6.13 before 6.18.34; from 6.19 before 7.0.11; 7.1; 7.1; 7.1; 7.1 | NVD |
References
- https://git.kernel.org/stable/c/f7d395dc5008168ac5b9c1ac2791e59a6078cca1patch
- https://git.kernel.org/stable/c/2dd9304727c7041df0a599595910bdbe02ad03c5patch
- https://git.kernel.org/stable/c/2becaaeebe230ade1fcd5d0f1cde4d6ee93ec78fpatch
- https://git.kernel.org/stable/c/a6e6ccd5bd07155c2add6c74ce1a5e68ad3b95eapatch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.