wifi: mac80211: consume only present negotiated TTLM maps

Summary

CVE	CVE-2026-64223
State	PUBLISHED
Assigner	Linux
Source Priority	CVE Program / NVD first with legacy fallback
Published	2026-07-24 16:16:50 UTC
Updated	2026-10-19 21:17:27 UTC
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.

Primary CVSS: v3.1 8.1 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

EPSS: 0.002560000 probability, percentile 0.172640000 (date 2026-08-03)

Problem Types: CWE-125 | CWE-125 CWE-125 Out-of-bounds Read

Version	Source	Type	Score	Severity	Vector
3.1	416baaa9-dc9f-4396-8d5f-8c081fb06d67	Secondary	8.1	HIGH	`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H`
3.1	CNA	DECLARED	8.1	HIGH	`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H`

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Type	Vendor	Product	Version	Update	Edition	Language
Operating System	Linux	Linux Kernel	All	All	All	All

Source	Vendor	Product	Version	Platforms
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

Reference	Source	Link	Tags
git.kernel.org/stable/c/f7d395dc5008168ac5b9c1ac2791e59a6078cca1	416baaa9-dc9f-4396-8d5f-8c081fb06d67	git.kernel.org	Patch
git.kernel.org/stable/c/a6e6ccd5bd07155c2add6c74ce1a5e68ad3b95ea	416baaa9-dc9f-4396-8d5f-8c081fb06d67	git.kernel.org	Patch
git.kernel.org/stable/c/2becaaeebe230ade1fcd5d0f1cde4d6ee93ec78f	416baaa9-dc9f-4396-8d5f-8c081fb06d67	git.kernel.org	Patch
git.kernel.org/stable/c/2dd9304727c7041df0a599595910bdbe02ad03c5	416baaa9-dc9f-4396-8d5f-8c081fb06d67	git.kernel.org	Patch
CVE Program record	CVE.ORG	www.cve.org	canonical
NVD vulnerability detail	NVD	nvd.nist.gov	canonical, analysis

No vendor comments have been submitted for this CVE.

There are currently no legacy QID mappings associated with this CVE.