wifi: mt76: mt7996: fix out-of-bounds link array access in mt7996_tx()

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Summary

CVECVE-2026-90349
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:33 UTC
Updated2026-10-19 09:19:28 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7996: fix out-of-bounds link array access in mt7996_tx() When mac80211 leaves the link unspecified, mt7996_tx() substitutes the primary link id of the station or vif. That value is IEEE80211_LINK_UNSPECIFIED (0xf) until the first link has been added, and it is then used unchecked to index vif->link_conf[], mvif->mt76.link[] and sta->link[], all of which hold IEEE80211_MLD_MAX_NUM_LINKS (15) entries. Clamp the primary link id to the default link before using it, and use the clamped value for the link_sta fallback as well.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 1609b014aa29f9a2bf3aaa93f71de4a06725845e 637bb99cc766a858d744905e46638459ca128b6c git Not specified
CNA Linux Linux affected 1609b014aa29f9a2bf3aaa93f71de4a06725845e aff81505a84d27f83b4db8e039e813930cb23c2c git Not specified
CNA Linux Linux affected 1609b014aa29f9a2bf3aaa93f71de4a06725845e 4330a0ef9f75a54fde3548432a9a698f06bab635 git Not specified
CNA Linux Linux affected 6.18 Not specified
CNA Linux Linux unaffected 6.18 semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/aff81505a84d27f83b4db8e039e813930cb23c2c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4330a0ef9f75a54fde3548432a9a698f06bab635 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/637bb99cc766a858d744905e46638459ca128b6c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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