CVE-2026-90349

Summary

In 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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux1609b014aa29f9a2bf3aaa93f71de4a06725845e < 637bb99cc766a858d744905e46638459ca128b6caffected
LinuxLinux1609b014aa29f9a2bf3aaa93f71de4a06725845e < aff81505a84d27f83b4db8e039e813930cb23c2caffected
LinuxLinux1609b014aa29f9a2bf3aaa93f71de4a06725845e < 4330a0ef9f75a54fde3548432a9a698f06bab635affected
LinuxLinux6.18affected
LinuxLinux0 < 6.18unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References