Linux vulnerability

What happened

In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: Fix memory leak after mt76_connac_mcu_alloc_sta_req() mt76_connac_mcu_alloc_sta_req() allocates an skb which is expected to be freed eventually by mt76_mcu_skb_send_msg(). However, currently if an intermediate function fails before sending, the allocated skb is leaked. Specifically, mt76_connac_mcu_sta_wed_update() and mt76_connac_mcu_sta_key_tlv() may fail, leading to an immediate memory leak in the error path. Fix this by explicitly freeing the skb in these error paths. Commit 7c0f63fe37a5 ("wifi: mt76: mt7996: fix memory leak on mt7996_mcu_sta_key_tlv error") made a similar change. Compile tested only. Issue found using a prototype static analysis tool and code review.

Affected versions

Linux: 6683d988089ce0e80bd859a9493333b6b272420e through before 7de35b99503012e57bec027e98ed53f881518b5b (git); 6683d988089ce0e80bd859a9493333b6b272420e through before 8527ac1bce87aaabde6755e8e6eb2a9f439d1292 (git); 6683d988089ce0e80bd859a9493333b6b272420e through before eb466406d2094deefadc2cd6ddb4f6eeb086d1b4 (git); 6683d988089ce0e80bd859a9493333b6b272420e through before c41075ce8cf05ed8c0e7b7efef000dce548ffc42 (git); 5.18 Fixed: See vendor advisory.

Why it matters

Review the vendor advisory and exposure of the affected product to determine operational impact.

Detection & mitigation

• Apply vendor-provided updates or mitigations.
• Review affected product exposure and access logs.