CVE-2026-90350 wifi: mt76: reject out-of-range link ids in mt76_vif_link()
An out-of-bounds read in the mt76 WiFi driver allows attackers to access adjacent memory or cause a crash via crafted link IDs.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-90350?
CVE-2026-90350 is a memory corruption vulnerability in Linux, published on 17 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
wifi: mt76: reject out-of-range link ids in mt76_vif_link()
mt76_vif_link() indexes mvif->link[] without validating link_id, but callers pass mvif->deflink_id / msta->deflink_id, which hold IEEE80211_LINK_UNSPECIFIED (0xf) until the first link has been added. Since IEEE80211_MLD_MAX_NUM_LINKS is 15, that reads one element past the end of the array, aliasing mt76_vif_data.offchannel_link.
Reachable via mt7996_set_tsf()/mt7996_offset_tsf() and mt7996_net_fill_forward_path(). Bounds check link_id and return NULL, matching mt7996_sta_link() and mt7996_sta_link_protected().
Which versions are affected by CVE-2026-90350?
How do I fix CVE-2026-90350?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-90350 being exploited?
There is no known exploitation of CVE-2026-90350 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-90350, DEBIAN-CVE-2026-90350, GHSA-2wwg-wpch-pp6g, UBUNTU-CVE-2026-90350.