CVE-2026-68311 wifi: mt76: mt7925: guard link STA in decap offload
A NULL pointer dereference in the Linux kernel mt7925 WiFi driver allows attackers to cause a system crash via crafted wireless traffic.
- 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-2026-68311?
CVE-2026-68311 is a vulnerability in Linux, published on 10 Aug 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: mt7925: guard link STA in decap offload
mt7925_sta_set_decap_offload() iterates over the vif valid_links mask when updating decap offload state for an MLO station. The station may not have a link STA for every valid link of the vif, so mt792x_sta_to_link() can return NULL for a link that belongs to the vif but not to the station.
The function currently dereferences mlink before checking whether the link WCID is ready. If mlink is NULL, setting or clearing MT_WCID_FLAG_HDR_TRANS dereferences a NULL pointer.
Skip links without a station link before touching mlink->wcid.
Which versions are affected by CVE-2026-68311?
How do I fix CVE-2026-68311?
Apply the vendor's patch.
Is CVE-2026-68311 being exploited?
There is no known exploitation of CVE-2026-68311 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-68311, DEBIAN-CVE-2026-68311, GHSA-r4m3-927r-4wxc, UBUNTU-CVE-2026-68311.