CVE-2026-80935 wifi: mt76: mt7996: bound the device EEPROM address before the EFUSE copy
A malicious WiFi device can trigger an out-of-bounds write in the mt7996 driver, potentially allowing code execution or privilege escalation.
- 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-2026-80935?
CVE-2026-80935 is a high-severity memory corruption vulnerability in Linux, published on 11 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: mt7996: bound the device EEPROM address before the EFUSE copy
mt7996_mcu_get_eeprom() derives the destination of the EFUSE/EXT block copy from the address reported by the MCU response (event->addr, a device-controlled __le32) and clamps only the copy length, never the destination offset into dev->mt76.eeprom.data. A malicious or malfunctioning device can report an arbitrary address and drive an out-of-bounds write of up to MT7996_EXT_EEPROM_BLOCK_SIZE bytes past eeprom.data.
Reject a response whose address would place the copy outside eeprom.data before deriving the destination pointer. Devices that echo the requested in-bounds offset are unaffected.
Which versions are affected by CVE-2026-80935?
How do I fix CVE-2026-80935?
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-2026-80935 being exploited?
There is no known exploitation of CVE-2026-80935 in the wild and no public exploit code.
Sources
Also known as AZL-100748, BELL-CVE-2026-80935, DEBIAN-CVE-2026-80935, GHSA-gmwf-mx64-6gvq, UBUNTU-CVE-2026-80935.