CVE-2026-80933 wifi: mt76: mt7996: validate default EEPROM firmware size
A missing size check in the mt7996 WiFi driver allows a truncated EEPROM file to cause out-of-bounds reads, potentially crashing the system.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-80933?
CVE-2026-80933 is a high-severity denial of service 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: validate default EEPROM firmware size
The default EEPROM firmware is parsed and copied as a full EEPROM without checking its length. A truncated file can make the driver read beyond the firmware buffer during variant validation or the fallback copy.
Reject files shorter than MT7996_EEPROM_SIZE before parsing or copying the firmware.
Which versions are affected by CVE-2026-80933?
How do I fix CVE-2026-80933?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-80933 being exploited?
There is no known exploitation of CVE-2026-80933 in the wild and no public exploit code.
Sources
Also known as AZL-100734, BELL-CVE-2026-80933, DEBIAN-CVE-2026-80933, GHSA-2pcp-qx27-wf69, UBUNTU-CVE-2026-80933.