CVE-2026-90370 wifi: mt76: mt7996: bound TLV walk in mt7996_mcu_get_chip_config
A missing bounds check in the mt7996 WiFi driver allows a malicious firmware response to cause an infinite loop, hanging the CPU during device probe.
- 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-2026-90370?
CVE-2026-90370 is a denial of service 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: mt7996: bound TLV walk in mt7996_mcu_get_chip_config
The response TLV loop advanced by tlv->len without a minimum, so a theoretical firmware response containing a zero-length TLV could spin forever, hanging the CPU during device probe. The u32 payload was also read without bounds checking. Reject a short fixed field, stop on a TLV whose length underruns the header or overruns the skb.
Which versions are affected by CVE-2026-90370?
How do I fix CVE-2026-90370?
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-2026-90370 being exploited?
There is no known exploitation of CVE-2026-90370 in the wild and no public exploit code.
Sources
Also known as AZL-102938, BELL-CVE-2026-90370, DEBIAN-CVE-2026-90370, GHSA-mfm7-hr4m-cf88, UBUNTU-CVE-2026-90370.