CVE-2026-90376 wifi: mt76: mt7996: fix MLD ID in MAC TXD and HIF TXP
A flaw in the Linux kernel mt7996 WiFi driver causes a firmware busy loop and MCU timeout when handling frames for a third link in power saving mode.
- 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-2026-90376?
CVE-2026-90376 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: fix MLD ID in MAC TXD and HIF TXP
Problem: MCU command timeout while the firmware state is normal, and the firmware keeps showing the error log "ERROR!! NO PAUSE...".
Root cause: If the MLD_ID field in the TXD is neither the primary link id nor the secondary link id, it may lead to a firmware busy loop when the third link is in power saving mode.
Remap frames directed to a third link to the primary link wcid. Since TX status events and txfree completions carry the wcid the firmware saw, use the remapped wcid for packet id tracking and non-AQL packet accounting as well, while the frame keeps its original link context for addressing, band and OMAC selection.
Which versions are affected by CVE-2026-90376?
How do I fix CVE-2026-90376?
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-2026-90376 being exploited?
There is no known exploitation of CVE-2026-90376 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-90376, GHSA-6ch6-r62g-8chc, UBUNTU-CVE-2026-90376.