CVE-2026-90373

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

wifi: mt76: mt7915: clear wcid mask under mutex after RCU pointer clear

mt7915_remove_interface() cleared the wcid mask bit with no lock held and

before clearing the RCU wcid pointer. The mask is a non-atomic RMW shared

with the allocators, which all run under dev->mt76.mutex; on DBDC the two

wiphys share one mt76_dev, so this raced add_interface/sta_add on the

other band and could leak or double-hand-out a wcid. Clearing the bit

before the RCU pointer also let a concurrent allocation reuse the index

and publish its wcid, which the subsequent NULL assignment then wiped.

Move the clear into the existing mutex section, after the RCU pointer is

cleared.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References