SB20260918301 - Race condition in Linux kernel mt76 mt7915 driver

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-90373)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause resource allocation inconsistencies.

The vulnerability exists due to a race condition in the mt7915_remove_interface() function when concurrently removing an interface while allocating wireless client identifiers on another band. A local user can trigger concurrent interface removal and wireless client identifier allocation to cause resource allocation inconsistencies.

The issue occurs on DBDC devices, where two wiphys share one mt76_dev instance.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/5dce25f1d609ba991a9c22c27be586c92f03ed77
• https://git.kernel.org/stable/c/6486e11a6e2f679597af2d5bb48c3b07a2b2a7ba
• https://git.kernel.org/stable/c/a97b2b942d2f8f12fbd6a7caafc735d1ad115e6b
• https://git.kernel.org/stable/c/b4a41a47a67c788e6b0625fa517ec8872e99bb6c