SB20260918299 - Race condition in Linux kernel mediatek mt76 driver

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-90371)

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

CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to trigger a buffer recycling race.

The vulnerability exists due to a race condition in RXDMAD_C buffer recycling in the mt76 DMA code when processing buffers from RRO data queues. A local user can trigger RXDMAD_C buffer processing to trigger a buffer recycling race.

The relevant RRO data-queue page pools are bound to a different NAPI context.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/7ac05ed3a50e511c93f8506e555709a208dfce0a
• https://git.kernel.org/stable/c/a273dc3b86a7d983d643827d3d3c795d55d8f632
• https://git.kernel.org/stable/c/e1f97c10a4ec2b9db69a134b757304399ca903ce