CVE-2026-80936

Received Received - Intake

mt7925 Workqueue Use-After-Free in Linux Kernel

Publication date: 2026-09-11

Last updated on: 2026-09-11

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7925: cancel mlo_pm_work on stop mt7925 queues mlo_pm_work with a 5 second delay during multi-link power-save setup and never cancels it on the stop path. If the device is torn down inside that window, the work outlives the teardown and its timer fires afterwards, trying to queue onto the workqueue that is already gone: workqueue: cannot queue mt7925_mlo_pm_work [mt7925_common] on wq phy0 WARNING: kernel/workqueue.c:2283 at __queue_work+0x59/0xa0, CPU#1: swapper/1/0 call_timer_fn+0x2a/0x140 __run_timers+0x203/0x330 run_timer_softirq+0x86/0xf0 mt7921 already has its own stop callback, so add one for mt7925 that cancels the work before calling mt792x_stop(). mt7925_ops backs both the PCIe and USB drivers, so this covers both.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-11

Last Modified

2026-09-11

Generated

2026-09-12

AI Q&A

2026-09-12

EPSS Evaluated

N/A

NVD

CVE-2026-80936

EUVD

EUVD-2026-76259

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability affects the Linux kernel's mt76 driver for MediaTek MT7925 Wi-Fi devices. The issue occurs when the device is stopped while a delayed power-save work item (mlo_pm_work) is still pending. The work item tries to execute after the device is torn down, leading to a kernel warning about an invalid workqueue operation.

Detection Guidance

This vulnerability may manifest as a kernel warning or crash when the mt7925 WiFi device is torn down while mlo_pm_work is pending. Check system logs for messages like 'workqueue: cannot queue mt7925_mlo_pm_work' or 'WARNING: kernel/workqueue.c'.

Impact Analysis

This vulnerability may cause kernel warnings or errors when stopping the Wi-Fi device, potentially leading to system instability or crashes. It affects systems using MT7925 Wi-Fi chips via PCIe or USB interfaces.

Mitigation Strategies

Apply the latest Linux kernel update that includes the fix for this issue. If immediate patching is not possible, avoid tearing down the mt7925 WiFi device during active operations to reduce the risk of the workqueue issue.

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