Linux Kernel up to 6.18.32/7.0.9 wifi mt76_remain_on_channel mutex deadlock

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.18.32/7.0.9 and classified as critical. This issue affects the function mt76_remain_on_channel of the component wifi. Such manipulation of the argument mutex leads to deadlock. This vulnerability is traded as CVE-2026-53100. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.18.32/7.0.9. It has been rated as critical. Affected by this issue is the function mt76_remain_on_channel of the component wifi. The manipulation of the argument mutex with an unknown input leads to a deadlock vulnerability. Using CWE to declare the problem leads to CWE-833. The product contains multiple threads or executable segments that are waiting for each other to release a necessary lock, resulting in deadlock. Impacted is availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: fix deadlock in remain-on-channel mt76_remain_on_channel() and mt76_roc_complete() call mt76_set_channel() while already holding dev->mutex. Since mt76_set_channel() also acquires dev->mutex, this results in a deadlock. Use __mt76_set_channel() instead of mt76_set_channel(). Add cancel_delayed_work_sync() for mac_work before acquiring the mutex in mt76_remain_on_channel() to prevent a secondary deadlock with the mac_work workqueue.

The advisory is available at git.kernel.org. This vulnerability is handled as CVE-2026-53100 since 06/09/2026. The exploitation is known to be difficult. Technical details are known, but there is no available exploit.

Upgrading to version 6.18.33 or 7.0.10 eliminates this vulnerability. Applying the patch 5fc8c5d45e44575dda9fcabdc2aac4ad97baf0cd/7a89c245d203aa0ed5ff2d68ac05b48b2ef9fa3f/6939b97ddad3cf3dfbb3b5a0a12ef79cb886747e is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 6.18.0
• 6.18.1
• 6.18.2
• 6.18.3
• 6.18.4
• 6.18.5
• 6.18.6
• 6.18.7
• 6.18.8
• 6.18.9
• 6.18.10
• 6.18.11
• 6.18.12
• 6.18.13
• 6.18.14
• 6.18.15
• 6.18.16
• 6.18.17
• 6.18.18
• 6.18.19
• 6.18.20
• 6.18.21
• 6.18.22
• 6.18.23
• 6.18.24
• 6.18.25
• 6.18.26
• 6.18.27
• 6.18.28
• 6.18.29
• 6.18.30
• 6.18.31
• 6.18.32
• 7.0.0
• 7.0.1
• 7.0.2
• 7.0.3
• 7.0.4
• 7.0.5
• 7.0.6
• 7.0.7
• 7.0.8
• 7.0.9

License

• open-source

Website

• Vendor: https://www.kernel.org/

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