Bug 2492336 (CVE-2026-53101)

Summary: CVE-2026-53101 kernel: wifi: mt76: mt7921: fix potential deadlock in mt7921_roc_abort_sync
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's mt7921 Wi-Fi driver. A potential deadlock can occur when the `roc_abort_sync()` function attempts to cancel a work item while `roc_work()` is still running and holding a mutex. This situation, which can arise during Wi-Fi station removal, causes both sides to block, preventing further progress. The most important consequence is a Denial of Service (DoS), where the system becomes unresponsive.
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Description OSIDB Bzimport 2026-06-24 18:06:30 UTC 
In the Linux kernel, the following vulnerability has been resolved:

wifi: mt76: mt7921: fix potential deadlock in mt7921_roc_abort_sync

roc_abort_sync() can deadlock with roc_work(). roc_work() holds
dev->mt76.mutex, while cancel_work_sync() waits for roc_work()
to finish. If the caller already owns the same mutex, both
sides block and no progress is possible.

This deadlock can occur during station removal when
mt76_sta_state() -> mt76_sta_remove() -> mt7921_mac_sta_remove() ->
mt7921_roc_abort_sync() invokes cancel_work_sync() while
roc_work() is still running and holding dev->mt76.mutex.

This avoids the mutex deadlock and preserves exactly-once
work ownership.
Comment 1 Keith Grant 2026-06-26 18:32:38 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026062411-CVE-2026-53101-1a11@gregkh/T