Deadlock Vulnerability in Linux Kernel Affecting Device Queue Management

CVE-2025-21807

Summary

A vulnerability in the Linux kernel's device queue management system could lead to deadlock situations. This occurs when the queue is frozen and user attempts to modify limit values, while a device driver is revalidating the queue limits. The issue lies in the order of locking mechanisms, where freezing the queue prior to updating limits can cause conflicts. The solution involves using updated methods to protect against these scenarios by adjusting the locking sequence, thus enhancing the stability and reliability of device management.

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