CVE-2026-31480 — tracing: Fix potential deadlock in cpu hotplug with osnoise

Affected: Linux

In the Linux kernel, the following vulnerability has been resolved:

tracing: Fix potential deadlock in cpu hotplug with osnoise

The following sequence may leads deadlock in cpu hotplug:

task1 task2 task3 ----- ----- -----

mutex_lock(&interface_lock)

[CPU GOING OFFLINE]

cpus_write_lock(); osnoise_cpu_die(); kthread_stop(task3); wait_for_completion();

osnoise_sleep(); mutex_lock(&interface_lock);

cpus_read_lock();

[DEAD LOCK]

Fix by swap the order of cpus_read_lock() and mutex_lock(&interface_lock).

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