CVE-2026-93181

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

perf/x86/intel/uncore: Fix uncore_box ref/unref ordering

In uncore_event_cpu_online(), uncore_box_ref() was called before

uncore_change_context(). uncore_box_ref() gates on box->cpu >= 0,

but box->cpu is still -1 at that point because uncore_change_context()

has not run yet. As a result, the box is never initialized on the

first CPU to come online in a die, leaving it permanently

uninitialized in the single-CPU-per-die case.

Thus, box->refcnt is one count below the true value, and in the CPU

offline path, the box will be torn down on the second-to-last CPU.

In uncore_event_cpu_offline(), uncore_box_unref() was called after

uncore_change_context(), so box->cpu is already -1 when the collector

CPU goes offline, which prevents it from tearing down the box.

Fix by swapping the call order in both paths so that

uncore_box_{ref,unref}() runs at the point where box->cpu reflects

the correct context.

Move allocate_boxes() out of uncore_box_ref() to enable this

reordering.