In the Linux kernel, the following vulnerability has been resolved: perf: Ensure swevent hrtimer is properly destroyed With the change to hrtimer_try_to_cancel() in perf_swevent_cancel_hrtimer() it appears possible for the hrtimer to still be active by the time the event gets freed. Make sure the event does a full hrtimer_cancel() on the free path by installing a perf_event::destroy handler.
https://git.kernel.org/stable/c/ff5860f5088e9076ebcccf05a6ca709d5935cfa9
https://git.kernel.org/stable/c/deee9dfb111ab00f9dfd46c0c7e36656b80f5235