The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - perf: Fix hang while freeing sigtrap event Perf can hang while freeing a sigtrap event if a related     deferred signal hadn't managed to be sent before the file got closed: perf_event_overflow()     task_work_add(perf_pending_task) fput() task_work_add(____fput()) task_work_run() ____fput()     perf_release() perf_event_release_kernel() _free_event() perf_pending_task_sync() task_work_cancel() ->     FAILED rcuwait_wait_event() Once task_work_run() is running, the list of pending callbacks is removed from     the task_struct and from this point on task_work_cancel() can't remove any pending and not yet started     work items, hence the task_work_cancel() failure and the hang on rcuwait_wait_event(). Task work could be     changed to remove one work at a time, so a work running on the current task can always cancel a pending     one, however the wait / wake design is still subject to inverted dependencies when remote targets are     involved, as pictured by Oleg: T1 T2 fd = perf_event_open(pid => T2->pid); fd = perf_event_open(pid =>     T1->pid); close(fd) close(fd) <IRQ> <IRQ> perf_event_overflow() perf_event_overflow()     task_work_add(perf_pending_task) task_work_add(perf_pending_task) </IRQ> </IRQ> fput() fput()     task_work_add(____fput()) task_work_add(____fput()) task_work_run() task_work_run() ____fput() ____fput()     perf_release() perf_release() perf_event_release_kernel() perf_event_release_kernel() _free_event()
    _free_event() perf_pending_task_sync() perf_pending_task_sync() rcuwait_wait_event() rcuwait_wait_event()     Therefore the only option left is to acquire the event reference count upon queueing the perf task work     and release it from the task work, just like it was done before 3a5465418f5f (perf: Fix event leak upon     exec and file release) but without the leaks it fixed. Some adjustments are necessary to make it work: *     A child event might dereference its parent upon freeing. Care must be taken to release the parent last. *     Some places assuming the event doesn't have any reference held and therefore can be freed right away must     instead put the reference and let the reference counting to its job. (CVE-2025-37747)

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Linux Distros Unpatched Vulnerability : CVE-2025-37747

medium Nessus Plugin ID 244282

Version 1.1