Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: perf: Fix perf_pending_task() UaF Per syzbot it is possible for perf_pending_task() to run after the event is free()'d. There are two related but distinct cases: - the task_work was already queued before destroying the event; - destroying the event itself queues the task_work. The first cannot be solved using task_work_cancel() since perf_release() itself might be called from a task_work (____fput), which means the current->task_works list is already empty and task_work_cancel() won't be able to find the perf_pending_task() entry. The simplest alternative is extending the perf_event lifetime to cover the task_work. The second is just silly, queueing a task_work while you know the event is going away makes no sense and is easily avoided by re-arranging how the event is marked STATE_DEAD and ensuring it goes through STATE_OFF on the way down.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected ca7b0a10287e2733bdafb01ef0d4038536625fe3 before 8bffa95ac19ff27c8261904f89d36c7fcf215d59; affected 078c12ccf1fb943cc18c84894c76113dc89e5975 before 78e1317a174edbfd1182599bf76c092a2877672c; affected ca6c21327c6af02b7eec31ce4b9a740a18c6c13f before 517e6a301f34613bff24a8e35b5455884f2d83d8 |
| Linux / Linux | affected 5.15.77 before 5.15.84; affected 6.0.7 before 6.0.14 |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/8bffa95ac19ff27c8261904f89d36c7fcf215d59
- https://git.kernel.org/stable/c/78e1317a174edbfd1182599bf76c092a2877672c
- https://git.kernel.org/stable/c/517e6a301f34613bff24a8e35b5455884f2d83d8
ADP enrichment
No English description supplied.
No references supplied.