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

perf: Fix race between perf event exit task() and perf pending task()

A race condition exists between perf event exit task() and perf pending task() during begin new exec().

During begin new exec(), perf event exit task() may be called, and the PF EXITING flag is not set on task. So perf sigtrap() continues to execute and triggers WARN ON ONCE(event->ctx->task != current).

Since both task exit and exec paths can call perf event exit task() which sets ctx->task to TASK TOMBSTONE, fix this by explicitly checking if event->ctx->task equals TASK TOMBSTONE and dropping the redundant PF EXITING check.