Description

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

bpf: Fix deadlock between rcu_tasks_trace and event_mutex.

Fix the following deadlock:
CPU A
_free_event()
perf_kprobe_destroy()
mutex_lock(&event_mutex)
perf_trace_event_unreg()
synchronize_rcu_tasks_trace()

There are several paths where _free_event() grabs event_mutex
and calls sync_rcu_tasks_trace. Above is one such case.

CPU B
bpf_prog_test_run_syscall()
rcu_read_lock_trace()
bpf_prog_run_pin_on_cpu()
bpf_prog_load()
bpf_tracing_func_proto()
trace_set_clr_event()
mutex_lock(&event_mutex)

Delegate trace_set_clr_event() to workqueue to avoid
such lock dependency.

Classification

CVE ID: CVE-2025-37884

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.02% (probability of being exploited)

EPSS Percentile: 4.73% (scored less or equal to compared to others)

EPSS Date: 2025-06-07 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-37884
https://git.kernel.org/stable/c/255cbc9db7067a83713fd2f4b31034ddd266549a
https://git.kernel.org/stable/c/b5a528a34e1f613565115a7a6016862ccbfcb9ac
https://git.kernel.org/stable/c/c5c833f6375f8ecf9254dd27946c927c7d645421
https://git.kernel.org/stable/c/45286680b385f2592db3003554872388dee66d68
https://git.kernel.org/stable/c/4580f4e0ebdf8dc8d506ae926b88510395a0c1d1

Timeline