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    <item>
      <title>CVE-2025-37884 — bpf: Fix deadlock between rcu_tasks_trace and event_mutex.</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2025-37884</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Linux&lt;/p&gt;
&lt;p&gt;In the Linux kernel, the following vulnerability has been resolved:&lt;/p&gt;
&lt;p&gt;bpf: Fix deadlock between rcu_tasks_trace and event_mutex.&lt;/p&gt;
&lt;p&gt;Fix the following deadlock:
CPU A
_free_event()
  perf_kprobe_destroy()
    mutex_lock(&amp;amp;event_mutex)
      perf_trace_event_unreg()
        synchronize_rcu_tasks_trace()&lt;/p&gt;
&lt;p&gt;There are several paths where _free_event() grabs event_mutex
and calls sync_rcu_tasks_trace. Above is one such case.&lt;/p&gt;
&lt;p&gt;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(&amp;amp;event_mutex)&lt;/p&gt;
&lt;p&gt;Delegate trace_set_clr_event() to workqueue to avoid
such lock dependency.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Linux&lt;/p&gt;
&lt;p&gt;In the Linux kernel, the following vulnerability has been resolved:&lt;/p&gt;
&lt;p&gt;bpf: Fix deadlock between rcu_tasks_trace and event_mutex.&lt;/p&gt;
&lt;p&gt;Fix the following deadlock:
CPU A
_free_event()
  perf_kprobe_destroy()
    mutex_lock(&amp;amp;event_mutex)
      perf_trace_event_unreg()
        synchronize_rcu_tasks_trace()&lt;/p&gt;
&lt;p&gt;There are several paths where _free_event() grabs event_mutex
and calls sync_rcu_tasks_trace. Above is one such case.&lt;/p&gt;
&lt;p&gt;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(&amp;amp;event_mutex)&lt;/p&gt;
&lt;p&gt;Delegate trace_set_clr_event() to workqueue to avoid
such lock dependency.&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://vulnerability.circl.lu/vuln/cve-2025-37884</guid>
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