linux-cve-announce - CVE-2025-37884: bpf: Fix deadlock between rcu_tasks_trace and event

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Message-ID: <2025050945-CVE-2025-37884-778b@gregkh>
Date: Fri,  9 May 2025 08:45:51 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-37884: bpf: Fix deadlock between rcu_tasks_trace and event_mutex.

From: Greg Kroah-Hartman <gregkh@...nel.org>

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.

The Linux kernel CVE team has assigned CVE-2025-37884 to this issue.


Affected and fixed versions
===========================

	Fixed in 6.1.136 with commit 255cbc9db7067a83713fd2f4b31034ddd266549a
	Fixed in 6.6.89 with commit b5a528a34e1f613565115a7a6016862ccbfcb9ac
	Fixed in 6.12.26 with commit c5c833f6375f8ecf9254dd27946c927c7d645421
	Fixed in 6.14.5 with commit 45286680b385f2592db3003554872388dee66d68
	Fixed in 6.15-rc1 with commit 4580f4e0ebdf8dc8d506ae926b88510395a0c1d1

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2025-37884
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	kernel/trace/bpf_trace.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	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