CVE-2025-21889

perf/core: Add RCU read lock protection to perf_iterate_ctx()

Description

In the Linux kernel, the following vulnerability has been resolved: perf/core: Add RCU read lock protection to perf_iterate_ctx() The perf_iterate_ctx() function performs RCU list traversal but currently lacks RCU read lock protection. This causes lockdep warnings when running perf probe with unshare(1) under CONFIG_PROVE_RCU_LIST=y: WARNING: suspicious RCU usage kernel/events/core.c:8168 RCU-list traversed in non-reader section!! Call Trace: lockdep_rcu_suspicious ? perf_event_addr_filters_apply perf_iterate_ctx perf_event_exec begin_new_exec ? load_elf_phdrs load_elf_binary ? lock_acquire ? find_held_lock ? bprm_execve bprm_execve do_execveat_common.isra.0 __x64_sys_execve do_syscall_64 entry_SYSCALL_64_after_hwframe This protection was previously present but was removed in commit bd2756811766 ("perf: Rewrite core context handling"). Add back the necessary rcu_read_lock()/rcu_read_unlock() pair around perf_iterate_ctx() call in perf_event_exec(). [ mingo: Use scoped_guard() as suggested by Peter ]

N/A

CVSS

Severity:

EPSS 0.03%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/f390c2eea571945f357a2d3b9fcb1c015767132e
https://git.kernel.org/stable/c/a2475ccad6120546ea45dbcd6cd1f74dc565ef6b
https://git.kernel.org/stable/c/dd536566dda9a551fc2a2acfab5313a5bb13ed02
https://git.kernel.org/stable/c/0fe8813baf4b2e865d3b2c735ce1a15b86002c74

Frequently Asked Questions

What is the severity of CVE-2025-21889?: CVE-2025-21889 has not yet been assigned a CVSS score.
How to fix CVE-2025-21889?: To fix CVE-2025-21889, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-21889 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2025-21889 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-21889?: CVE-2025-21889 affects Linux Linux, Linux Linux.

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