CVE-2025-21889

MediumCVSS 5.5/10Last modified Oct 15, 2026

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 ]

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected software

VendorProductVersions
LinuxLinux>= bd27568117664b8b3e259721393df420ed51f57b, < f390c2eea571945f357a2d3b9fcb1c015767132e; >= bd27568117664b8b3e259721393df420ed51f57b, < a2475ccad6120546ea45dbcd6cd1f74dc565ef6b; >= bd27568117664b8b3e259721393df420ed51f57b, < dd536566dda9a551fc2a2acfab5313a5bb13ed02; >= bd27568117664b8b3e259721393df420ed51f57b, < 0fe8813baf4b2e865d3b2c735ce1a15b86002c74
LinuxLinux6.2

References

Timeline

Published
Mar 27, 2025
Last modified
Oct 15, 2026
NVD status
Modified

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CVE-2025-21889: Medium severity, CVSS 5.5 | Vulnix