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

Summary

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 ]

Timeline

1. Mar 27, 2025, 2:57 PM UTCCVE published
2. Oct 15, 2026, 9:43 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: total

3. Oct 15, 2026, 9:51 PM UTCRecord last updated

Affected versions

• Linux Linux

  From bd27568117664b8b3e259721393df420ed51f57b · fixed in f390c2eea571945f357a2d3b9fcb1c015767132e; From bd27568117664b8b3e259721393df420ed51f57b · fixed in a2475ccad6120546ea45dbcd6cd1f74dc565ef6b; From bd27568117664b8b3e259721393df420ed51f57b · fixed in dd536566dda9a551fc2a2acfab5313a5bb13ed02; From bd27568117664b8b3e259721393df420ed51f57b · fixed in 0fe8813baf4b2e865d3b2c735ce1a15b86002c74

• Linux Linux

  6.2

• KernelLinux

  From 6.2.0 · fixed in 6.6.81; From 6.7.0 · fixed in 6.12.18; From 6.13.0 · fixed in 6.13.6

References 4