{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-21889",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-21889"
  ],
  "published": "2025-03-27T15:01:31Z",
  "summary": "perf/core: Add RCU read lock protection to perf_iterate_ctx()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf/core: Add RCU read lock protection to perf_iterate_ctx()\n\nThe perf_iterate_ctx() function performs RCU list traversal but\ncurrently lacks RCU read lock protection. This causes lockdep warnings\nwhen running perf probe with unshare(1) under CONFIG_PROVE_RCU_LIST=y:\n\n\tWARNING: suspicious RCU usage\n\tkernel/events/core.c:8168 RCU-list traversed in non-reader section!!\n\n\t Call Trace:\n\t  lockdep_rcu_suspicious\n\t  ? perf_event_addr_filters_apply\n\t  perf_iterate_ctx\n\t  perf_event_exec\n\t  begin_new_exec\n\t  ? load_elf_phdrs\n\t  load_elf_binary\n\t  ? lock_acquire\n\t  ? find_held_lock\n\t  ? bprm_execve\n\t  bprm_execve\n\t  do_execveat_common.isra.0\n\t  __x64_sys_execve\n\t  do_syscall_64\n\t  entry_SYSCALL_64_after_hwframe\n\nThis protection was previously present but was removed in commit\nbd2756811766 (\"perf: Rewrite core context handling\"). Add back the\nnecessary rcu_read_lock()/rcu_read_unlock() pair around\nperf_iterate_ctx() call in perf_event_exec().\n\n[ mingo: Use scoped_guard() as suggested by Peter ]",
  "affected": [
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        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
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        "1:6.6.51-1+rpt2",
        "1:6.6.51-1+rpt3",
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-21889"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f390c2eea571945f357a2d3b9fcb1c015767132e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a2475ccad6120546ea45dbcd6cd1f74dc565ef6b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/dd536566dda9a551fc2a2acfab5313a5bb13ed02"
    },
    {
      "type": "FIX",
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    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z"
  }
}