CVE-2025-21889 (GCVE-0-2025-21889)
Vulnerability from cvelistv5
Published
2025-03-27 14:57
Modified
2025-05-04 07:23
Severity ?
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 ]
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0fe8813baf4b2e865d3b2c735ce1a15b86002c74
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a2475ccad6120546ea45dbcd6cd1f74dc565ef6b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dd536566dda9a551fc2a2acfab5313a5bb13ed02
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f390c2eea571945f357a2d3b9fcb1c015767132e
Impacted products
Vendor Product Version
Linux Linux Version: bd27568117664b8b3e259721393df420ed51f57b
Version: bd27568117664b8b3e259721393df420ed51f57b
Version: bd27568117664b8b3e259721393df420ed51f57b
Version: bd27568117664b8b3e259721393df420ed51f57b
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   Linux Linux Version: 6.2
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
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              "versionType": "semver"
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              "version": "6.12.18",
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "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 ]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T07:23:24.688Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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        },
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        {
          "url": "https://git.kernel.org/stable/c/dd536566dda9a551fc2a2acfab5313a5bb13ed02"
        },
        {
          "url": "https://git.kernel.org/stable/c/0fe8813baf4b2e865d3b2c735ce1a15b86002c74"
        }
      ],
      "title": "perf/core: Add RCU read lock protection to perf_iterate_ctx()",
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-21889",
    "datePublished": "2025-03-27T14:57:15.897Z",
    "dateReserved": "2024-12-29T08:45:45.782Z",
    "dateUpdated": "2025-05-04T07:23:24.688Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-21889\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-03-27T15:15:56.820\",\"lastModified\":\"2025-03-27T16:45:12.210\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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 ]\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0fe8813baf4b2e865d3b2c735ce1a15b86002c74\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a2475ccad6120546ea45dbcd6cd1f74dc565ef6b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dd536566dda9a551fc2a2acfab5313a5bb13ed02\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f390c2eea571945f357a2d3b9fcb1c015767132e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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