{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-43870",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2024-43870"
  ],
  "published": "2024-08-21T00:07:46Z",
  "summary": "perf: Fix event leak upon exit",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf: Fix event leak upon exit\n\nWhen a task is scheduled out, pending sigtrap deliveries are deferred\nto the target task upon resume to userspace via task_work.\n\nHowever failures while adding an event's callback to the task_work\nengine are ignored. And since the last call for events exit happen\nafter task work is eventually closed, there is a small window during\nwhich pending sigtrap can be queued though ignored, leaking the event\nrefcount addition such as in the following scenario:\n\n    TASK A\n    -----\n\n    do_exit()\n       exit_task_work(tsk);\n\n       <IRQ>\n       perf_event_overflow()\n          event->pending_sigtrap = pending_id;\n          irq_work_queue(&event->pending_irq);\n       </IRQ>\n    =========> PREEMPTION: TASK A -> TASK B\n       event_sched_out()\n          event->pending_sigtrap = 0;\n          atomic_long_inc_not_zero(&event->refcount)\n          // FAILS: task work has exited\n          task_work_add(&event->pending_task)\n       [...]\n       <IRQ WORK>\n       perf_pending_irq()\n          // early return: event->oncpu = -1\n       </IRQ WORK>\n       [...]\n    =========> TASK B -> TASK A\n       perf_event_exit_task(tsk)\n          perf_event_exit_event()\n             free_event()\n                WARN(atomic_long_cmpxchg(&event->refcount, 1, 0) != 1)\n                // leak event due to unexpected refcount == 2\n\nAs a result the event is never released while the task exits.\n\nFix this with appropriate task_work_add()'s error handling.",
  "affected": [
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        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-43870"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/67fad724f1b568b356c1065d50df46e6b30eb2f7"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/70882d7fa74f0731492a0d493e8515a4f7131831"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/05d3fd599594abf79aad4484bccb2b26e1cb0b51"
    },
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      "url": "https://git.kernel.org/stable/c/3d7a63352a93bdb8a1cdf29606bf617d3ac1c22a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2fd5ad3f310de22836cdacae919dd99d758a1f1b"
    }
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-24T06:48:58Z"
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}