FKIE_CVE-2024-43870

Vulnerability from fkie_nvd - Published: 2024-08-21 01:15 - Updated: 2025-11-03 22:18
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: perf: Fix event leak upon exit When a task is scheduled out, pending sigtrap deliveries are deferred to the target task upon resume to userspace via task_work. However failures while adding an event's callback to the task_work engine are ignored. And since the last call for events exit happen after task work is eventually closed, there is a small window during which pending sigtrap can be queued though ignored, leaking the event refcount addition such as in the following scenario: TASK A ----- do_exit() exit_task_work(tsk); <IRQ> perf_event_overflow() event->pending_sigtrap = pending_id; irq_work_queue(&event->pending_irq); </IRQ> =========> PREEMPTION: TASK A -> TASK B event_sched_out() event->pending_sigtrap = 0; atomic_long_inc_not_zero(&event->refcount) // FAILS: task work has exited task_work_add(&event->pending_task) [...] <IRQ WORK> perf_pending_irq() // early return: event->oncpu = -1 </IRQ WORK> [...] =========> TASK B -> TASK A perf_event_exit_task(tsk) perf_event_exit_event() free_event() WARN(atomic_long_cmpxchg(&event->refcount, 1, 0) != 1) // leak event due to unexpected refcount == 2 As a result the event is never released while the task exits. Fix this with appropriate task_work_add()'s error handling.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/05d3fd599594abf79aad4484bccb2b26e1cb0b51Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2fd5ad3f310de22836cdacae919dd99d758a1f1bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3d7a63352a93bdb8a1cdf29606bf617d3ac1c22aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/67fad724f1b568b356c1065d50df46e6b30eb2f7Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/70882d7fa74f0731492a0d493e8515a4f7131831Patch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.1
linux linux_kernel 6.1
To clipboard 

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  "descriptions": [
    {
      "lang": "en",
      "value": "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\u0027s 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       \u003cIRQ\u003e\n       perf_event_overflow()\n          event-\u003epending_sigtrap = pending_id;\n          irq_work_queue(\u0026event-\u003epending_irq);\n       \u003c/IRQ\u003e\n    =========\u003e PREEMPTION: TASK A -\u003e TASK B\n       event_sched_out()\n          event-\u003epending_sigtrap = 0;\n          atomic_long_inc_not_zero(\u0026event-\u003erefcount)\n          // FAILS: task work has exited\n          task_work_add(\u0026event-\u003epending_task)\n       [...]\n       \u003cIRQ WORK\u003e\n       perf_pending_irq()\n          // early return: event-\u003eoncpu = -1\n       \u003c/IRQ WORK\u003e\n       [...]\n    =========\u003e TASK B -\u003e TASK A\n       perf_event_exit_task(tsk)\n          perf_event_exit_event()\n             free_event()\n                WARN(atomic_long_cmpxchg(\u0026event-\u003erefcount, 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()\u0027s error handling."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: perf: corrige la fuga de eventos al salir Cuando se programa una tarea, las entregas de sigtrap pendientes se difieren a la tarea de destino al reanudarse en el espacio de usuario a trav\u00e9s de task_work. Sin embargo, se ignoran los fallos al agregar la devoluci\u00f3n de llamada de un evento al motor task_work. Y dado que la \u00faltima llamada para la salida de eventos ocurre despu\u00e9s de que finalmente se cierra el trabajo de la tarea, hay una peque\u00f1a ventana durante la cual el sigtrap pendiente se puede poner en cola aunque se ignore, lo que filtra la adici\u00f3n del recuento de eventos, como en el siguiente escenario: TAREA A ----- do_exit() salida_task_work(tsk);  perf_event_overflow() evento-\u0026gt;pending_sigtrap = pendiente_id; irq_work_queue(\u0026amp;event-\u0026gt;pending_irq);  =========\u0026gt; PREEMPCI\u00d3N: TAREA A -\u0026gt; TAREA B event_sched_out() evento-\u0026gt;pending_sigtrap = 0; atomic_long_inc_not_zero(\u0026amp;event-\u0026gt;refcount) // FALLA: el trabajo de la tarea ha salido task_work_add(\u0026amp;event-\u0026gt;pending_task) [...]  perf_pending_irq() // retorno temprano: evento-\u0026gt;oncpu = -1  [...] =========\u0026gt; TAREA B -\u0026gt; TAREA A perf_event_exit_task(tsk) perf_event_exit_event() free_event() WARN(atomic_long_cmpxchg(\u0026amp;event-\u0026gt;refcount, 1, 0) != 1) / /evento de fuga debido a un recuento inesperado == 2 Como resultado, el evento nunca se libera mientras la tarea finaliza. Solucione este problema con el manejo de errores apropiado de task_work_add()."
    }
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  "id": "CVE-2024-43870",
  "lastModified": "2025-11-03T22:18:14.727",
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          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
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        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
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  "published": "2024-08-21T01:15:11.620",
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  "vulnStatus": "Modified",
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