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CVE-2024-56613

Estado: ModificadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

sched/numa: fix memory leak due to the overwritten vma->numab_state

[Problem Description] When running the hackbench program of LTP, the following memory leak is reported by kmemleak.

[Root Cause] Since multiple threads are created by the hackbench program (along with the command argument 'thread'), a shared vma might be accessed by two or more cores simultaneously. When two or more cores observe that vma->numab_state is NULL at the same time, vma->numab_state will be overwritten.

Although current code ensures that only one thread scans the VMAs in a single 'numa_scan_period', there might be a chance for another thread to enter in the next 'numa_scan_period' while we have not gotten till numab_state allocation [1].

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Note that the command `/opt/ltp/testcases/bin/hackbench 50 process 1000` cannot the reproduce the issue. It is verified with 200+ test runs.

[Solution] Use the cmpxchg atomic operation to ensure that only one thread executes the vma->numab_state assignment.

[1] https://lore.kernel.org/lkml/1794be3c-358c-4cdc-a43d-a1f841d91ef7@amd.com/

Detalles técnicos trazas, registros y código del informe original
  # /opt/ltp/testcases/bin/hackbench 20 thread 1000
  Running with 20*40 (== 800) tasks.

  # dmesg | grep kmemleak
  ...
  kmemleak: 480 new suspected memory leaks (see /sys/kernel/debug/kmemleak)
  kmemleak: 665 new suspected memory leaks (see /sys/kernel/debug/kmemleak)

  # cat /sys/kernel/debug/kmemleak
  unreferenced object 0xffff888cd8ca2c40 (size 64):
    comm "hackbench", pid 17142, jiffies 4299780315
    hex dump (first 32 bytes):
      ac 74 49 00 01 00 00 00 4c 84 49 00 01 00 00 00  .tI.....L.I.....
      00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    backtrace (crc bff18fd4):
      [<ffffffff81419a89>] __kmalloc_cache_noprof+0x2f9/0x3f0
      [<ffffffff8113f715>] task_numa_work+0x725/0xa00
      [<ffffffff8110f878>] task_work_run+0x58/0x90
      [<ffffffff81ddd9f8>] syscall_exit_to_user_mode+0x1c8/0x1e0
      [<ffffffff81dd78d5>] do_syscall_64+0x85/0x150
      [<ffffffff81e0012b>] entry_SYSCALL_64_after_hwframe+0x76/0x7e
  ...

This issue can be consistently reproduced on three different servers:
  * a 448-core server
  * a 256-core server
  * a 192-core server

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2024-56613",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2024-56613",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-10-01T20:01:15.881890Z"
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      }
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    "cvssMetricV31": [
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          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
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        "impactScore": 3.6,
        "exploitabilityScore": 1.8
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  "published": "2024-12-27T15:15:20.793",
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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/numa: fix memory leak due to the overwritten vma->numab_state\n\n[Problem Description]\nWhen running the hackbench program of LTP, the following memory leak is\nreported by kmemleak.\n\n  # /opt/ltp/testcases/bin/hackbench 20 thread 1000\n  Running with 20*40 (== 800) tasks.\n\n  # dmesg | grep kmemleak\n  ...\n  kmemleak: 480 new suspected memory leaks (see /sys/kernel/debug/kmemleak)\n  kmemleak: 665 new suspected memory leaks (see /sys/kernel/debug/kmemleak)\n\n  # cat /sys/kernel/debug/kmemleak\n  unreferenced object 0xffff888cd8ca2c40 (size 64):\n    comm \"hackbench\", pid 17142, jiffies 4299780315\n    hex dump (first 32 bytes):\n      ac 74 49 00 01 00 00 00 4c 84 49 00 01 00 00 00  .tI.....L.I.....\n      00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n    backtrace (crc bff18fd4):\n      [<ffffffff81419a89>] __kmalloc_cache_noprof+0x2f9/0x3f0\n      [<ffffffff8113f715>] task_numa_work+0x725/0xa00\n      [<ffffffff8110f878>] task_work_run+0x58/0x90\n      [<ffffffff81ddd9f8>] syscall_exit_to_user_mode+0x1c8/0x1e0\n      [<ffffffff81dd78d5>] do_syscall_64+0x85/0x150\n      [<ffffffff81e0012b>] entry_SYSCALL_64_after_hwframe+0x76/0x7e\n  ...\n\nThis issue can be consistently reproduced on three different servers:\n  * a 448-core server\n  * a 256-core server\n  * a 192-core server\n\n[Root Cause]\nSince multiple threads are created by the hackbench program (along with\nthe command argument 'thread'), a shared vma might be accessed by two or\nmore cores simultaneously. When two or more cores observe that\nvma->numab_state is NULL at the same time, vma->numab_state will be\noverwritten.\n\nAlthough current code ensures that only one thread scans the VMAs in a\nsingle 'numa_scan_period', there might be a chance for another thread\nto enter in the next 'numa_scan_period' while we have not gotten till\nnumab_state allocation [1].\n\nNote that the command `/opt/ltp/testcases/bin/hackbench 50 process 1000`\ncannot the reproduce the issue. It is verified with 200+ test runs.\n\n[Solution]\nUse the cmpxchg atomic operation to ensure that only one thread executes\nthe vma->numab_state assignment.\n\n[1] https://lore.kernel.org/lkml/1794be3c-358c-4cdc-a43d-a1f841d91ef7@amd.com/"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: sched/numa: se corrige la pérdida de memoria debido a la sobrescritura de vma-&gt;numab_state [Descripción del problema] Al ejecutar el programa hackbench de LTP, kmemleak informa la siguiente pérdida de memoria. # /opt/ltp/testcases/bin/hackbench 20 thread 1000 Se ejecuta con 20*40 (== 800) tareas. # dmesg | grep kmemleak ... kmemleak: 480 nuevas fugas de memoria sospechosas (consulte /sys/kernel/debug/kmemleak) kmemleak: 665 nuevas fugas de memoria sospechosas (consulte /sys/kernel/debug/kmemleak) # cat /sys/kernel/debug/kmemleak objeto sin referencia 0xffff888cd8ca2c40 (tamaño 64): comm \"hackbench\", pid 17142, jiffies 4299780315 volcado hexadecimal (primeros 32 bytes): ac 74 49 00 01 00 00 00 4c 84 49 00 01 00 00 00 .tI.....LI.... 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ seguimiento inverso (crc bff18fd4): [] __kmalloc_cache_noprof+0x2f9/0x3f0 [] tarea_numa_work+0x725/0xa00 [] tarea_work_run+0x58/0x90 [] llamada_al_sistema_salir_al_modo_usuario+0x1c8/0x1e0 [] hacer_llamada_al_sistema_64+0x85/0x150 [] entry_SYSCALL_64_after_hwframe+0x76/0x7e ... Este problema se puede reproducir consistentemente en tres servidores diferentes: * un servidor de 448 núcleos * un servidor de 256 núcleos * un servidor de 192 núcleos [Causa raíz] Dado que el programa hackbench crea múltiples subprocesos (junto con el argumento de comando 'thread'), dos o más núcleos pueden acceder simultáneamente a un VMA compartido. Cuando dos o más núcleos observan que vma-&gt;numab_state es NULL al mismo tiempo, se sobrescribirá vma-&gt;numab_state. Aunque el código actual garantiza que solo un subproceso escanee los VMA en un solo 'numa_scan_period', puede haber una posibilidad de que otro subproceso ingrese en el siguiente 'numa_scan_period' mientras no hayamos obtenido hasta la asignación de numab_state [1]. Tenga en cuenta que el comando `/opt/ltp/testcases/bin/hackbench 50 process 1000` no puede reproducir el problema. Esto se ha verificado con más de 200 ejecuciones de pruebas. [Solución] Utilice la operación atómica cmpxchg para asegurarse de que solo un subproceso ejecute la asignación vma-&gt;numab_state. [1] https://lore.kernel.org/lkml/1794be3c-358c-4cdc-a43d-a1f841d91ef7@amd.com/"
    }
  ],
  "lastModified": "2026-06-17T08:12:33.003",
  "configurations": [
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      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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}