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CVE-2025-71135

Estado: AnalizadaMedia (5.5)—

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

md/raid5: fix possible null-pointer dereferences in raid5_store_group_thread_cnt()

The variable mddev->private is first assigned to conf and then checked:

If conf is NULL, then mddev->private is also NULL. In this case, null-pointer dereferences can occur when calling raid5_quiesce():

since mddev->private is assigned to conf again in raid5_quiesce(), and conf is dereferenced in several places, for example:

To fix this issue, the function should unlock mddev and return before invoking raid5_quiesce() when conf is NULL, following the existing pattern in raid5_change_consistency_policy().

Detalles técnicos trazas, registros y código del informe original
  conf = mddev->private;
  if (!conf) ...

  raid5_quiesce(mddev, true);
  raid5_quiesce(mddev, false);

  conf->quiesce = 0;
  wake_up(&conf->wait_for_quiescent);

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
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  "id": "CVE-2025-71135",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "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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          "programFiles": [
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          "defaultStatus": "affected"
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  "published": "2026-01-14T15:16:03.277",
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ]
    }
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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd/raid5: fix possible null-pointer dereferences in raid5_store_group_thread_cnt()\n\nThe variable mddev->private is first assigned to conf and then checked:\n\n  conf = mddev->private;\n  if (!conf) ...\n\nIf conf is NULL, then mddev->private is also NULL. In this case,\nnull-pointer dereferences can occur when calling raid5_quiesce():\n\n  raid5_quiesce(mddev, true);\n  raid5_quiesce(mddev, false);\n\nsince mddev->private is assigned to conf again in raid5_quiesce(), and conf\nis dereferenced in several places, for example:\n\n  conf->quiesce = 0;\n  wake_up(&conf->wait_for_quiescent);\n\nTo fix this issue, the function should unlock mddev and return before\ninvoking raid5_quiesce() when conf is NULL, following the existing pattern\nin raid5_change_consistency_policy()."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmd/raid5: corrige posibles desreferencias de puntero nulo en raid5_store_group_thread_cnt()\n\nLa variable mddev->private se asigna primero a conf y luego se comprueba:\n\n  conf = mddev->private;\n  if (!conf) ...\n\nSi conf es NULL, entonces mddev->private también es NULL. En este caso,\npueden ocurrir desreferencias de puntero nulo al llamar a raid5_quiesce():\n\n  raid5_quiesce(mddev, true);\n  raid5_quiesce(mddev, false);\n\nya que mddev->private se asigna a conf de nuevo en raid5_quiesce(), y conf\nse desreferencia en varios lugares, por ejemplo:\n\n  conf->quiesce = 0;\n  wake_up(&conf->wait_for_quiescent);\n\nPara solucionar este problema, la función debería desbloquear mddev y retornar antes de\ninvocar raid5_quiesce() cuando conf es NULL, siguiendo el patrón existente\nen raid5_change_consistency_policy()."
    }
  ],
  "lastModified": "2026-06-17T10:03:44.170",
  "configurations": [
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