CVE-2025-71135 (GCVE-0-2025-71135)

Vulnerability from cvelistv5 – Published: 2026-01-14 15:07 – Updated: 2026-05-23 16:03
VLAI
Title
md/raid5: fix possible null-pointer dereferences in raid5_store_group_thread_cnt()
Summary
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: conf = mddev->private; if (!conf) ... If conf is NULL, then mddev->private is also NULL. In this case, null-pointer dereferences can occur when calling raid5_quiesce(): raid5_quiesce(mddev, true); raid5_quiesce(mddev, false); since mddev->private is assigned to conf again in raid5_quiesce(), and conf is dereferenced in several places, for example: conf->quiesce = 0; wake_up(&conf->wait_for_quiescent); 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().
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6820 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: be19e6e4339d1579d5f2fae8ce4facf9521dbbfc , < 20597b7229aea8b5bc45cd92097640257c7fc33b (git)
Affected: fa1944bbe6220eb929e2c02e5e8706b908565711 , < e5abb6af905de6b2fead8a0b3f32ab0b81468a01 (git)
Affected: fa1944bbe6220eb929e2c02e5e8706b908565711 , < 7ad6ef91d8745d04aff9cce7bdbc6320d8e05fe9 (git)
Affected: 6.12.4 , < 6.12.64 (semver)
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Linux Linux Affected: 6.13
Unaffected: 0 , < 6.13 (semver)
Unaffected: 6.12.64 , ≤ 6.12.* (semver)
Unaffected: 6.18.4 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
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            "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-\u003eprivate is first assigned to conf and then checked:\n\n  conf = mddev-\u003eprivate;\n  if (!conf) ...\n\nIf conf is NULL, then mddev-\u003eprivate 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-\u003eprivate is assigned to conf again in raid5_quiesce(), and conf\nis dereferenced in several places, for example:\n\n  conf-\u003equiesce = 0;\n  wake_up(\u0026conf-\u003ewait_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()."
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          {
            "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-\u0026gt;private se asigna primero a conf y luego se comprueba:\n\n  conf = mddev-\u0026gt;private;\n  if (!conf) ...\n\nSi conf es NULL, entonces mddev-\u0026gt;private tambi\u00e9n 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-\u0026gt;private se asigna a conf de nuevo en raid5_quiesce(), y conf\nse desreferencia en varios lugares, por ejemplo:\n\n  conf-\u0026gt;quiesce = 0;\n  wake_up(\u0026amp;conf-\u0026gt;wait_for_quiescent);\n\nPara solucionar este problema, la funci\u00f3n deber\u00eda desbloquear mddev y retornar antes de\ninvocar raid5_quiesce() cuando conf es NULL, siguiendo el patr\u00f3n existente\nen raid5_change_consistency_policy()."
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        "id": "CVE-2025-71135",
        "lastModified": "2026-06-17T10:03:44.170",
        "metrics": {
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                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
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        "vulnStatus": "Analyzed",
        "weaknesses": [
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                "value": "CWE-476"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T07:12:45+00:00",
      "cve": "CVE-2025-71135",
      "id": "CVE-2025-71135",
      "initial_release_date": "2025-01-01T00:00:00+00:00",
      "product_status:known_affected": "246",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: md/raid5: fix possible null-pointer dereferences in raid5_store_group_thread_cnt()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-71135.json",
      "version": "3"
    }
  }
}



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