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CVE-2024-53113

Estado: ModificadaMedia (5.5)—

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

mm: fix NULL pointer dereference in alloc_pages_bulk_noprof

We triggered a NULL pointer dereference for ac.preferred_zoneref->zone in alloc_pages_bulk_noprof() when the task is migrated between cpusets.

When cpuset is enabled, in prepare_alloc_pages(), ac->nodemask may be &current->mems_allowed. when first_zones_zonelist() is called to find preferred_zoneref, the ac->nodemask may be modified concurrently if the task is migrated between different cpusets. Assuming we have 2 NUMA Node, when traversing Node1 in ac->zonelist, the nodemask is 2, and when traversing Node2 in ac->zonelist, the nodemask is 1. As a result, the ac->preferred_zoneref points to NULL zone.

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In alloc_pages_bulk_noprof(), for_each_zone_zonelist_nodemask() finds a allowable zone and calls zonelist_node_idx(ac.preferred_zoneref), leading to NULL pointer dereference.

__alloc_pages_noprof() fixes this issue by checking NULL pointer in commit ea57485af8f4 ("mm, page_alloc: fix check for NULL preferred_zone") and commit df76cee6bbeb ("mm, page_alloc: remove redundant checks from alloc fastpath").

To fix it, check NULL pointer for preferred_zoneref->zone.

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)

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{
  "id": "CVE-2024-53113",
  "cveTags": [],
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        "source": "nvd@nist.gov",
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          "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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          "value": "CWE-476"
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    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: fix NULL pointer dereference in alloc_pages_bulk_noprof\n\nWe triggered a NULL pointer dereference for ac.preferred_zoneref->zone in\nalloc_pages_bulk_noprof() when the task is migrated between cpusets.\n\nWhen cpuset is enabled, in prepare_alloc_pages(), ac->nodemask may be\n&current->mems_allowed.  when first_zones_zonelist() is called to find\npreferred_zoneref, the ac->nodemask may be modified concurrently if the\ntask is migrated between different cpusets.  Assuming we have 2 NUMA Node,\nwhen traversing Node1 in ac->zonelist, the nodemask is 2, and when\ntraversing Node2 in ac->zonelist, the nodemask is 1.  As a result, the\nac->preferred_zoneref points to NULL zone.\n\nIn alloc_pages_bulk_noprof(), for_each_zone_zonelist_nodemask() finds a\nallowable zone and calls zonelist_node_idx(ac.preferred_zoneref), leading\nto NULL pointer dereference.\n\n__alloc_pages_noprof() fixes this issue by checking NULL pointer in commit\nea57485af8f4 (\"mm, page_alloc: fix check for NULL preferred_zone\") and\ncommit df76cee6bbeb (\"mm, page_alloc: remove redundant checks from alloc\nfastpath\").\n\nTo fix it, check NULL pointer for preferred_zoneref->zone."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm: corregir la desreferencia de puntero NULL en alloc_pages_bulk_noprof Activamos una desreferencia de puntero NULL para ac.preferred_zoneref->zone en alloc_pages_bulk_noprof() cuando la tarea se migra entre conjuntos de CPU. Cuando se habilita el conjunto de CPU, en prepare_alloc_pages(), ac->nodemask puede ser &current->mems_allowed. Cuando se llama a first_zones_zonelist() para encontrar preference_zoneref, ac->nodemask puede modificarse simultáneamente si la tarea se migra entre diferentes conjuntos de CPU. Suponiendo que tenemos 2 nodos NUMA, al recorrer el nodo 1 en ac->zonelist, la máscara de nodo es 2, y al recorrer el nodo 2 en ac->zonelist, la máscara de nodo es 1. Como resultado, ac->preferred_zoneref apunta a la zona NULL. En alloc_pages_bulk_noprof(), for_each_zone_zonelist_nodemask() encuentra una zona permitida y llama a zonelist_node_idx(ac.preferred_zoneref), lo que genera una desreferencia del puntero NULL. __alloc_pages_noprof() corrige este problema al verificar el puntero NULL en el commit ea57485af8f4 (\"mm, page_alloc: corregir la verificación para la zona preferida NULL\") y el commit df76cee6bbeb (\"mm, page_alloc: eliminar las verificaciones redundantes de la ruta rápida de asignación\"). Para solucionarlo, verifique el puntero NULL para la zona preferida->zone."
    }
  ],
  "lastModified": "2026-06-17T08:08:20.057",
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