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CVE-2025-38072

Estado: AnalizadaMedia (5.5)—

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

libnvdimm/labels: Fix divide error in nd_label_data_init()

If a faulty CXL memory device returns a broken zero LSA size in its memory device information (Identify Memory Device (Opcode 4000h), CXL spec. 3.1, 8.2.9.9.1.1), a divide error occurs in the libnvdimm driver:

Code and flow:

1) CXL Command 4000h returns LSA size = 0 2) config_size is assigned to zero LSA size (CXL pmem driver):

drivers/cxl/pmem.c: .config_size = mds->lsa_size,

3) max_xfer is set to zero (nvdimm driver):

4) A subsequent DIV_ROUND_UP() causes a division by zero:

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drivers/nvdimm/label.c: /* Make our initial read size a multiple of max_xfer size */ drivers/nvdimm/label.c: read_size = min(DIV_ROUND_UP(read_size, max_xfer) * max_xfer, drivers/nvdimm/label.c- config_size);

Fix this by checking the config size parameter by extending an existing check.

Detalles técnicos trazas, registros y código del informe original
 Oops: divide error: 0000 [#1] PREEMPT SMP NOPTI
 RIP: 0010:nd_label_data_init+0x10e/0x800 [libnvdimm]

drivers/nvdimm/label.c: max_xfer = min_t(size_t, ndd->nsarea.max_xfer, config_size);

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 (2)

Debian — Debian LinuxLinux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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          "integrityImpact": "NONE",
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibnvdimm/labels: Fix divide error in nd_label_data_init()\n\nIf a faulty CXL memory device returns a broken zero LSA size in its\nmemory device information (Identify Memory Device (Opcode 4000h), CXL\nspec. 3.1, 8.2.9.9.1.1), a divide error occurs in the libnvdimm\ndriver:\n\n Oops: divide error: 0000 [#1] PREEMPT SMP NOPTI\n RIP: 0010:nd_label_data_init+0x10e/0x800 [libnvdimm]\n\nCode and flow:\n\n1) CXL Command 4000h returns LSA size = 0\n2) config_size is assigned to zero LSA size (CXL pmem driver):\n\ndrivers/cxl/pmem.c:             .config_size = mds->lsa_size,\n\n3) max_xfer is set to zero (nvdimm driver):\n\ndrivers/nvdimm/label.c: max_xfer = min_t(size_t, ndd->nsarea.max_xfer, config_size);\n\n4) A subsequent DIV_ROUND_UP() causes a division by zero:\n\ndrivers/nvdimm/label.c: /* Make our initial read size a multiple of max_xfer size */\ndrivers/nvdimm/label.c: read_size = min(DIV_ROUND_UP(read_size, max_xfer) * max_xfer,\ndrivers/nvdimm/label.c-                 config_size);\n\nFix this by checking the config size parameter by extending an\nexisting check."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: libnvdimm/labels: Corregir error de división en nd_label_data_init() Si un dispositivo de memoria CXL defectuoso devuelve un tamaño LSA cero roto en su información de dispositivo de memoria (Identificar dispositivo de memoria (Opcode 4000h), especificación CXL 3.1, 8.2.9.9.1.1), se produce un error de división en el controlador libnvdimm: Oops: error de división: 0000 [#1] PREEMPT SMP NOPTI RIP: 0010:nd_label_data_init+0x10e/0x800 [libnvdimm] Código y flujo: 1) El comando CXL 4000h devuelve tamaño LSA = 0 2) config_size se asigna a tamaño LSA cero (controlador pmem CXL): drivers/cxl/pmem.c: .config_size = mds->lsa_size, 3) max_xfer se establece en cero (controlador nvdimm): drivers/nvdimm/label.c: max_xfer = min_t(size_t, ndd->nsarea.max_xfer, config_size); 4) Un DIV_ROUND_UP() posterior provoca una división por cero: drivers/nvdimm/label.c: /* Hacer que nuestro tamaño de lectura inicial sea un múltiplo del tamaño max_xfer */ drivers/nvdimm/label.c: read_size = min(DIV_ROUND_UP(read_size, max_xfer) * max_xfer, drivers/nvdimm/label.c- config_size); Solucione esto comprobando el parámetro de tamaño de configuración extendiendo una comprobación existente."
    }
  ],
  "lastModified": "2026-06-17T09:15:59.947",
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