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CVE-2025-21804

Estado: ModificadaMedia (5.5)—

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

PCI: rcar-ep: Fix incorrect variable used when calling devm_request_mem_region()

The rcar_pcie_parse_outbound_ranges() uses the devm_request_mem_region() macro to request a needed resource. A string variable that lives on the stack is then used to store a dynamically computed resource name, which is then passed on as one of the macro arguments. This can lead to undefined behavior.

Depending on the current contents of the memory, the manifestations of errors may vary. One possible output may be as follows:

Sometimes, garbage may appear after the colon.

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In very rare cases, if no NULL-terminator is found in memory, the system might crash because the string iterator will overrun which can lead to access of unmapped memory above the stack.

Thus, fix this by replacing outbound_name with the name of the previously requested resource. With the changes applied, the output will be as follows:

[kwilczynski: commit log]

Detalles técnicos trazas, registros y código del informe original
  $ cat /proc/iomem
  30000000-37ffffff :
  38000000-3fffffff :

  $ cat /proc/iomem
  30000000-37ffffff : memory2
  38000000-3fffffff : memory3

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-2025-21804",
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    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nPCI: rcar-ep: Fix incorrect variable used when calling devm_request_mem_region()\n\nThe rcar_pcie_parse_outbound_ranges() uses the devm_request_mem_region()\nmacro to request a needed resource. A string variable that lives on the\nstack is then used to store a dynamically computed resource name, which\nis then passed on as one of the macro arguments. This can lead to\nundefined behavior.\n\nDepending on the current contents of the memory, the manifestations of\nerrors may vary. One possible output may be as follows:\n\n  $ cat /proc/iomem\n  30000000-37ffffff :\n  38000000-3fffffff :\n\nSometimes, garbage may appear after the colon.\n\nIn very rare cases, if no NULL-terminator is found in memory, the system\nmight crash because the string iterator will overrun which can lead to\naccess of unmapped memory above the stack.\n\nThus, fix this by replacing outbound_name with the name of the previously\nrequested resource. With the changes applied, the output will be as\nfollows:\n\n  $ cat /proc/iomem\n  30000000-37ffffff : memory2\n  38000000-3fffffff : memory3\n\n[kwilczynski: commit log]"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: PCI: rcar-ep: Se corrige la variable incorrecta utilizada al llamar a devm_request_mem_region(). rcar_pcie_parse_outbound_ranges() utiliza la macro devm_request_mem_region() para solicitar un recurso necesario. Luego, se utiliza una variable de cadena que se encuentra en la pila para almacenar un nombre de recurso calculado dinámicamente, que luego se pasa como uno de los argumentos de la macro. Esto puede provocar un comportamiento indefinido. Según el contenido actual de la memoria, las manifestaciones de los errores pueden variar. Una posible salida puede ser la siguiente: $ cat /proc/iomem 30000000-37ffffff : 38000000-3fffffff : A veces, puede aparecer basura después de los dos puntos. En casos muy raros, si no se encuentra un terminador NULL en la memoria, el sistema puede bloquearse porque el iterador de cadena se desbordará, lo que puede provocar el acceso a la memoria no asignada por encima de la pila. Por lo tanto, solucione este problema reemplazando outbound_name con el nombre del recurso solicitado anteriormente. Con los cambios aplicados, el resultado será el siguiente: $ cat /proc/iomem 30000000-37ffffff : memory2 38000000-3fffffff : memory3 [kwilczynski: commit log]"
    }
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  "lastModified": "2026-07-30T06:21:32.150",
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