fkie_cve-2025-38257
Vulnerability from fkie_nvd
Published
2025-07-09 11:15
Modified
2025-07-10 15:15
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: s390/pkey: Prevent overflow in size calculation for memdup_user() Number of apqn target list entries contained in 'nr_apqns' variable is determined by userspace via an ioctl call so the result of the product in calculation of size passed to memdup_user() may overflow. In this case the actual size of the allocated area and the value describing it won't be in sync leading to various types of unpredictable behaviour later. Use a proper memdup_array_user() helper which returns an error if an overflow is detected. Note that it is different from when nr_apqns is initially zero - that case is considered valid and should be handled in subsequent pkey_handler implementations. Found by Linux Verification Center (linuxtesting.org).
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/73483ca7e07a5e39bdf612eec9d3d293e8bef649
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7360ee47599af91a1d5f4e74d635d9408a54e489
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/88f3869649edbc4a13f6c2877091f81cd5a50f05
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ad1bdd24a02d5a8d119af8e4cd50933780a6d29f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f855b119e62b004a5044ed565f2a2b368c4d3f16
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/faa1ab4a23c42e34dc000ef4977b751d94d5148c
Impacted products
Vendor Product Version


To clipboard 

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/pkey: Prevent overflow in size calculation for memdup_user()\n\nNumber of apqn target list entries contained in \u0027nr_apqns\u0027 variable is\ndetermined by userspace via an ioctl call so the result of the product in\ncalculation of size passed to memdup_user() may overflow.\n\nIn this case the actual size of the allocated area and the value\ndescribing it won\u0027t be in sync leading to various types of unpredictable\nbehaviour later.\n\nUse a proper memdup_array_user() helper which returns an error if an\noverflow is detected. Note that it is different from when nr_apqns is\ninitially zero - that case is considered valid and should be handled in\nsubsequent pkey_handler implementations.\n\nFound by Linux Verification Center (linuxtesting.org)."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: s390/pkey: Evitar el desbordamiento en el c\u00e1lculo del tama\u00f1o para memdup_user() El n\u00famero de entradas de la lista de destino apqn contenidas en la variable \u0027nr_apqns\u0027 est\u00e1 determinado por el espacio de usuario a trav\u00e9s de una llamada ioctl, por lo que el resultado del producto en el c\u00e1lculo del tama\u00f1o pasado a memdup_user() puede desbordarse. En este caso, el tama\u00f1o real del \u00e1rea asignada y el valor que lo describe no estar\u00e1n sincronizados, lo que provocar\u00e1 varios tipos de comportamiento impredecible m\u00e1s adelante. Utilice un ayudante memdup_array_user() adecuado que devuelva un error si se detecta un desbordamiento. Tenga en cuenta que es diferente de cuando nr_apqns es inicialmente cero: ese caso se considera v\u00e1lido y debe manejarse en implementaciones posteriores de pkey_handler. Encontrado por el Centro de verificaci\u00f3n de Linux (linuxtesting.org)."
    }
  ],
  "id": "CVE-2025-38257",
  "lastModified": "2025-07-10T15:15:27.730",
  "metrics": {},
  "published": "2025-07-09T11:15:27.993",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/73483ca7e07a5e39bdf612eec9d3d293e8bef649"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7360ee47599af91a1d5f4e74d635d9408a54e489"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/88f3869649edbc4a13f6c2877091f81cd5a50f05"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ad1bdd24a02d5a8d119af8e4cd50933780a6d29f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f855b119e62b004a5044ed565f2a2b368c4d3f16"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/faa1ab4a23c42e34dc000ef4977b751d94d5148c"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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