FKIE_CVE-2025-38257

Vulnerability from fkie_nvd - Published: 2025-07-09 11:15 - Updated: 2025-12-18 17:07
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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/73483ca7e07a5e39bdf612eec9d3d293e8bef649Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7360ee47599af91a1d5f4e74d635d9408a54e489Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/88f3869649edbc4a13f6c2877091f81cd5a50f05Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ad1bdd24a02d5a8d119af8e4cd50933780a6d29fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f855b119e62b004a5044ed565f2a2b368c4d3f16Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/faa1ab4a23c42e34dc000ef4977b751d94d5148cPatch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlThird Party Advisory, Mailing List
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.16
linux linux_kernel 6.16
linux linux_kernel 6.16
debian debian_linux 11.0
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      "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)."
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      "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)."
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  "lastModified": "2025-12-18T17:07:52.150",
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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