CVE-2025-38257

Estado: ModificadaAlta (7.8)—

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.

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Found by Linux Verification Center (linuxtesting.org).

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 7.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.17%
Percentil entre todas las CVEs puntuadas: 5
Fecha de la puntuación: 6/10/2026

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation85 %
Impacto principalT1059 Command and Scripting Interpreterexecution70 %
Impacto secundarioT1565.001 Stored Data Manipulationimpact65 %

Vulnerabilidad de desbordamiento en cálculo de tamaño en controlador s390/pkey con acceso local (AV:L, PR:L) sin interacción. Permite ejecución de código arbitrario y corrupción de memoria tras escalada de privilegios.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Execution Prevention Threat Intelligence Program Restrict Web-Based Content Restrict File and Directory Permissions Privileged Account Management Remote Data Storage

Tecnologías afectadas (2)

Debian — Debian Linux Linux — Linux Kernel

CWE

NVD-CWE-noinfo

Referencias

JSON original (NVD)

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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 'nr_apqns' 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't 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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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: s390/pkey: Evitar el desbordamiento en el cálculo del tamaño para memdup_user() El número de entradas de la lista de destino apqn contenidas en la variable 'nr_apqns' está determinado por el espacio de usuario a través de una llamada ioctl, por lo que el resultado del producto en el cálculo del tamaño pasado a memdup_user() puede desbordarse. En este caso, el tamaño real del área asignada y el valor que lo describe no estarán sincronizados, lo que provocará varios tipos de comportamiento impredecible más 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 válido y debe manejarse en implementaciones posteriores de pkey_handler. Encontrado por el Centro de verificación de Linux (linuxtesting.org)."
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