CVE-2025-38110

Estado: ModificadaAlta (7.1)—

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

net/mdiobus: Fix potential out-of-bounds clause 45 read/write access

When using publicly available tools like 'mdio-tools' to read/write data from/to network interface and its PHY via C45 (clause 45) mdiobus, there is no verification of parameters passed to the ioctl and it accepts any mdio address. Currently there is support for 32 addresses in kernel via PHY_MAX_ADDR define, but it is possible to pass higher value than that via ioctl. While read/write operation should generally fail in this case, mdiobus provides stats array, where wrong address may allow out-of-bounds read/write.

Leer descripción completaMostrar menos

Fix that by adding address verification before C45 read/write operation. While this excludes this access from any statistics, it improves security of read/write operation.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Puntuación base: 7.1

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.20%
Percentil entre todas las CVEs puntuadas: 9
Fecha de la puntuación: 5/10/2026

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 principalT1005 Data from Local Systemcollection80 %
Impacto secundarioT1565 Data Manipulationimpact75 %

AV:L, PR:L sin UI; acceso local con privilegios de usuario. El atacante puede leer/escribir datos del kernel fuera de límites mediante ioctl en mdiobus, causando lectura (CWE-125) y potencial corrupción de memoria del kernel.

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

Threat Intelligence Program Restrict File and Directory Permissions Remote Data Storage Network Segmentation Execution Prevention Encrypt Sensitive Information

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-125

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mdiobus: Fix potential out-of-bounds clause 45 read/write access\n\nWhen using publicly available tools like 'mdio-tools' to read/write data\nfrom/to network interface and its PHY via C45 (clause 45) mdiobus,\nthere is no verification of parameters passed to the ioctl and\nit accepts any mdio address.\nCurrently there is support for 32 addresses in kernel via PHY_MAX_ADDR define,\nbut it is possible to pass higher value than that via ioctl.\nWhile read/write operation should generally fail in this case,\nmdiobus provides stats array, where wrong address may allow out-of-bounds\nread/write.\n\nFix that by adding address verification before C45 read/write operation.\nWhile this excludes this access from any statistics, it improves security of\nread/write operation."
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/mdiobus: Arregla el potencial acceso de lectura/escritura fuera de los límites de la cláusula 45 Cuando se usan herramientas disponibles públicamente como 'mdio-tools' para leer/escribir datos desde/hacia la interfaz de red y su PHY a través de C45 (cláusula 45) mdiobus, no hay verificación de los parámetros pasados a ioctl y acepta cualquier dirección mdio. Actualmente hay soporte para 32 direcciones en el kernel a través de la definición PHY_MAX_ADDR, pero es posible pasar un valor más alto que ese a través de ioctl. Si bien la operación de lectura/escritura generalmente debería fallar en este caso, mdiobus proporciona una matriz de estadísticas, donde la dirección incorrecta puede permitir lectura/escritura fuera de los límites. Arregla eso agregando la verificación de dirección antes de la operación de lectura/escritura C45. Si bien esto excluye este acceso de cualquier estadística, mejora la seguridad de la operación de lectura/escritura."
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