CVE-2025-21742

Estado: ModificadaAlta (7.1)—

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

usbnet: ipheth: use static NDP16 location in URB

Original code allowed for the start of NDP16 to be anywhere within the URB based on the `wNdpIndex` value in NTH16. Only the start position of NDP16 was checked, so it was possible for even the fixed-length part of NDP16 to extend past the end of URB, leading to an out-of-bounds read.

On iOS devices, the NDP16 header always directly follows NTH16. Rely on and check for this specific format.

This, along with NCM-specific minimal URB length check that already exists, will ensure that the fixed-length part of NDP16 plus a set amount of DPEs fit within the URB.

Leer descripción completaMostrar menos

Note that this commit alone does not fully address the OoB read. The limit on the amount of DPEs needs to be enforced separately.

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: 0.22%
Percentil entre todas las CVEs puntuadas: 12
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 escalation75 %
Impacto principalT1005 Data from Local Systemcollection65 %

Vulnerabilidad de lectura fuera de límites (CWE-125) en kernel Linux accesible localmente (AV:L, PR:L) sin interacción. Permite leer memoria del kernel (C:H), potencialmente exponer datos sensibles.

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 Execution Prevention Application Isolation and Sandboxing Exploit Protection Update Software Data Loss Prevention

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-125
CWE-125

Referencias

JSON original (NVD)

Mostrar

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusbnet: ipheth: use static NDP16 location in URB\n\nOriginal code allowed for the start of NDP16 to be anywhere within the\nURB based on the `wNdpIndex` value in NTH16. Only the start position of\nNDP16 was checked, so it was possible for even the fixed-length part\nof NDP16 to extend past the end of URB, leading to an out-of-bounds\nread.\n\nOn iOS devices, the NDP16 header always directly follows NTH16. Rely on\nand check for this specific format.\n\nThis, along with NCM-specific minimal URB length check that already\nexists, will ensure that the fixed-length part of NDP16 plus a set\namount of DPEs fit within the URB.\n\nNote that this commit alone does not fully address the OoB read.\nThe limit on the amount of DPEs needs to be enforced separately."
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