CVE-2026-43495

Estado: AnalizadaAlta (8.8)—

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

net: wwan: t7xx: validate port_count against message length in t7xx_port_enum_msg_handler

t7xx_port_enum_msg_handler() uses the modem-supplied port_count field as a loop bound over port_msg->data[] without checking that the message buffer contains sufficient data. A modem sending port_count=65535 in a 12-byte buffer triggers a slab-out-of-bounds read of up to 262140 bytes.

Add a sizeof(*port_msg) check before accessing the port message header fields to guard against undersized messages.

Add a struct_size() check after extracting port_count and before the loop.

Leer descripción completaMostrar menos

In t7xx_parse_host_rt_data(), guard the rt_feature header read with a remaining-buffer check before accessing data_len, validate feat_data_len against the actual remaining buffer to prevent OOB reads and signed integer overflow on offset.

Pass msg_len from both call sites: skb->len at the DPMAIF path after skb_pull(), and the validated feat_data_len at the handshake path.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 8.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.40%
Percentil entre todas las CVEs puntuadas: 32
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.

ExplotaciónT1210 Exploitation of Remote Serviceslateral movement85 %
Impacto principalT1005 Data from Local Systemcollection80 %

AV:A (red adyacente) sin privilegios sugiere T1210. El desbordamiento de búfer (CWE-125) permite lectura de memoria del kernel (T1005) sin ejecución de comandos demostrada.

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

Vulnerability Scanning Threat Intelligence Program Privileged Account Management Network Segmentation Disable or Remove Feature or Program Application Isolation and Sandboxing

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: wwan: t7xx: validate port_count against message length in t7xx_port_enum_msg_handler\n\nt7xx_port_enum_msg_handler() uses the modem-supplied port_count field as\na loop bound over port_msg->data[] without checking that the message buffer\ncontains sufficient data. A modem sending port_count=65535 in a 12-byte\nbuffer triggers a slab-out-of-bounds read of up to 262140 bytes.\n\nAdd a sizeof(*port_msg) check before accessing the port message header\nfields to guard against undersized messages.\n\nAdd a struct_size() check after extracting port_count and before the loop.\n\nIn t7xx_parse_host_rt_data(), guard the rt_feature header read with a\nremaining-buffer check before accessing data_len, validate feat_data_len\nagainst the actual remaining buffer to prevent OOB reads and signed\ninteger overflow on offset.\n\nPass msg_len from both call sites: skb->len at the DPMAIF path after\nskb_pull(), and the validated feat_data_len at the handshake path."
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad:\n\nnet: wwan: t7xx: validar port_count contra la longitud del mensaje en t7xx_port_enum_msg_handler\n\nt7xx_port_enum_msg_handler() utiliza el campo port_count suministrado por el módem como límite de bucle sobre port_msg->data[] sin verificar que el búfer del mensaje contenga datos suficientes. Un módem que envía port_count=65535 en un búfer de 12 bytes desencadena una lectura fuera de límites de slab de hasta 262140 bytes.\n\nAñadir una verificación sizeof(port_msg) antes de acceder a los campos de la cabecera del mensaje del puerto para proteger contra mensajes de tamaño insuficiente.\n\nAñadir una verificación struct_size() después de extraer port_count y antes del bucle.\n\nEn t7xx_parse_host_rt_data(), proteger la lectura de la cabecera rt_feature con una verificación del búfer restante antes de acceder a data_len, validar feat_data_len contra el búfer restante real para prevenir lecturas OOB y desbordamiento de entero con signo en el desplazamiento.\n\nPasar msg_len desde ambos sitios de llamada: skb->len en la ruta DPMAIF después de skb_pull(), y el feat_data_len validado en la ruta de handshake."
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