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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.
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.
Metrics
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Title: el kernel de Linux, Description: En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad:
net: wwan: t7xx: validar port_count contra la longitud del mensaje en t7xx_port_enum_msg_handler
t7xx_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.
Añadir 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.
Añadir una verificación struct_size() después de extraer port_count y antes del bucle.
En 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.
Pasar 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.
Initial Analysis by NIST6/26/2026 1:29:15 PM
Action
Type
Old Value
New Value
Added
CWE
CWE-125
Added
CPE Configuration
OR
*cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*
*cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*
*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.30
*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.0.7
*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.88
*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.140
*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.19 up to (excluding) 6.1.176
Added
Reference Type
CVE: http://www.openwall.com/lists/oss-security/2026/06/18/1 Types: Mailing List
New CVE Received from kernel.org5/21/2026 9:16:18 AM
Action
Type
Old Value
New Value
Added
Description
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.
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.
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