CVE-2026-64347
Estado: AnalizadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
usb: gadget: composite: fix dead empty check in the USB_DT_OTG handler
The OTG branch of composite_setup() falls back to the first configuration when none is selected:
list_first_entry() never returns NULL. On an empty list it returns container_of() of the list head. So the "if (!config)" check is dead.
When cdev->configs is empty, config points at the head inside struct usb_composite_dev. config->descriptors[0] reads whatever sits at that offset. The memcpy copies up to w_length bytes of it into the response buffer.
cdev->configs can be empty in two cases. One is a teardown race on gadget unbind with a control transfer in flight. The other is a driver that sets is_otg before it adds a config.
Leer descripción completaMostrar menos
A reproducer that holds cdev->configs empty triggers a KASAN fault in this branch.
Use list_first_entry_or_null() so the existing check does its job.
Detalles técnicos trazas, registros y código del informe original
if (cdev->config) config = cdev->config; else config = list_first_entry(&cdev->configs, struct usb_configuration, list); if (!config) goto done; ... memcpy(req->buf, config->descriptors[0], value);
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.10%
- Percentil entre todas las CVEs puntuadas: 1
- 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).
Tecnologías afectadas (1)
CWE
- CWE-667
Referencias
- https://git.kernel.org/stable/c/01feaf024f29618d5ffa7ab0fd858e0579dcbf7b
- https://git.kernel.org/stable/c/2454264b2ab4cf0055c0bfd39e79f830452bd0db
- https://git.kernel.org/stable/c/56add2b9b2e89ec61c0761165d758f73004fdfdf
- https://git.kernel.org/stable/c/8ac463fe6c0f85bdb1ce8c30e8c9e060802e4483
- https://git.kernel.org/stable/c/91b3ecd34b60f950c50c560974945b6596a6f207
- https://git.kernel.org/stable/c/d3e72cfef2e38bd588055739a8100d14f9773b17
- https://git.kernel.org/stable/c/f8f680609c2b3ab795ffcd6f21585b6dfc46d395
- https://git.kernel.org/stable/c/fcb21bf747640c9d6bd1eda9da85420f076d59c1
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: composite: fix dead empty check in the USB_DT_OTG handler\n\nThe OTG branch of composite_setup() falls back to the first\nconfiguration when none is selected:\n\n\tif (cdev->config)\n\t\tconfig = cdev->config;\n\telse\n\t\tconfig = list_first_entry(&cdev->configs,\n\t\t\t\t\t struct usb_configuration, list);\n\tif (!config)\n\t\tgoto done;\n\t...\n\tmemcpy(req->buf, config->descriptors[0], value);\n\nlist_first_entry() never returns NULL. On an empty list it returns\ncontainer_of() of the list head. So the \"if (!config)\" check is dead.\n\nWhen cdev->configs is empty, config points at the head inside struct\nusb_composite_dev. config->descriptors[0] reads whatever sits at that\noffset. The memcpy copies up to w_length bytes of it into the response\nbuffer.\n\ncdev->configs can be empty in two cases. One is a teardown race on\ngadget unbind with a control transfer in flight. The other is a driver\nthat sets is_otg before it adds a config. A reproducer that holds\ncdev->configs empty triggers a KASAN fault in this branch.\n\nUse list_first_entry_or_null() so the existing check does its job."
}
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