CVE-2024-56670
Estado: ModificadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
usb: gadget: u_serial: Fix the issue that gs_start_io crashed due to accessing null pointer
Considering that in some extreme cases, when u_serial driver is accessed by multiple threads, Thread A is executing the open operation and calling the gs_open, Thread B is executing the disconnect operation and calling the gserial_disconnect function,The port->port_usb pointer will be set to NULL.
This causes thread A to access a null pointer (port->port_usb is null) when calling the gs_free_requests function, causing a crash.
If port_usb is NULL, the release request will be skipped as it will be done by gserial_disconnect.
Leer descripción completaMostrar menos
So add a null pointer check to gs_start_io before attempting to access the value of the pointer port->port_usb.
Detalles técnicos trazas, registros y código del informe original
E.g.
Thread A Thread B
gs_open() gadget_unbind_driver()
gs_start_io() composite_disconnect()
gs_start_rx() gserial_disconnect()
... ...
spin_unlock(&port->port_lock)
status = usb_ep_queue() spin_lock(&port->port_lock)
spin_lock(&port->port_lock) port->port_usb = NULL
gs_free_requests(port->port_usb->in) spin_unlock(&port->port_lock)
Crash
Call trace:
gs_start_io+0x164/0x25c
gs_open+0x108/0x13c
tty_open+0x314/0x638
chrdev_open+0x1b8/0x258
do_dentry_open+0x2c4/0x700
vfs_open+0x2c/0x3c
path_openat+0xa64/0xc60
do_filp_open+0xb8/0x164
do_sys_openat2+0x84/0xf0
__arm64_sys_openat+0x70/0x9c
invoke_syscall+0x58/0x114
el0_svc_common+0x80/0xe0
do_el0_svc+0x1c/0x28
el0_svc+0x38/0x68CVSS
- 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: 0.23%
- 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).
Tecnologías afectadas (1)
CWE
- CWE-476
- CWE-476
Referencias
- https://git.kernel.org/stable/c/1247e1df086aa6c17ab53cd1bedce70dd7132765
- https://git.kernel.org/stable/c/28b3c03a6790de1f6f2683919ad657840f0f0f58
- https://git.kernel.org/stable/c/4cfbca86f6a8b801f3254e0e3c8f2b1d2d64be2b
- https://git.kernel.org/stable/c/4efdfdc32d8d6307f968cd99f1db64468471bab1
- https://git.kernel.org/stable/c/8ca07a3d18f39b1669927ef536e485787e856df6
- https://git.kernel.org/stable/c/c83213b6649d22656b3a4e92544ceeea8a2c6c07
- https://git.kernel.org/stable/c/dd6b0ca6025f64ccb465a6a3460c5b0307ed9c44
- https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html
- https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: u_serial: Fix the issue that gs_start_io crashed due to accessing null pointer\n\nConsidering that in some extreme cases,\nwhen u_serial driver is accessed by multiple threads,\nThread A is executing the open operation and calling the gs_open,\nThread B is executing the disconnect operation and calling the\ngserial_disconnect function,The port->port_usb pointer will be set to NULL.\n\nE.g.\n Thread A Thread B\n gs_open() gadget_unbind_driver()\n gs_start_io() composite_disconnect()\n gs_start_rx() gserial_disconnect()\n ... ...\n spin_unlock(&port->port_lock)\n status = usb_ep_queue() spin_lock(&port->port_lock)\n spin_lock(&port->port_lock) port->port_usb = NULL\n gs_free_requests(port->port_usb->in) spin_unlock(&port->port_lock)\n Crash\n\nThis causes thread A to access a null pointer (port->port_usb is null)\nwhen calling the gs_free_requests function, causing a crash.\n\nIf port_usb is NULL, the release request will be skipped as it\nwill be done by gserial_disconnect.\n\nSo add a null pointer check to gs_start_io before attempting\nto access the value of the pointer port->port_usb.\n\nCall trace:\n gs_start_io+0x164/0x25c\n gs_open+0x108/0x13c\n tty_open+0x314/0x638\n chrdev_open+0x1b8/0x258\n do_dentry_open+0x2c4/0x700\n vfs_open+0x2c/0x3c\n path_openat+0xa64/0xc60\n do_filp_open+0xb8/0x164\n do_sys_openat2+0x84/0xf0\n __arm64_sys_openat+0x70/0x9c\n invoke_syscall+0x58/0x114\n el0_svc_common+0x80/0xe0\n do_el0_svc+0x1c/0x28\n el0_svc+0x38/0x68"
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: usb: gadget: u_serial: soluciona el problema por el cual gs_start_io se bloqueaba debido al acceso a un puntero nulo. Teniendo en cuenta que en algunos casos extremos, cuando varios subprocesos acceden al controlador u_serial, el subproceso A ejecuta la operación de apertura y llama a gs_open, el subproceso B ejecuta la operación de desconexión y llama a la función gserial_disconnect, el puntero port->port_usb se establecerá en NULL. P. ej. Hilo A Hilo B gs_open() gadget_unbind_driver() gs_start_io() composite_disconnect() gs_start_rx() gserial_disconnect() ... ... spin_unlock(&port->port_lock) status = usb_ep_queue() spin_lock(&port->port_lock) spin_lock(&port->port_lock) port->port_usb = NULL gs_free_requests(port->port_usb->in) spin_unlock(&port->port_lock) Bloqueo Esto hace que el hilo A acceda a un puntero nulo (port->port_usb es nulo) al llamar a la función gs_free_requests, lo que provoca un bloqueo. Si port_usb es NULL, se omitirá la solicitud de liberación, ya que la realizará gserial_disconnect. Por lo tanto, agregue una verificación de puntero nulo a gs_start_io antes de intentar acceder al valor del puntero port->port_usb. Rastreo de llamadas: gs_start_io+0x164/0x25c gs_open+0x108/0x13c tty_open+0x314/0x638 chrdev_open+0x1b8/0x258 do_dentry_open+0x2c4/0x700 vfs_open+0x2c/0x3c path_openat+0xa64/0xc60 do_filp_open+0xb8/0x164 do_sys_openat2+0x84/0xf0 __arm64_sys_openat+0x70/0x9c invocar_syscall+0x58/0x114 el0_svc_common+0x80/0xe0 do_el0_svc+0x1c/0x28 el0_svc+0x38/0x68"
}
],
"lastModified": "2026-06-17T08:12:42.350",
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