CVE-2025-38665
Estado: AnalizadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
can: netlink: can_changelink(): fix NULL pointer deref of struct can_priv::do_set_mode
Andrei Lalaev reported a NULL pointer deref when a CAN device is restarted from Bus Off and the driver does not implement the struct can_priv::do_set_mode callback.
There are 2 code path that call struct can_priv::do_set_mode: - directly by a manual restart from the user space, via can_changelink() - delayed automatic restart after bus off (deactivated by default)
To prevent the NULL pointer deference, refuse a manual restart or configure the automatic restart delay in can_changelink() and report the error via extack to user space.
Leer descripción completaMostrar menos
As an additional safety measure let can_restart() return an error if can_priv::do_set_mode is not set instead of dereferencing it unchecked.
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: 0.15%
- Percentil entre todas las CVEs puntuadas: 4
- 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 (2)
CWE
- CWE-476
Referencias
- https://git.kernel.org/stable/c/0ca816a96fdcf32644c80cbe7a82c7b6ce6ddda5
- https://git.kernel.org/stable/c/6acceb46180f9e160d4f0c56fcaf39ba562822ae
- https://git.kernel.org/stable/c/6bbcf37c5114926c99a1d1e6993a5b35689d2599
- https://git.kernel.org/stable/c/c1f3f9797c1f44a762e6f5f72520b2e520537b52
- https://git.kernel.org/stable/c/cf81a60a973358dea163f6b14062f17831ceb894
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
JSON original (NVD)
Mostrar
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: can: netlink: can_changelink(): corrige la desreferencia del puntero NULL de struct can_priv::do_set_mode Andrei Lalaev informó de una desreferencia del puntero NULL cuando un dispositivo CAN se reinicia desde Bus Off y el controlador no implementa la devolución de llamada struct can_priv::do_set_mode. Hay 2 rutas de código que llaman a struct can_priv::do_set_mode: - directamente mediante un reinicio manual desde el espacio de usuario, a través de can_changelink() - reinicio automático retrasado después de apagar el bus (desactivado de forma predeterminada) Para evitar la deferencia del puntero NULL, rechace un reinicio manual o configure el retraso del reinicio automático en can_changelink() e informe del error a través de extack al espacio de usuario. Como medida de seguridad adicional, deje que can_restart() devuelva un error si can_priv::do_set_mode no está configurado en lugar de desreferenciarlo sin marcar."
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