CVE-2025-38086
Estado: AnalizadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
net: ch9200: fix uninitialised access during mii_nway_restart
In mii_nway_restart() the code attempts to call mii->mdio_read which is ch9200_mdio_read(). ch9200_mdio_read() utilises a local buffer called "buff", which is initialised with control_read(). However "buff" is conditionally initialised inside control_read():
If the condition of "err == size" is not met, then "buff" remains uninitialised. Once this happens the uninitialised "buff" is accessed and returned during ch9200_mdio_read():
The problem stems from the fact that ch9200_mdio_read() ignores the return value of control_read(), leading to uinit-access of "buff".
Leer descripción completaMostrar menos
To fix this we should check the return value of control_read() and return early on error.
Detalles técnicos trazas, registros y código del informe original
if (err == size) {
memcpy(data, buf, size);
}
return (buff[0] | buff[1] << 8);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: 0.20%
- Percentil entre todas las CVEs puntuadas: 9
- 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 (2)
CWE
- CWE-908
Referencias
- https://git.kernel.org/stable/c/119766de4930ff40db9f36b960cb53b0c400e81b
- https://git.kernel.org/stable/c/33163c68d2e3061fa3935b5f0a1867958b1cdbd2
- https://git.kernel.org/stable/c/4da7fcc098218ff92b2e83a43f545c02f714cedd
- https://git.kernel.org/stable/c/6bd2569d0b2f918e9581f744df0263caf73ee76c
- https://git.kernel.org/stable/c/9a350f30d65197354706b7759b5c89d6c267b1a9
- https://git.kernel.org/stable/c/9ad0452c0277b816a435433cca601304cfac7c21
- https://git.kernel.org/stable/c/9da3e442714f7f4393ff01c265c4959c03e88c2f
- https://git.kernel.org/stable/c/cdaa6d1cb2ff1219c6c822b27655dd170ffb0f72
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ch9200: fix uninitialised access during mii_nway_restart\n\nIn mii_nway_restart() the code attempts to call\nmii->mdio_read which is ch9200_mdio_read(). ch9200_mdio_read()\nutilises a local buffer called \"buff\", which is initialised\nwith control_read(). However \"buff\" is conditionally\ninitialised inside control_read():\n\n if (err == size) {\n memcpy(data, buf, size);\n }\n\nIf the condition of \"err == size\" is not met, then\n\"buff\" remains uninitialised. Once this happens the\nuninitialised \"buff\" is accessed and returned during\nch9200_mdio_read():\n\n return (buff[0] | buff[1] << 8);\n\nThe problem stems from the fact that ch9200_mdio_read()\nignores the return value of control_read(), leading to\nuinit-access of \"buff\".\n\nTo fix this we should check the return value of\ncontrol_read() and return early on error."
},
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: ch9200: corrección del acceso no inicializado durante mii_nway_restart. En mii_nway_restart(), el código intenta llamar a mii->mdio_read, que es ch9200_mdio_read(). ch9200_mdio_read() utiliza un búfer local llamado \"buff\", que se inicializa con control_read(). Sin embargo, \"buff\" se inicializa condicionalmente dentro de control_read(): if (err == size) { memcpy(data, buf, size); } Si no se cumple la condición \"err == size\", \"buff\" permanece sin inicializar. Una vez que esto sucede, se accede al \"buff\" no inicializado y se devuelve durante ch9200_mdio_read(): return (buff[0] | buff[1] << 8); El problema se debe a que ch9200_mdio_read() ignora el valor de retorno de control_read(), lo que provoca un acceso uinit a \"buff\". Para solucionarlo, debemos comprobar el valor de retorno de control_read() y devolver el error antes de tiempo."
}
],
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