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CVE-2019-3701

Estado: ModificadaMedia (4.4)—

Fue encontrado un problemaa en el parametro can_can_gw_rcv en el archivo net/ can/gw.c en el kernel de Linux hasta la versión 4.19.13. Las reglas de modificación de la CAN frame permiten operaciones lógicas a nivel de bits que también se pueden aplicar en el campo can_dlc. El usuario con privilegios "root" con CAP_NET_ADMIN puede crear una regla de modificación de CAN frame que genera que el código de longitud de datos tenga un valor más alto que el tamaño de datos que CAN frame tenga disponible.

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En combinación con un cálculo de suma de comprobación configurado donde el resultado se almacena en relación con el final de los datos (por ejemplo, cgw_csum_xor_rel), se puede escribir de nuevo en la cola del skb (por ejemplo, el puntero frag_list en skb_shared_info), lo que finalmente puede ocasionar un fallo del sistema. a causa de la falta de una comprobación, los controladores CAN pueden escribir contenido arbitrario más allá de los registros de datos en la memoria de Entrada/Salida del controlador CAN durante el procesamiento de tramas salientes manipuladas con gw.

CVSS

Probabilidad de explotación (EPSS)

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 (3)

Canonical — Ubuntu LinuxDebian — Debian LinuxLinux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2019-3701",
  "cveTags": [],
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          "authentication": "NONE",
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          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "NONE"
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        "obtainAllPrivilege": false,
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          "vectorString": "CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H",
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          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "HIGH",
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  "vulnStatus": "Modified",
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      "description": [
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          "lang": "en",
          "value": "CWE-787"
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      "value": "An issue was discovered in can_can_gw_rcv in net/can/gw.c in the Linux kernel through 4.19.13. The CAN frame modification rules allow bitwise logical operations that can be also applied to the can_dlc field. The privileged user \"root\" with CAP_NET_ADMIN can create a CAN frame modification rule that makes the data length code a higher value than the available CAN frame data size. In combination with a configured checksum calculation where the result is stored relatively to the end of the data (e.g. cgw_csum_xor_rel) the tail of the skb (e.g. frag_list pointer in skb_shared_info) can be rewritten which finally can cause a system crash. Because of a missing check, the CAN drivers may write arbitrary content beyond the data registers in the CAN controller's I/O memory when processing can-gw manipulated outgoing frames."
    },
    {
      "lang": "es",
      "value": "Fue encontrado un problemaa en el parametro can_can_gw_rcv en el archivo net/ can/gw.c en el kernel de Linux hasta la versión 4.19.13. Las reglas de modificación de la CAN frame permiten operaciones lógicas a nivel de bits que también se pueden aplicar en el campo can_dlc. El usuario con privilegios \"root\" con CAP_NET_ADMIN puede crear una regla de modificación de CAN frame que genera que el código de longitud de datos tenga un valor más alto que el tamaño de datos que CAN frame tenga disponible. En combinación con un cálculo de suma de comprobación configurado donde el resultado se almacena en relación con el final de los datos (por ejemplo, cgw_csum_xor_rel), se puede escribir de nuevo en la cola del skb (por ejemplo, el puntero frag_list en skb_shared_info), lo que finalmente puede ocasionar un fallo del sistema. a causa de la falta de una comprobación, los controladores CAN pueden escribir contenido arbitrario más allá de los registros de datos en la memoria de Entrada/Salida del controlador CAN durante el procesamiento de tramas salientes manipuladas con gw."
    }
  ],
  "lastModified": "2026-06-17T02:35:24.950",
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