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CVE-2025-21656

Estado: AnalizadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

hwmon: (drivetemp) Fix driver producing garbage data when SCSI errors occur

scsi_execute_cmd() function can return both negative (linux codes) and positive (scsi_cmnd result field) error codes.

Currently the driver just passes error codes of scsi_execute_cmd() to hwmon core, which is incorrect because hwmon only checks for negative error codes. This leads to hwmon reporting uninitialized data to userspace in case of SCSI errors (for example if the disk drive was disconnected).

This patch checks scsi_execute_cmd() output and returns -EIO if it's error code is positive.

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[groeck: Avoid inline variable declaration for portability]

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 (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
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        "impactScore": 3.6,
        "exploitabilityScore": 1.8
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          "programFiles": [
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  "published": "2025-01-21T13:15:09.240",
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          "value": "NVD-CWE-noinfo"
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (drivetemp) Fix driver producing garbage data when SCSI errors occur\n\nscsi_execute_cmd() function can return both negative (linux codes) and\npositive (scsi_cmnd result field) error codes.\n\nCurrently the driver just passes error codes of scsi_execute_cmd() to\nhwmon core, which is incorrect because hwmon only checks for negative\nerror codes. This leads to hwmon reporting uninitialized data to\nuserspace in case of SCSI errors (for example if the disk drive was\ndisconnected).\n\nThis patch checks scsi_execute_cmd() output and returns -EIO if it's\nerror code is positive.\n\n[groeck: Avoid inline variable declaration for portability]"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: hwmon: (drivetemp) Se soluciona que el controlador produzca datos basura cuando se producen errores SCSI. La función scsi_execute_cmd() puede devolver códigos de error negativos (códigos de Linux) y positivos (campo de resultado scsi_cmnd). Actualmente, el controlador solo pasa los códigos de error de scsi_execute_cmd() al núcleo de hwmon, lo que es incorrecto porque hwmon solo verifica los códigos de error negativos. Esto hace que hwmon informe datos no inicializados al espacio de usuario en caso de errores SCSI (por ejemplo, si la unidad de disco se desconectó). Este parche verifica la salida de scsi_execute_cmd() y devuelve -EIO si su código de error es positivo. [groeck: Evite la declaración de variables en línea para la portabilidad]"
    }
  ],
  "lastModified": "2026-06-17T08:43:56.893",
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