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CVE-2022-50131

Estado: ModificadaAlta (7.8)—

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

HID: mcp2221: prevent a buffer overflow in mcp_smbus_write()

Smatch Warning: drivers/hid/hid-mcp2221.c:388 mcp_smbus_write() error: __memcpy() '&mcp->txbuf[5]' too small (59 vs 255) drivers/hid/hid-mcp2221.c:388 mcp_smbus_write() error: __memcpy() 'buf' too small (34 vs 255)

The 'len' variable can take a value between 0-255 as it can come from data->block[0] and it is user data. So add an bound check to prevent a buffer overflow in memcpy().

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vuln. local (AV:L/PR:L) sin interacción: escalada privilegios mediante buffer overflow en driver HID/SMBus. Overflow permite ejecución de código arbitrario en kernel context (I:H, A:H).

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Execution PreventionThreat Intelligence ProgramRestrict Web-Based ContentPrivileged Account ManagementLimit Software InstallationFilter Network Traffic

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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          "value": "CWE-787"
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: mcp2221: prevent a buffer overflow in mcp_smbus_write()\n\nSmatch Warning:\ndrivers/hid/hid-mcp2221.c:388 mcp_smbus_write() error: __memcpy()\n'&mcp->txbuf[5]' too small (59 vs 255)\ndrivers/hid/hid-mcp2221.c:388 mcp_smbus_write() error: __memcpy() 'buf'\ntoo small (34 vs 255)\n\nThe 'len' variable can take a value between 0-255 as it can come from\ndata->block[0] and it is user data. So add an bound check to prevent a\nbuffer overflow in memcpy()."
    },
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: HID: mcp2221: evitar un desbordamiento de búfer en mcp_smbus_write() Advertencia de Smatch: drivers/hid/hid-mcp2221.c:388 Error de mcp_smbus_write(): __memcpy() '&mcp->txbuf[5]' demasiado pequeño (59 frente a 255) drivers/hid/hid-mcp2221.c:388 Error de mcp_smbus_write(): __memcpy() 'buf' demasiado pequeño (34 frente a 255) La variable 'len' puede tomar un valor entre 0 y 255, ya que puede provenir de data->block[0] y son datos de usuario. Por lo tanto, agregue una comprobación de límite para evitar un desbordamiento de búfer en memcpy()."
    }
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