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CVE-2026-23078

Estado: AnalizadaAlta (7.8)—

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

ALSA: scarlett2: Fix buffer overflow in config retrieval

The scarlett2_usb_get_config() function has a logic error in the endianness conversion code that can cause buffer overflows when count > 1.

The code checks `if (size == 2)` where `size` is the total buffer size in bytes, then loops `count` times treating each element as u16 (2 bytes). This causes the loop to access `count * 2` bytes when the buffer only has `size` bytes allocated.

Fix by checking the element size (config_item->size) instead of the total buffer size. This ensures the endianness conversion matches the actual element type.

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.

Buffer overflow en kernel (CWE-787) con acceso local (AV:L/PR:L) permite escalada de privilegios. La corrupción de memoria en ALSA puede derivar en ejecución de código o negación de servicio.

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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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: scarlett2: Fix buffer overflow in config retrieval\n\nThe scarlett2_usb_get_config() function has a logic error in the\nendianness conversion code that can cause buffer overflows when\ncount > 1.\n\nThe code checks `if (size == 2)` where `size` is the total buffer size in\nbytes, then loops `count` times treating each element as u16 (2 bytes).\nThis causes the loop to access `count * 2` bytes when the buffer only\nhas `size` bytes allocated.\n\nFix by checking the element size (config_item->size) instead of the\ntotal buffer size. This ensures the endianness conversion matches the\nactual element type."
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      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nALSA: scarlett2: Corrección de desbordamiento de búfer en la recuperación de configuración\n\nLa función scarlett2_usb_get_config() tiene un error lógico en el código de conversión de endianness que puede causar desbordamientos de búfer cuando count > 1.\n\nEl código comprueba 'if (size == 2)' donde 'size' es el tamaño total del búfer en bytes, luego itera 'count' veces tratando cada elemento como u16 (2 bytes). Esto hace que el bucle acceda a 'count * 2' bytes cuando el búfer solo tiene 'size' bytes asignados.\n\nSolución comprobando el tamaño del elemento (config_item->size) en lugar del tamaño total del búfer. Esto asegura que la conversión de endianness coincida con el tipo de elemento real."
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