CVE-2022-49551

Estado: ModificadaAlta (7.1)—

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

usb: isp1760: Fix out-of-bounds array access

Running the driver through kasan gives an interesting splat:

This happens because the loop reading the regmap fields for the different ISP1760 variants look like this:

Meaning it expects the arrays to be at least HC_FIELD_MAX - 1 long.

However the arrays isp1760_hc_reg_fields[], isp1763_hc_reg_fields[], isp1763_hc_volatile_ranges[] and isp1763_dc_volatile_ranges[] are dynamically sized during compilation.

Fix this by putting an empty assignment to the [HC_FIELD_MAX] and [DC_FIELD_MAX] array member at the end of each array.

Leer descripción completaMostrar menos

This will make the array one member longer than it needs to be, but avoids the risk of overwriting whatever is inside [HC_FIELD_MAX - 1] and is simple and intuitive to read. Also add comments explaining what is going on.

Detalles técnicos trazas, registros y código del informe original

  BUG: KASAN: global-out-of-bounds in isp1760_register+0x180/0x70c
  Read of size 20 at addr f1db2e64 by task swapper/0/1
  (...)
  isp1760_register from isp1760_plat_probe+0x1d8/0x220
  (...)

  for (i = 0; i < HC_FIELD_MAX; i++) { ... }

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Puntuación base: 7.1

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.27%
Percentil entre todas las CVEs puntuadas: 17
Fecha de la puntuación: 5/10/2026

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).

🎯 Técnicas ATT&CK

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

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation85 %
Impacto principalT1059 Command and Scripting Interpreterexecution60 %
Impacto secundarioT1499 Endpoint Denial of Serviceimpact45 %

Acceso local (AV:L/PR:L) sin interacción. Out-of-bounds permite escalada de privilegios. Potencial ejecución de código o DoS por corrupción de memoria.

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 Prevention Threat Intelligence Program Restrict Web-Based Content Privileged Account Management Limit Software Installation Filter Network Traffic

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-125
CWE-125

Referencias

JSON original (NVD)

Mostrar

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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: usb: isp1760: Fix out-of-bounds array access Running the driver through kasan gives an interesting splat: BUG: KASAN: global-out-of-bounds in isp1760_register+0x180/0x70c Read of size 20 at addr f1db2e64 by task swapper/0/1 (...) isp1760_register from isp1760_plat_probe+0x1d8/0x220 (...) This happens because the loop reading the regmap fields for the different ISP1760 variants look like this: for (i = 0; i &lt; HC_FIELD_MAX; i++) { ... } Meaning it expects the arrays to be at least HC_FIELD_MAX - 1 long. However the arrays isp1760_hc_reg_fields[], isp1763_hc_reg_fields[], isp1763_hc_volatile_ranges[] and isp1763_dc_volatile_ranges[]  se dimensionan dinámicamente durante la compilación. Solucione esto colocando una asignación vacía al miembro de la matriz [HC_FIELD_MAX] y [DC_FIELD_MAX] al final de cada matriz. Esto hará que la matriz tenga un miembro más de lo que necesita ser, pero evita el riesgo de sobrescribir lo que esté dentro de [HC_FIELD_MAX - 1] y es simple e intuitivo de leer. También agregue comentarios que expliquen lo que está sucediendo."
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