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CVE-2026-6682

Estado: AnalizadaAlta (7.6)—

In FatFS R0.16 and earlier contains a FAT32 integer overflow bug in mount_volume() where fasize *= fs->n_fats can wrap, leading to attacker-controlled file-size metadata and unsafe read lengths in downstream callers. This maps to CWE-190 (Integer Overflow or Wraparound). Estimated CVSS v3.1 vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H (7.6, High). Remote delivery is also possible in OTA/update pipelines. The estimated CISA SSVC vectors are Exploitation: PoC, Technical Impact: Total.

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.

AV:P indica acceso físico a medios extraíbles (tarjeta SD/USB con imagen FAT32 malformada). Integer overflow en mount_volume() permite desbordamiento de buffer y ejecución de código. El overflow controla metadata de archivos, habilitando lectura y manipulación de datos.

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

Behavior Prevention on EndpointDisable or Remove Feature or ProgramRestrict Web-Based ContentRestrict File and Directory PermissionsPrivileged Account ManagementRemote Data Storage

Tecnologías afectadas (1)

Elm-chan — Fatfs

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-6682",
  "cveTags": [],
  "metrics": {
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          "options": [
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            },
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            },
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            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-07-01T15:23:46.354718Z"
        }
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          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
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  "weaknesses": [
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    }
  ],
  "lastModified": "2026-07-02T14:37:48.377",
  "configurations": [
    {
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}