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CVE-2026-5066

Estado: AnalizadaAlta (8.8)—

A potential out-of-bounds write/read exists in the TLS socket connect path of the network sockets subsystem (subsys/net/lib/sockets/sockets_tls.c). When the TLS session cache is enabled, tls_session_store() and tls_session_restore() memcpy the caller-supplied address into a fixed-size buffer using the caller-controlled addrlen value without validating it against the destination size. struct net_sockaddr is an opaque type, so an application can pass an addrlen larger than sizeof(struct net_sockaddr) (for example 128 bytes into a 24-byte stack buffer), causing the memcpy to read and write past the end of the address memory used by the TLS session cache. This out-of-bounds write can lead to a crash and denial of service, and potentially to arbitrary code execution.

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.

Vector CVSS AV:N/AC:L/PR:L/UI:N indica explotación remota con privilegios locales (T1210). El desbordamiento de búfer (CWE-787) permite ejecución de código arbitrario (T1059) y denegación de servicio (T1499.004).

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

Privileged Account ManagementDisable or Remove Feature or ProgramVulnerability ScanningThreat Intelligence ProgramRestrict Web-Based ContentNetwork Segmentation

Tecnologías afectadas (1)

Zephyrproject — Zephyr

CWE

Referencias

JSON original (NVD)

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          "timestamp": "2026-06-05T18:26:28.322491Z"
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      "value": "A potential out-of-bounds write/read exists in the TLS socket connect path of the network sockets subsystem (subsys/net/lib/sockets/sockets_tls.c). When the TLS session cache is enabled, tls_session_store() and tls_session_restore() memcpy the caller-supplied address into a fixed-size buffer using the caller-controlled addrlen value without validating it against the destination size. struct net_sockaddr is an opaque type, so an application can pass an addrlen larger than sizeof(struct net_sockaddr) (for example 128 bytes into a 24-byte stack buffer), causing the memcpy to read and write past the end of the address memory used by the TLS session cache. This out-of-bounds write can lead to a crash and denial of service, and potentially to arbitrary code execution."
    },
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      "lang": "es",
      "value": "Existe una potencial escritura/lectura fuera de límites en la ruta de conexión del socket TLS del subsistema de sockets de red (subsys/net/lib/sockets/sockets_tls.c). Cuando la caché de sesiones TLS está habilitada, tls_session_store() y tls_session_restore() copian con memcpy la dirección proporcionada por el llamador en un búfer de tamaño fijo usando el valor addrlen controlado por el llamador sin validarlo contra el tamaño de destino. struct net_sockaddr es un tipo opaco, por lo que una aplicación puede pasar un addrlen mayor que sizeof(struct net_sockaddr) (por ejemplo, 128 bytes en un búfer de pila de 24 bytes), causando que memcpy lea y escriba más allá del final de la memoria de la dirección utilizada por la caché de sesiones TLS. Esta escritura fuera de límites puede llevar a un fallo y denegación de servicio, y potencialmente a ejecución de código arbitrario."
    }
  ],
  "lastModified": "2026-07-22T20:10:00.127",
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