CVE-2025-38552

Estado: ModificadaAlta (7.8)—

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

mptcp: plug races between subflow fail and subflow creation

We have races similar to the one addressed by the previous patch between subflow failing and additional subflow creation. They are just harder to trigger.

The solution is similar. Use a separate flag to track the condition 'socket state prevent any additional subflow creation' protected by the fallback lock.

The socket fallback makes such flag true, and also receiving or sending an MP_FAIL option.

The field 'allow_infinite_fallback' is now always touched under the relevant lock, we can drop the ONCE annotation on write.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 7.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.32%
Percentil entre todas las CVEs puntuadas: 22
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 escalation75 %
Impacto principalT1499.004 Application or System Exploitationimpact60 %

Vulnerabilidad local (AV:L/PR:L) en kernel Linux sin interacción del usuario, permitiendo escalada de privilegios mediante race condition en MPTCP. Impacto de disponibilidad por fallo de subflow.

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

Threat Intelligence Program Filter Network Traffic Execution Prevention Application Isolation and Sandboxing Exploit Protection Update Software

Tecnologías afectadas (2)

Debian — Debian Linux Linux — Linux Kernel

CWE

NVD-CWE-noinfo

Referencias

JSON original (NVD)

Mostrar

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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: plug races between subflow fail and subflow creation\n\nWe have races similar to the one addressed by the previous patch between\nsubflow failing and additional subflow creation. They are just harder to\ntrigger.\n\nThe solution is similar. Use a separate flag to track the condition\n'socket state prevent any additional subflow creation' protected by the\nfallback lock.\n\nThe socket fallback makes such flag true, and also receiving or sending\nan MP_FAIL option.\n\nThe field 'allow_infinite_fallback' is now always touched under the\nrelevant lock, we can drop the ONCE annotation on write."
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      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mptcp: conecta las ejecuciones entre el fallo y la creación de un subflujo. Tenemos ejecuciones similares a la solucionada por el parche anterior entre el fallo de un subflujo y la creación de subflujos adicionales. Simplemente son más difíciles de activar. La solución es similar: se utiliza un indicador independiente para rastrear la condición «El estado del socket impide la creación de subflujos adicionales», protegida por el bloqueo de reserva. El bloqueo de reserva del socket hace que dicho indicador sea verdadero, y también se recibe o envía una opción MP_FAIL. El campo «allow_infinite_fallback» ahora siempre se activa bajo el bloqueo correspondiente; podemos omitir la anotación ONCE al escribir."
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