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CVE-2022-49669

Estado: AnalizadaAlta (7.8)—

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

mptcp: fix race on unaccepted mptcp sockets

When the listener socket owning the relevant request is closed, it frees the unaccepted subflows and that causes later deletion of the paired MPTCP sockets.

The mptcp socket's worker can run in the time interval between such delete operations. When that happens, any access to msk->first will cause an UaF access, as the subflow cleanup did not cleared such field in the mptcp socket.

Address the issue explicitly traversing the listener socket accept queue at close time and performing the needed cleanup on the pending msk.

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Note that the locking is a bit tricky, as we need to acquire the msk socket lock, while still owning the subflow socket one.

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.

Vulnerabilidad local (AV:L, PR:L) que permite escalada de privilegios mediante race condition (CWE-416) en kernel Linux; acceso no privilegiado puede ejecutar código con privilegios elevados.

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 InstallationBehavior Prevention on Endpoint

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: fix race on unaccepted mptcp sockets\n\nWhen the listener socket owning the relevant request is closed,\nit frees the unaccepted subflows and that causes later deletion\nof the paired MPTCP sockets.\n\nThe mptcp socket's worker can run in the time interval between such delete\noperations. When that happens, any access to msk->first will cause an UaF\naccess, as the subflow cleanup did not cleared such field in the mptcp\nsocket.\n\nAddress the issue explicitly traversing the listener socket accept\nqueue at close time and performing the needed cleanup on the pending\nmsk.\n\nNote that the locking is a bit tricky, as we need to acquire the msk\nsocket lock, while still owning the subflow socket one."
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