CVE-2025-23142 (GCVE-0-2025-23142)
Vulnerability from cvelistv5
Published
2025-05-01 12:55
Modified
2025-05-26 05:19
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: sctp: detect and prevent references to a freed transport in sendmsg sctp_sendmsg() re-uses associations and transports when possible by doing a lookup based on the socket endpoint and the message destination address, and then sctp_sendmsg_to_asoc() sets the selected transport in all the message chunks to be sent. There's a possible race condition if another thread triggers the removal of that selected transport, for instance, by explicitly unbinding an address with setsockopt(SCTP_SOCKOPT_BINDX_REM), after the chunks have been set up and before the message is sent. This can happen if the send buffer is full, during the period when the sender thread temporarily releases the socket lock in sctp_wait_for_sndbuf(). This causes the access to the transport data in sctp_outq_select_transport(), when the association outqueue is flushed, to result in a use-after-free read. This change avoids this scenario by having sctp_transport_free() signal the freeing of the transport, tagging it as "dead". In order to do this, the patch restores the "dead" bit in struct sctp_transport, which was removed in commit 47faa1e4c50e ("sctp: remove the dead field of sctp_transport"). Then, in the scenario where the sender thread has released the socket lock in sctp_wait_for_sndbuf(), the bit is checked again after re-acquiring the socket lock to detect the deletion. This is done while holding a reference to the transport to prevent it from being freed in the process. If the transport was deleted while the socket lock was relinquished, sctp_sendmsg_to_asoc() will return -EAGAIN to let userspace retry the send. The bug was found by a private syzbot instance (see the error report [1] and the C reproducer that triggers it [2]).
References
Impacted products
Vendor Product Version
Linux Linux Version: df132eff463873e14e019a07f387b4d577d6d1f9
Version: df132eff463873e14e019a07f387b4d577d6d1f9
Version: df132eff463873e14e019a07f387b4d577d6d1f9
Version: df132eff463873e14e019a07f387b4d577d6d1f9
Version: df132eff463873e14e019a07f387b4d577d6d1f9
Version: df132eff463873e14e019a07f387b4d577d6d1f9
Version: df132eff463873e14e019a07f387b4d577d6d1f9
Version: df132eff463873e14e019a07f387b4d577d6d1f9
Version: df132eff463873e14e019a07f387b4d577d6d1f9
Version: 26e51e5287eed4d96ea66a3da95429f42940f013
Version: 8b97e045bd6d37f96f161e4d371ae174148e1587
Version: e044554e97e812eb257d073bcc130e0ea653858f
Version: 8376fdc999be008f0e9918db52f1ed8c08f5a1c9
Version: cd947138e8c31e8cfcd489c12e9b97271beb6e79
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: detect and prevent references to a freed transport in sendmsg\n\nsctp_sendmsg() re-uses associations and transports when possible by\ndoing a lookup based on the socket endpoint and the message destination\naddress, and then sctp_sendmsg_to_asoc() sets the selected transport in\nall the message chunks to be sent.\n\nThere\u0027s a possible race condition if another thread triggers the removal\nof that selected transport, for instance, by explicitly unbinding an\naddress with setsockopt(SCTP_SOCKOPT_BINDX_REM), after the chunks have\nbeen set up and before the message is sent. This can happen if the send\nbuffer is full, during the period when the sender thread temporarily\nreleases the socket lock in sctp_wait_for_sndbuf().\n\nThis causes the access to the transport data in\nsctp_outq_select_transport(), when the association outqueue is flushed,\nto result in a use-after-free read.\n\nThis change avoids this scenario by having sctp_transport_free() signal\nthe freeing of the transport, tagging it as \"dead\". In order to do this,\nthe patch restores the \"dead\" bit in struct sctp_transport, which was\nremoved in\ncommit 47faa1e4c50e (\"sctp: remove the dead field of sctp_transport\").\n\nThen, in the scenario where the sender thread has released the socket\nlock in sctp_wait_for_sndbuf(), the bit is checked again after\nre-acquiring the socket lock to detect the deletion. This is done while\nholding a reference to the transport to prevent it from being freed in\nthe process.\n\nIf the transport was deleted while the socket lock was relinquished,\nsctp_sendmsg_to_asoc() will return -EAGAIN to let userspace retry the\nsend.\n\nThe bug was found by a private syzbot instance (see the error report [1]\nand the C reproducer that triggers it [2])."
        }
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        "dateUpdated": "2025-05-26T05:19:21.452Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/547762250220325d350d0917a7231480e0f4142b"
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          "url": "https://git.kernel.org/stable/c/f1a69a940de58b16e8249dff26f74c8cc59b32be"
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      ],
      "title": "sctp: detect and prevent references to a freed transport in sendmsg",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-23142",
    "datePublished": "2025-05-01T12:55:32.614Z",
    "dateReserved": "2025-01-11T14:28:41.512Z",
    "dateUpdated": "2025-05-26T05:19:21.452Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-23142\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-05-01T13:15:50.017\",\"lastModified\":\"2025-05-02T13:53:20.943\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsctp: detect and prevent references to a freed transport in sendmsg\\n\\nsctp_sendmsg() re-uses associations and transports when possible by\\ndoing a lookup based on the socket endpoint and the message destination\\naddress, and then sctp_sendmsg_to_asoc() sets the selected transport in\\nall the message chunks to be sent.\\n\\nThere\u0027s a possible race condition if another thread triggers the removal\\nof that selected transport, for instance, by explicitly unbinding an\\naddress with setsockopt(SCTP_SOCKOPT_BINDX_REM), after the chunks have\\nbeen set up and before the message is sent. This can happen if the send\\nbuffer is full, during the period when the sender thread temporarily\\nreleases the socket lock in sctp_wait_for_sndbuf().\\n\\nThis causes the access to the transport data in\\nsctp_outq_select_transport(), when the association outqueue is flushed,\\nto result in a use-after-free read.\\n\\nThis change avoids this scenario by having sctp_transport_free() signal\\nthe freeing of the transport, tagging it as \\\"dead\\\". In order to do this,\\nthe patch restores the \\\"dead\\\" bit in struct sctp_transport, which was\\nremoved in\\ncommit 47faa1e4c50e (\\\"sctp: remove the dead field of sctp_transport\\\").\\n\\nThen, in the scenario where the sender thread has released the socket\\nlock in sctp_wait_for_sndbuf(), the bit is checked again after\\nre-acquiring the socket lock to detect the deletion. This is done while\\nholding a reference to the transport to prevent it from being freed in\\nthe process.\\n\\nIf the transport was deleted while the socket lock was relinquished,\\nsctp_sendmsg_to_asoc() will return -EAGAIN to let userspace retry the\\nsend.\\n\\nThe bug was found by a private syzbot instance (see the error report [1]\\nand the C reproducer that triggers it [2]).\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: sctp: detectar y prevenir referencias a un transporte liberado en sendmsg. sctp_sendmsg() reutiliza asociaciones y transportes cuando es posible mediante una b\u00fasqueda basada en el endpoint del socket y la direcci\u00f3n de destino del mensaje. A continuaci\u00f3n, sctp_sendmsg_to_asoc() establece el transporte seleccionado en todos los fragmentos de mensaje que se enviar\u00e1n. Existe una posible condici\u00f3n de ejecuci\u00f3n si otro subproceso activa la eliminaci\u00f3n de ese transporte seleccionado, por ejemplo, desvinculando expl\u00edcitamente una direcci\u00f3n con setsockopt(SCTP_SOCKOPT_BINDX_REM), despu\u00e9s de configurar los fragmentos y antes de enviar el mensaje. Esto puede ocurrir si el b\u00fafer de env\u00edo est\u00e1 lleno, durante el periodo en que el subproceso emisor libera temporalmente el bloqueo del socket en sctp_wait_for_sndbuf(). Esto provoca que el acceso a los datos de transporte en sctp_outq_select_transport(), al vaciar la cola de salida de la asociaci\u00f3n, resulte en una lectura de use-after-free. Este cambio evita este escenario al indicar sctp_transport_free() la liberaci\u00f3n del transporte, etiquet\u00e1ndolo como \\\"muerto\\\". Para ello, el parche restaura el bit \\\"muerto\\\" en la estructura sctp_transport, que se elimin\u00f3 en el commit 47faa1e4c50e (\\\"sctp: eliminar el campo muerto de sctp_transport\\\"). Si el hilo emisor ha liberado el bloqueo del socket en sctp_wait_for_sndbuf(), el bit se vuelve a comprobar tras volver a adquirir el bloqueo para detectar la eliminaci\u00f3n. Esto se realiza manteniendo una referencia al transporte para evitar que se libere durante el proceso. Si el transporte se elimin\u00f3 mientras se liberaba el bloqueo del socket, sctp_sendmsg_to_asoc() devolver\u00e1 -EAGAIN para que el espacio de usuario pueda reintentar el env\u00edo. El error fue detectado por una instancia privada de syzbot (consulte el informe de errores [1] y el reproductor de C que lo activa [2]).\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0f7df4899299ce4662e5f95badb9dbc57cc37fa5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2e5068b7e0ae0a54f6cfd03a2f80977da657f1ee\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3257386be6a7eb8a8bfc9cbfb746df4eb4fc70e8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/547762250220325d350d0917a7231480e0f4142b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5bc83bdf5f5b8010d1ca5a4555537e62413ab4e2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7a63f4fb0efb4e69efd990cbb740a848679ec4b0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9e7c37fadb3be1fc33073fcf10aa96d166caa697\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c6fefcb71d246baaf3bacdad1af7ff50ebcfe652\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f1a69a940de58b16e8249dff26f74c8cc59b32be\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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