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Versions Affected : All verisons prior to FreeNAS 11.3-U5


The Stream Control Transmission Protocol (SCTP) is a message oriented transport protocol supporting arbitrary large user messages. It can be accessed from applications by using the the socket API.

Due to improper handling in the kernel, a use-after-free bug can be triggered by sending large user messages from multiple threads on the same socket.


No workaround is available.


  • Upgrade to FreeNAS 11.3-U5 or later.


Further information