FreeBSD Security Advisory – SCTP protocol provides reliable, flow-controlled, two-way transmission of data. It is a message oriented protocol and can support the SOCK_STREAM and SOCK_SEQPACKET abstractions. SCTP allows the user to choose between multiple scheduling algorithms to optimize the sending behavior of SCTP in scenarios with different requirements. Due to insufficient validation of the SCTP stream ID, which serves as an array index, a local unprivileged attacker can read or write 16-bits of kernel memory.