FreeBSD -- SCTP SCTP_SS_VALUE kernel memory corruption and disclosure

Problem Description:
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.
Impact:
An unprivileged process can read or modify 16-bits of
memory which belongs to the kernel. This may lead to
exposure of sensitive information or allow privilege
escalation.