The sctp_assoc_update function in net/sctp/associola.c in the Linux
kernel through 3.15.8, when SCTP authentication is enabled, allows
remote attackers to cause a denial of service (NULL pointer
dereference and OOPS) by starting to establish an association between
two endpoints immediately after an exchange of INIT and INIT ACK
chunks to establish an earlier association between these endpoints in
the opposite direction.
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