This indicates an attack attempt against an Integer Underflow vulnerability in Linux Kernel SCTP Protocol.
The vulnerability is caused by an error when the vulnerable software handles crafted SCTP packets. A remote attacker can exploit this to cause denial of service conditions on the affected server.
Linux Kernel Project Kernel prior to mainline v3.16-rc1
Denial of Service: Remote attacker can crash vulnerable systems.
Apply the most recent upgrade or patch from the vendor.