Juha-Matti Tilli discovered that the TCP implementation in the Linux kernel performed algorithmically expensive operations in some situations when handling incoming packets. A remote attacker could use this to cause a denial of service.
4.15.0-30.324.15.0-1017.174.15.0-1019.194.15.0-1015.154.15.0-1017.174.15.0-1013.164.15.0-1018.19