The Linux kernel versions 4.9+ and supported versions of FreeBSD are vulnerable to denial of service conditions with low rates of specially modified packets.
Linux kernel versions 4.9+ can be forced to make very expensive calls to tcp_collapse_ofo_queue() and tcp_prune_ofo_queue() for every incoming packet which can lead to a denial of service.
An remote attacker may be able to trigger a denial-of-service condition against a system with an available open port.
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Thanks to Juha-Matti Tilli(Aalto University,Department of Communications and Networking/Nokia Bell Labs)for reporting these vulnerabilities.