The first security flaw is an unbounded recursion in Linux kernel’s VLAN and TEB Generic Receive Offload (GRO) processing implementations, which could have allowed a remote attacker to crash the system through a denial of service or cause a stack corruption. It was discovered by Vladim??r Bene?? and affects Ubuntu 16.04 and 14.04. The second vulnerability is a use-after-free condition in Linux kernel’s TCP retransmit queue handling code, which could have allowed a local attacker to crash the system through a denial of service or execute malicious code. The issue was discovered by Marco Grassi and affects Ubuntu 16.04 LTS, Ubuntu 14.04 LTS, and Ubuntu 12.04 LTS.