The kernel datapath is the in-kernel forwarding path used by networking systems to process packets quickly and handle related control messages. In Open vSwitch, this path sits inside the Linux kernel and can move traffic between virtual machines, containers, and host interfaces with much lower overhead than userspace processing.
It matters in cyber security because code in the kernel has high privilege and a small memory-safety bug can become a host compromise. If attackers can reach the datapath through crafted Netlink attributes, malformed flow rules, or namespace-scoped privileges, they may trigger corruption, leaks, or control-flow abuse. Defenders should treat datapath bugs as serious local attack surfaces: patch the kernel, restrict module loading, and reduce exposure when the feature is not needed.