Three times in a decade. That's how often a Linux copy-primitive bug has blown a hole through container isolation. In 2016 it was Dirty COW. In 2024 it was Leaky Vessels. In 2026, a new class of Linux copy-primitive bugs is proving, again, that containers share a kernel. And that kernel keeps betraying them.

The pattern is hard to ignore. Bugs in how the Linux kernel copies, references, or manages data at the lowest level keep punching through container isolation boundaries. If you're running Docker or Podman in production, rootless or not, this should be on your radar. The next copy-primitive container escape isn't a question of if . It's when .

Why Linux Copy-Primitive Bugs Keep Breaking Containers

Containers aren't virtual machines. They don't have their own kernel.…