Containers Are No Longer a Security Boundary

DepthFirst argues that traditional Linux containers should no longer be treated as a strong security isolation boundary because they share the host kernel. The research demonstrates a container escape using CVE-2026-80521, a Linux kernel use-after-free vulnerability in the AF_UNIX subsystem, and argues that AI-assisted vulnerability discovery and exploit generation are lowering the barrier to kernel exploitation. The recommended mitigation is to use stronger isolation mechanisms such as microVMs, including Firecracker or Kata Containers, especially for untrusted and multi-tenant workloads. 

https://depthfirst.com/research/containers-are-no-longer-safe

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