GHSA-55qj-gj3x-jq9r Denial of service in Kubernetes

• Go k8s.io/kubernetes/pkg/kubelet: >= 1.1.0, < 1.16.13 → fixed in 1.16.13 • Go k8s.io/kubernetes/pkg/kubelet: >= 1.17.0, < 1.17.9 → fixed in 1.17.9 • Go k8s.io/kubernetes/pkg/kubelet: >= 1.18.0, < 1.18.6 → fixed in 1.18.6

The Kubernetes kubelet component in versions 1.1-1.16.12, 1.17.0-1.17.8 and 1.18.0-1.18.5 do not account for disk usage by a pod which writes to its own /etc/hosts file. The /etc/hosts file mounted in a pod by kubelet is not included by the kubelet eviction manager when calculating ephemeral storage usage by a pod. If a pod writes a large amount of data to the /etc/hosts file, it could fill the storage space of the node and cause the node to fail.