OVH reveals semi-secret plan to fix critical Januscape hypervisor bug with mass reboots – and an Australian crash-test dummy

French cloud operator OVH has revealed it used its Sydney, Australia, datacenter as the crash test dummy to test a rapid rollout of a fix for the critical Januscape guest-host escape bug in the Linux kernel-based virtual machine (KVM). Januscape, aka CVE-2026-53359, allowed attackers with root access to a guest VM to execute code as root on the host, crash that machine, or take over all other guest VMs. A widespread guest-host escape exploitation is a nightmare scenario, because many major cloud