cloud-init through 25.1.2 includes the systemd socket unit cloud-init-hotplugd.socket with default SocketMode that grants 0666 permissions, making it world-writable. This is used for the "/run/cloud-init/hook-hotplug-cmd" FIFO. An unprivileged user could trigger hotplug-hook commands.
{ "availability": "No subscription required", "binaries": [ { "binary_name": "cloud-init", "binary_version": "25.1.4-0ubuntu0~25.04.1" }, { "binary_name": "cloud-init-base", "binary_version": "25.1.4-0ubuntu0~25.04.1" }, { "binary_name": "cloud-init-cloud-sigma", "binary_version": "25.1.4-0ubuntu0~25.04.1" }, { "binary_name": "cloud-init-smart-os", "binary_version": "25.1.4-0ubuntu0~25.04.1" } ] }