FreeBSD: VID-4edaa9f4-6b51-11ef-9a62-002590c1f29c (CVE-2024-32668): FreeBSD -- bhyve(8) privileged guest escape via USB controller

Problem Description: bhyve can be configured to emulate devices on a virtual USB controller (XHCI), such as USB tablet devices. An insufficient boundary validation in the USB code could lead to an out-of-bounds write on the heap, with data controlled by the caller. Impact: A malicious, privileged software running in a guest VM can exploit the vulnerability to achieve code execution on the host in the bhyve userspace process, which typically runs as root. Note that bhyve runs in a Capsicum sandbox, so malicious code is constrained by the capabilities available to the bhyve process.