In the VirtualBox Oracle VM VirtualBox Extension Pack section of the wiki it states twice that the extension pack adds support for USB 2.0 and USB 3.0 devices but this is now included in the base package since VirtualBox 7.0.0.
Devices: The EHCI and XHCI USB controller devices are now part of the open source base package
VirtualBox Manual - 1.5. Installing Oracle VM VirtualBox and Extension Packs:
Extension packs. Additional extension packs can be downloaded which extend the functionality of the Oracle VM VirtualBox base package. Currently, Oracle provides a single extension pack, available from: http://www.virtualbox.org. The extension pack provides the following added functionality:
VirtualBox Remote Desktop Protocol (VRDP) support. See Section 7.1, “Remote Display (VRDP Support)”.
Host webcam passthrough. See Section 9.5, “Webcam Passthrough”.
Intel PXE boot ROM.
Disk image encryption with AES algorithm. See Section 9.29, “Encryption of Disk Images”.
Cloud integration features. See Section 1.16, “Integrating with Oracle Cloud Infrastructure”.