default or selected kernelversion does not have config value CONFIG_BLK_DEV_UB.
Result is shown for kernelversion 6.2.5

Low Performance USB Block driver

modulename: ub.ko

configname: CONFIG_BLK_DEV_UB

Linux Kernel Configuration
└─>Device Drivers
└─>Block devices
└─>Low Performance USB Block driver
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
This driver supports certain USB attached storage devices
such as flash keys.

If you enable this driver, it is recommended to avoid conflicts
with usb-storage by enabling USB_LIBUSUAL.

If unsure, say N.

source code: