default or selected kernelversion does not have config value CONFIG_NET_SCH_CBQ.
Result is shown for kernelversion 6.7.6

Class Based Queueing (CBQ)

modulename: sch_cbq.ko

configname: CONFIG_NET_SCH_CBQ

Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>QoS and/or fair queueing
└─>Class Based Queueing (CBQ)
In linux kernel since version 2.6.12  
Say Y here if you want to use the Class-Based Queueing (CBQ) packet
scheduling algorithm. This algorithm classifies the waiting packets
into a tree-like hierarchy of classes; the leaves of this tree are
in turn scheduled by separate algorithms.

See the top of <file:net/sched/sch_cbq.c> for more details.

CBQ is a commonly used scheduler, so if you're unsure, you should
say Y here. Then say Y to all the queueing algorithms below that you
want to use as leaf disciplines.

To compile this code as a module, choose M here: the
module will be called sch_cbq.

source code: