default or selected kernelversion does not have config value CONFIG_CROSS_MEMORY_ATTACH.
Result is shown for kernelversion 6.5.1

Cross Memory Support

configname: CONFIG_CROSS_MEMORY_ATTACH

Linux Kernel Configuration
└─>Cross Memory Support
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Enabling this option adds the system calls process_vm_readv and
process_vm_writev which allow a process with the correct privileges
to directly read from or write to to another process's address space.
See the man page for more details.

depends
CONFIG_MMU