CONFIG_RISCV_VECTOR_MISALIGNED is not available for thedefaultarchitecture x86.
Result is shown for architecture riscv

CONFIG_RISCV_VECTOR_MISALIGNED (not configurable)

configname: CONFIG_RISCV_VECTOR_MISALIGNED

Linux Kernel Configuration
└─>Platform type
└─>RISCV_VECTOR_MISALIGNED
In linux kernel since version 6.13 (release Date: 2025-01-19)  
Enable detecting support for vector misaligned loads and stores.