Basically you would expect to only find the sections that are defined in the linker.ld script to actually be in the Kernel ELF file, however by default the ld linker will just create a new section to place a symbol that is not mentioned in the linker script. This can cause some footguns.

See binutils ld - Orphan Sections.

Orphan sections are sections present in the input files which are not explicitly placed into the output file by the linker script. The linker will still copy these sections into the output file by either finding, or creating a suitable output section in which to place the orphaned input section.