CVE-2023-52576

In the Linux kernel, the following vulnerability has been resolved: x86/mm,
kexec, ima: Use memblock_free_late() from ima_free_kexec_buffer() The code
calling ima_free_kexec_buffer() runs long after the memblock allocator has
already been torn down, potentially resulting in a use after free in
memblock_isolate_range(). With KASAN or KFENCE, this use after free will
result in a BUG from the idle task, and a subsequent kernel panic. Switch
ima_free_kexec_buffer() over to memblock_free_late() to avoid that bug.