In the Linux kernel, the following vulnerability has been resolved:

mm: vmalloc: check if a hash-index is in cpu_possible_mask

The problem is that there are systems where cpu_possible_mask has gaps
between set CPUs, for example SPARC.  In this scenario addr_to_vb_xa()
hash function can return an index which accesses to not-possible and not
setup CPU area using per_cpu() macro.  This results in an oops on SPARC.

A per-cpu vmap_block_queue is also used as hash table, incorrectly
assuming the cpu_possible_mask has no gaps.  Fix it by adjusting an index
to a next possible CPU.

kernel.org https://git.kernel.org/stable/c/28acd531c9a365dac01b32e6bc54aed8c1429bcb [No types assigned]

kernel.org https://git.kernel.org/stable/c/47f9b6e49b422392fb0e348a65eb925103ba1882 [No types assigned]

kernel.org https://git.kernel.org/stable/c/a34acf30b19bc4ee3ba2f1082756ea2604c19138 [No types assigned]