CVE-2026-52992

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

fs/adfs: validate nzones in adfsvalidatebblk()

Reject ADFS disc records with a zero zone count during boot block validation, before the disc record is used.

When nzones is 0, adfsreadmap() passes it to kmallocarray(0, ...) which returns ZEROSIZEPTR, and adfsmap_layout() then writes to dm[-1], causing an out-of-bounds write before the allocated buffer.

adfsvalidatedr0() already rejects nzones != 1 for old-format images. Add the equivalent check to adfsvalidatebblk() for new-format images so that a crafted image with nzones == 0 is rejected at probe time.

Found by syzkaller.