CVE-2026-98635

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

scsi: block: Fix zones cond out-of-bounds write on zone report

blk revalidate disk zones() sizes the zones cond array from the disk capacity and zone size, but the index used by blk revalidate zone cond() comes from the device-driven report zones() walk and is never checked against the array size. A device reporting more zones than fit the array makes blk zone set cond() write out of bounds.

One way to reach this is a zone count exceeding 32 bits: both blk revalidate zone args.nr zones and struct zoned disk info.nr zones are unsigned int, so a disk advertising more than UINT MAX zones (e.g. 2^32 + 1024 zones of one 512-byte logical block) gets its zone count truncated to a small value, undersizing the array while the report walk keeps counting upward.

Check the index against the array size before storing the zone condition, and refuse to revalidate when the zone count does not fit 32 bits.