CVE-2026-93074

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

dax/fsdev: use __va(phys) for kaddr in direct_access

Use __va(phys) instead of virt_addr + linear_offset for the kaddr

return in __fsdev_dax_direct_access(). The previous code added a

device-linear byte offset to virt_addr (which is __va of ranges[0]),

but for multi-range devices with physical gaps between ranges, this

linear arithmetic crosses the gap and produces a wrong kernel virtual

address. Using __va(phys) where phys comes from dax_pgoff_to_phys()

is correct for any range layout because the direct map translates

each physical address independently.

This leaves dev_dax->virt_addr write-only, so remove the field

(suggested by Dave Jiang).