CVE-2025-22044 is a medium-severity vulnerability in the Linux kernel's ACPI NFIT driver. It involves a narrowing conversion issue in the acpi_nfit_ctl function where a 64-bit user input value is improperly converted to a 32-bit integer before validation. This can cause invalid arguments to be passed, potentially leading to undefined behavior and denial of service. The vulnerability was reported by Syzkaller and fixed by ensuring proper validation of the original 64-bit input value.