CVE-2026-19575 Type confusion in the device_deinit system call allows user-mode threads to execute arbitrary kernel code

The user-mode verification handler for the devicedeinit system call, zvrfydevicedeinit in kernel/device.c, validated its dev argument with KSYSCALLOBJINITdev, KOBJANY. kobjectvalidate short-circuits its type comparison when the requested type is KOBJANY, so the check reduced to "this pointer is t...