Local privilege escalation via unchecked imgsensor write

Out-of-bounds write in imgsensor on affected MediaTek chipsets allows local users with System privilege to escalate privileges. The component performs a write without checking the destination boundary, allowing it to extend beyond the intended buffer; the affected function and input path are undisclosed. Exploitation is local, requires an existing System-privileged foothold, and needs no user interaction; successful use elevates privileges further.