CVE-2025-21391, the zero-day Windows storage flaw, stems from the way Windows resolves file paths and follows links, Walters said. File deletion is just the beginning of the problems it could cause, as it could lead to privilege escalation, unwanted access to security logs or configurations, malware injection, data manipulation, or other attacks.

The latest updates resolve more glitches and security flaws - some critical - in Windows 11 23H2 and 24H2, so you'll want to install them sooner rather than later.

Windows 11 update packs a raft of important fixes for nasty audio bugs and an Auto HDR glitch that has been seriously frustrating for gamers.