Microsoft maintains a dynamic blocklist of drivers that have been identified as having security flaws or being actively used in malware attacks. This database is updated regularly via Windows Update, ensuring the system's defenses are continuously evolving against new threats. The policy is enforced by the hypervisor-protected KMCI environment, making it extremely difficult for malware to circumvent. If a user or an administrator attempts to install a driver on this blocklist, the system will refuse to load it, directly preventing a vast array of kernel-level exploits that rely on signing legitimate but vulnerable drivers.
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