Microsoft has hastily deployed an emergency security patch just one week after releasing a major update addressing nearly 1,000 vulnerabilities. The September 8 Patch Tuesday release tackled a record 966 flaws, including two zero-day exploits actively being used in attacks. However, the update introduced its own problems, prompting the company to issue KB5129194 on September 14 for Windows 11 version 26H1.
The original Patch Tuesday update caused significant complications for users. Remote Desktop Services became unstable, certain USB audio devices malfunctioned, and applications relying on Hyper-V-based Linux virtual machines encountered operational failures. The follow-up patch addresses these issues while also delivering additional security improvements, though some USB Audio Class 1.0 devices may continue experiencing problems as Microsoft works toward a complete resolution.
The two zero-day vulnerabilities patched last week included flaws in the Windows Update Stack and Windows Advanced Local Procedure Call systems, both allowing attackers to gain system-level privileges. While actively exploited in the wild, Microsoft has not disclosed specific details about how these vulnerabilities were being weaponized.
Users can install the latest patch independently without first applying the previous week’s update, as the new release incorporates all September security fixes cumulatively. Windows 11 users are advised to update as soon as possible to ensure protection against these identified threats.
Originally reported by Mashable →
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