KB5075941

Microsoft released cumulative update KB5075941 for Windows 11 version 23H2 (2023 Update) as part of the February Patch Tuesday for 2026. This mandatory security update is intended for Enterprise and Education editions on x64 (amd64) and ARM64 processors and combines fixes from previous releases, including the January update KB5073455 and out-of-band updates KB5077797 and KB5078132. The main goal is to improve system reliability, boot security, and graphics subsystem stability, bringing the build to 22631.6649.

• Secure Boot. Changes have been made to the bootloader for devices with the installed Windows UEFI CA 2023 certificate: the bootmgfw.efi file (signed in 2011) is replaced with a version signed in 2023. The update is deployed in stages — new Secure Boot certificates are installed only on devices that have successfully passed previous checks. When resetting the Secure Boot database or changing its state, a "Secure Boot violation" error may occur, and in rare cases, a special bootable media will be required for recovery.
• Desktop Window Manager (DWM). Fixed an issue where the Desktop Window Manager process could unexpectedly restart, leading to graphics display failures.
• File Explorer. Fixed a folder renaming bug where folders containing a desktop.ini file ignored the LocalizedResourceName parameter, preventing custom folder names from being displayed.
• Fonts and Display. Updated Chinese fonts to support the GB18030-2022A standard, expanded character coverage, and ensured their correct display.
• Graphics (dxgmms2.sys). Fixed an error that, in certain GPU configurations, caused a system crash with a KERNEL_SECURITY_CHECK_FAILURE error related to the dxgmms2.sys file.
• OS Security. Resolved a previously known issue where some PCs with Virtual Secure Mode (VSM) enabled could not properly shut down or enter sleep mode, and instead rebooted.
• Windows Security (SmartScreen). Fixed an error where Microsoft Defender SmartScreen application reputation events (AppRep) were not logged, making it difficult to investigate complex threats.

Installation via Windows Update: cumulative update KB5075941 for PCs is automatically installed via Windows Update for Enterprise and Education editions. To check for availability, open Settings > Windows Update and click Check for updates.

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