KB5078734: improves stability affecting certain GPU configurations

March 10, 2026—KB5078734 (OS Build 25398.2207)

Improvements
This security update contains fixes and quality improvements from KB5075897 (released February 10, 2026). The following summary outlines key issues addressed by this update. Also, included are available new features. The bold text within the brackets indicates the item or area of the change.

• [Secure Boot] With this update, Windows quality updates include additional high confidence device targeting data, increasing coverage of devices eligible to automatically receive new Secure Boot certificates. Devices receive the new certificates only after demonstrating sufficient successful update signals, maintaining a controlled and phased rollout.
• [Graphics]​​​​​​​
  Improved: This update improves stability for certain GPU configurations. It helps games and 3D apps run more reliably during intensive graphics use
  Improved: This update improves stability affecting certain GPU configurations, helping devices shut down more reliably.
• [Texts and Fonts] Improved: This update improves Windows fonts by adding the new Saudi Riyal currency symbol. This change helps keep text clear, accurate, and visually consistent across your Windows apps and experiences.
• ​​​​​​[Windows System Image Manager​​​​​​​] Improved: This update improves the reliability of choosing trusted catalog files. It adds a warning dialog that helps you confirm that the file you select comes from a trusted source.