CVE-2026-97787 | Microsoft Windows up to Server 2025 Container Isolation FS Filter Driver unionfs.sys race condition

October 14, 2026 Yanac

A vulnerability identified as very critical has been detected in Microsoft Windows up to Server 2025. This affects an unknown function of the file unionfs.sys of the component Container Isolation FS Filter Driver. Performing a manipulation results in race condition.

This vulnerability is reported as CVE-2026-97787. The attack requires a local approach. No exploit exists.

Applying a patch is the recommended action to fix this issue.VulDB Recent EntriesRead More