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Microsoft: Recent Windows updates cause SQL Server performance issues
The bug affects SQL Server linked server queries and can leave external database connections open, with Microsoft offering a temporary mitigation for administrators.
Microsoft has confirmed that Windows updates released since the October 2026 Patch Tuesday are causing SQL Server performance and stability issues. [...]
A bug in the update that Microsoft released a month ago causes problems with both performance and stability in SQL Server. Microsoft will release an extraordinary update.
Microsoft has confirmed that Windows updates since October 2026 cause slowness and instability in SQL Server due to the accumulation of open connections via OLE DB on linked servers. The company prepares an emergency correction and recommends temporary measures to reduce impacts.