Microsoft: Windows Server 2025 changes causing app crashes
Recorded: Sept. 8, 2026, noon
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Microsoft issued a warning to customers regarding potential application crashes on certain Windows Server 2025 installations stemming from recent memory management changes. This known issue specifically affects applications that utilize Address Windowing Extensions (AWE), a capability that allows an application to access more than four gigabytes of physical memory within a three twenty-bit virtual address space. The problem arises because the Windows Server 2025 memory management alteration interferes with specific memory behaviors leveraged by certain applications that depend on the memory management characteristics present in previous Windows Server releases while employing AWE. The consequences of this instability are severe, including potential access violations and memory corruption for affected applications. Users encountering this issue may observe error codes such as 0xC0000005 access violation exceptions, memory corruption errors, and failures during critical database maintenance operations like DBCC CHECKDB. For systems running SQL Server with the Lock Pages in Memory (LPIM) Windows policy enabled to enhance performance, impacted systems exhibit SQL Server crash dumps and unexpected stopping or restarting of SQL Server services. Furthermore, affected users are alerted via error logs during system startup with messages indicating "Using locked pages in the memory manager." The scenario is particularly relevant for applications that rely on specific memory behaviors from earlier operating systems when running under Windows Server 2025. While a permanent resolution is pending, Microsoft provided a temporary workaround. This involves administrators disabling the LPIM policy specifically for the SQL Server service account. However, Microsoft cautioned that this workaround must be evaluated in context, as disabling LPIM could negatively influence SQL Server performance and overall memory management behavior. For other applications experiencing similar issues, users are advised to investigate whether AWE can be disabled. In addition to the memory management concerns, Microsoft has deployed emergency security updates addressing other known issues on Windows Server 2025. In April, updates were released to resolve a problem where the KB5082063 security update failed to install correctly on some systems. More recently, in June, a bug was fixed that prevented some Windows Server 2025 devices from booting into BitLocker recovery mode after successfully installing the April 2026 security update. Overall security posture concerning credentials is also noted, as analysis from the Blue Report 2026 indicates that once attackers possess valid credentials, the effectiveness of prevention measures drops significantly, as only thirty-seven percent of actions are blocked, highlighting that defenses must account for post-initial access activities. |