Microsoft Unveils Windows 10 KB5073724 for Enhanced Security
Microsoft has released the Windows 10 KB5073724 update, focusing on enhancing security for users. This update addresses crucial vulnerabilities, including three zero-day flaws and expiring Secure Boot certificates. It is available for Windows 10 Enterprise LTSC users and those enrolled in the Extended Security Update (ESU) program.
Key Features of Windows 10 KB5073724
This update will upgrade Windows 10 to build 19045.6809 and Windows 10 Enterprise LTSC 2021 to build 19044.6809. Microsoft has shifted its focus from introducing new features to providing essential security and bug fixes.
Security Vulnerabilities Addressed
In its January 2026 Patch Tuesday release, Microsoft addressed 114 vulnerabilities, including:
- An elevation of privilege vulnerability in Agere modem drivers.
- A security flaw in the third-party WinSqlite DLL.
- Updates to resolve issues with Secure Boot certification expirations.
Driver Modifications
The KB5073724 update will remove several deprecated modem drivers:
- agrsm64.sys (x64)
- agrsm.sys (x86)
- smserl64.sys (x64)
- smserial.sys (x86)
Modem hardware relying on these drivers will be non-functional post-update.
Secure Boot Certificate Renewals
Beginning with this update, targeted device data will help identify systems that require new Secure Boot certificates. These certificates are critical for maintaining system security.
Impending Certificate Expiration
Microsoft has issued warnings regarding the expiration of specific Secure Boot certificates:
| Certificate | Expiration Date | New Certificate | Storage Location | Purpose |
|---|---|---|---|---|
| Microsoft Corporation KEK CA 2011 | June 2026 | Microsoft Corporation KEK 2K CA 2023 | Stored in KEK | Signs updates to DB and DBX |
| Microsoft Windows Production PCA 2011 | Oct 2026 | Windows UEFI CA 2023 | Stored in DB | Signs the Windows boot loader |
| Microsoft UEFI CA 2011 | June 2026 | Microsoft UEFI CA 2023 | Stored in DB | Signs third-party boot loaders and EFI applications |
| Microsoft Option ROM UEFI CA 2023 | June 2026 | — | Stored in DB | Signs third-party option ROMs |
It is vital for users to apply this update to avoid vulnerabilities. If Secure Boot certificates expire without renewal, system protections could be compromised.
Conclusion
Microsoft confirms that there are no known issues with the KB5073724 update. It is essential for users to regularly check for updates to maintain system security and efficiency.
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