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Windows 10 ESU Jan 2026 Update Ditches Old Modem Drivers and Refreshes Secure Boot Certs

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Source: Windows Latest
Windows 10 ESU Jan 2026 Update Ditches Old Modem Drivers and Refreshes Secure Boot Certs
Photo: Windows Latest
TL;DR Summary

The January 2026 Windows 10 ESU release KB5073724 (Build 19045.6809) arrives for ESU subscribers, removing legacy modem drivers (agrsm64.sys/agrsm.sys and smserl64.sys/smserial.sys) which may affect older modems, while adding new Secure Boot certificates and a WinSqlite3.dll security fix. Most users won’t notice changes, but some legacy modems could stop working after the update. The patch bundles security fixes (roughly 112–114 vulnerabilities, including 3 zero-days, with 57 Elevation of Privilege and other categories) and ESU updates run through October 2026. Downloads are via Settings > Windows Update or the Microsoft Update Catalog for Windows 10 Version 22H2 on x64/ARM-64 with ESU,

Topics:top-news#esu#kb5073724#modem-drivers#secure-boot#technology#windows-10
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  1. Windows 10 KB5073724 is January 2026's Extended Security Update (ESU) and it removes old modem drivers  Windows Latest
  2. Patch Tuesday, January 2026 Edition  Krebs on Security
  3. Microsoft Patch Tuesday addresses 112 defects, including one actively exploited zero-day  CyberScoop
  4. Microsoft Fixes 114 Windows Flaws in January 2026 Patch, One Actively Exploited  The Hacker News
  5. The January 2026 Security Update Review  Zero Day Initiative

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