Microsoft has released the KB5073724 extended security update to fix the Patch Tuesday security updates, including 3 zero-days and a fix for expiring Secure Boot certificates.

Microsoft has released the KB5073724 extended security update to fix the Patch Tuesday security updates, including 3 zero-days and a fix for expiring Secure Boot certificates.

Microsoft has released the KB5073724 extended security update to fix the Patch Tuesday security updates, including 3 zero-days and a fix for expiring Secure Boot certificates.

2026年1月のWindows Update（KB5073724/KB5074109）適用後、PCが5分でフリーズする不具合が報告されています。原因は「Secure-Boot-Update」タスクの実行と推測され、特に第4〜6世代Intel搭載の古いPCで発生中。本記事ではセキュアブート無効化やタスク停止など、今すぐ試せる2つの回避策とリスクを詳しく解説します。

Microsoft has released the KB5073724 extended security update to fix the Patch Tuesday security updates, including 3 zero-days and a fix for expiring Secure Boot certificates. [...]

The first Patch Tuesday update for Windows 10 in 2026 is here under KB5073724 for those who are enrolled in the Extended Security Updates program.

Microsoft has released the KB5073724 extended security update to fix the Patch Tuesday security updates, including 3 zero-days and a fix for expiring Secure Boot certificates.

一部のWindows11やWindows10環境において、PC起動後、約5分でPCがフリーズするという不具合が発生しています。 不具合概要 日本時間で2026年1月14日以降にW...

Microsoft は、Windows 10 バージョン 22H2 および 21H2 を対象とした延長セキュリティ更新プログラム（ESU）KB5075912 をリリースしました。対象 OS ビルドは 19045.6937 および 19044.6937 です。 このパッチは重大な脆弱性に対処し、今後予定されている Secure Boot 証明書の有効期限切れに向けてシステムを準備します。 2026 年 2 月 10 日にリリースされた KB5075912 は、KB5073724、KB5077796、KB5078129 などの 1 月の更新プログラムからの以前の修正を統合しています。 Azure ホスト デバイスおよび証明書検証の信頼性向上のためのサービス スタック更新プログラム（SSU）KB5077456 が含まれています。 ユーザーは Windows Update または Microsoft Update カタログ経由でインストールし、最新の SSU が事前に存在することを確認する必要があります。 主なセキュリティ以外の修正には、中国語フォントのコンプライアンス、VSM 対応 PC での Secure Launch シャットダウンの問題、エクスプローラーのフォルダー名変更、GPU の安定性が含まれます。 また、2026 年 6 月までのブート障害を回避するため、デバイスの更新履歴に基づいて新しい Secure Boot 証明書を段階的に展開します。

Microsoft has released the KB5073724 extended security update to fix the Patch Tuesday security updates, including 3 zero-days and a fix for expiring Secure Boot certificates.

Microsoft has released the KB5073724 extended security update to fix the Patch Tuesday security updates, including 3 zero-days and a fix for expiring Secure Boot certificates.

Microsoft has released the first Windows 10 update of 2026, an important security patch called update KB5073724. This update is available for users of Windows 10 21H2, Windows 10 Enterprise LTSC 2021, and Windows 10 22H2 who have signed up for the Extended Security Updates (ESU) program. Since Windows 10 no longer receives new features—only security-related fixes—update KB5073724 doesn’t bring any new features with it. KB5073724 is purely a security update that addresses newly discovered flaws in the Windows 10 operating system. ## What’s in update KB5073724? Update KB5073724 includes security fixes that Microsoft previously pushed in December 2025 as part of KB5071546 and KB5074976: * **[Drivers]** This update removes the following modem drivers: agrsm64.sys (x64), agrsm.sys (x86), smserl64.sys (x64) and smserial.sys (x86). Modem hardware that depends on these specific drivers will no longer work in Windows 10. * **[Secure Boot]** Starting with this update, Windows quality updates include a subset of high-confidence device target data that identifies devices that can automatically receive new certificates for Secure Boot. Devices will only receive the new certificates after enough successful update signals have been verified to ensure a secure and phased rollout. * **[WinSqlite3.dll]** Fixed: The Windows core component WinSqlite3.dll has been updated. Previously, some security software may have identified this component as vulnerable. As of this writing, Microsoft doesn’t mention any issues relevant to private users that could cause problems when installing update KB5073724 on Windows 10 computers. The update might cause problems with Azure Virtual Desktop and Windows 365. ## How to install this update You can easily obtain update KB5073724 as part of the updates that Microsoft released on Patch Tuesday for January 2026. In this case, you don’t need to take any action—update KB5073724 will automatically be installed on your computer. If necessary, start a search for new updates in the Windows Update settings. Or you can also get it directly from the Microsoft Update Catalog.

Windows 10 users should install update KB5073724 immediately, which fixes several security vulnerabilities in the operating system.