Windows 11, version 24H2 の既知の不具合

配布元の一覧ページ　この版のページ　最終チェック 2026-10-26 21:45 JST

不具合（11 件。未解決 2 件）

状態	不具合	更新日
解決	Applications which require AC-3 audio decoding might close unexpectedly This issue is more likely to occur in legacy applications, and unlikely for many modern applications. きっかけ: OS Build 26100.9550 KB5124010 2026-09-22 解決日: 2026-10-13（配布元の記載）経過: Confirmed → Resolved（10-14）内容更新: 2026-10-13 詳細 Resolution KB5127648 Affected platforms Client: Windows 11, version 26H2; Windows 11, version 25H2; Windows 11, version 24H2 Server: None	2026-10-13
解決	Devices might experience a black screen or desktop loading issues after sign-in Microsoft has received reports of this issue occurring in some virtual desktop environments. きっかけ: OS Build 26100.9278 KB5120998 2026-08-27 解決日: 2026-10-13（配布元の記載）経過: Mitigated → Resolved（10-14）内容更新: 2026-10-13 詳細 Resolution KB5127648 Affected platforms Client: Windows 11, version 26H2; Windows 11, version 26H1; Windows 11, version 25H2; Windows 11, version 24H2 Server: None Back to top Remote Desktop connections might fail for non-admin users with error 0xC000000D Status Originating update History Mitigated OS Build 26100.9550 KB5124010 2026-09-22 Last updated: 2026-10-13, 10:13 PT Opened: 2026-10-13, 09:43 PT After installing the September 2026 non-security preview update ( KB5124010 ), or later updates, non-admin users might be unable to establish Remote Desktop connections to remote devices that have Administrator protection enabled. Attempts to connect might fail with error 0xC000000D and display the message, “The token that was passed to the function is invalid.” This issue primarily affects enterprise-managed remote devices used as Remote Desktop hosts with Administrator protection enabled, regardless of how the feature was enabled . Note : If your organization uses Windows security baselines , published through the Microsoft Security Compliance Toolkit, Administrator protection is enabled by default in Windows 11, version 24H2, 25H2, and 26H2 security baselines, unless your organization has configured the policy differently. Workaround: IT administrators can mitigate this issue on devices affected by the Remote Desktop connection failure by using their existing policy management method to temporarily turn off Administrator protection. Reset the User Account Control Type Of Admin Approval Mode policy in Microsoft Intu…	2026-10-13
回避策あり	Remote Desktop connections might fail for non-admin users with error 0xC000000D This issue affects non-admin users connecting through Remote Desktop with Administrator protection enabled. きっかけ: OS Build 26100.9550 KB5124010 2026-09-22 詳細 Affected platforms Client: Windows 11, version 26H2; Windows 11, version 26H1; Windows 11, version 25H2; Windows 11, version 24H2 Server: None	2026-10-13
解決	Domain-joined devices might lose their secure trust relationship with the domain Some Credential Guard protected machine accounts might be unable to sign in interactively will valid domain credentials. きっかけ: OS Build 26100.9445 KB5124008 2026-09-08 解決日: 2026-09-22（配布元の記載）経過: Mitigated → Resolved（10-09）内容更新: 2026-10-08 詳細 Resolution KB5124010 Affected platforms Client: Windows 11, version 26H2; Windows 11, version 26H1; Windows 11, version 25H2; Windows 11, version 24H2 Server: None	2026-10-08
解決	Incorrect notifications that "Microsoft Defender Antivirus is turned off" Microsoft Defender Antivirus remains active and functioning correctly despite notifications following the latest update. 解決日: 2026-09-30（配布元の記載）詳細 Affected platforms Client: Windows 11, version 26H1; Windows 11, version 25H2; Windows 11, version 24H2; Windows 11, version 23H2; Windows 10, version 22H2; Windows 10, version 21H2; Windows 10 Enterprise LTSC 2019; Windows 10 Enterprise LTSC 2016 Server: Windows Server 2025; Windows Server 2022; Windows Server 2019; Windows Server 2016; Windows Server 2012 R2; Windows Server 2012	2026-09-30
回避策あり	USB audio devices might fail to start or produce no sound Some USB Audio Class 1.0 devices display Code 10 or fail in multichannel audio modes after installing the Sept. 8 update きっかけ: OS Build 26100.9445 KB5124008 2026-09-08 詳細 Affected platforms Client: Windows 11, version 26H2; Windows 11, version 26H1; Windows 11, version 25H2; Windows 11, version 24H2; Windows 11, version 23H2; Windows 10, version 22H2; Windows 10, version 21H2; Windows 10 Enterprise LTSC 2019; Windows 10 Enterprise LTSC 2016 Server: Windows Server 2025; Windows Server 2022; Windows Server 2019; Windows Server 2016; Windows Server 2012 R2; Windows Server 2012	2026-09-29
解決掲載終了	Remote Desktop Services might stop responding after Sept. 2026 security update Some Windows devices with Remote Desktop enabled might experience Remote Desktop Services (RDS) instability. きっかけ: OS Build 26100.9445 KB5124008 2026-09-08 解決日: 2026-09-14（配布元の記載）詳細 Resolution KB5129195 Affected platforms Client: Windows 11, version 26H1; Windows 11, version 25H2; Windows 11, version 24H2; Windows 11, version 23H2; Windows 10, version 22H2; Windows 10, version 21H2; Windows 10 Enterprise LTSC 2019; Windows 10 Enterprise LTSC 2016 Server: Windows Server 2025; Windows Server 2022; Windows Server 2019; Windows Server 2016; Windows Server 2012 R2; Windows Server 2012	2026-09-17
解決掲載終了	Host folder shares might be unavailable in Hyper-V-based Linux VMs Plan9 host folder shares might not appear in the guest environment after installing the September 2026 security update. きっかけ: OS Build 26100.9445 KB5124008 2026-09-08 解決日: 2026-09-14（配布元の記載）詳細 Resolution KB5129195 Affected platforms Client: Windows 11, version 26H1; Windows 11, version 25H2; Windows 11, version 24H2; Windows 11, version 23H2; Windows 10, version 22H2; Windows 10, version 21H2 Server: None Click here to manage email notifications for Windows known issues.	2026-09-14
解決掲載終了	Mouse customization is reset on non-English Windows devices Custom cursors and cursor animations may intermittently revert きっかけ: OS Build 26100.9278 KB5120998 2026-08-27 解決日: 2026-09-08（配布元の記載）詳細 Resolution KB5124008 Affected platforms Client: Windows 11, version 25H2; Windows 11, version 24H2 Server: None	2026-09-08
解決掲載終了	Desktop background settings are lost or reset on some devices For affected Windows installations, backgrounds might revert to a black solid color きっかけ: OS Build 26100.9278 KB5120998 2026-08-27 解決日: 2026-09-08（配布元の記載）詳細 Resolution KB5124008 Affected platforms Client: Windows 11, version 25H2; Windows 11, version 24H2 Server: None	2026-09-08
解決掲載終了	Microsoft Teams and Outlook might fail to launch on ARM-based devices This most likely occurs on new PCs after installing the August Windows security update and does not affect other apps. きっかけ: OS Build 26100.9168 KB5121003 2026-08-11 解決日: 2026-09-08（配布元の記載）詳細 Resolution KB5124008 Affected platforms Client: Windows 11, version 26H1; Windows 11, version 25H2; Windows 11, version 24H2 Server: None	2026-09-08

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