Patch intelligence record
Windows 11 25H2 (Build 26200.7309)
Current reports mention update/install failure, unspecified windows issue, and bsod / stop error. This page covers one cumulative update, not the whole 25H2 servicing train; reports about a later update are counted on that update's own page.
Recommendations
- Pause updates if this machine is doing deadline-sensitive or production work.
- Check Microsoft's known-issue and safeguard-hold list for this KB before installing.
- Keep the uninstall path in mind: a cumulative update can be removed from Settings > Windows Update > Update history for a limited window after installation.
Current reports mention update/install failure in windows update, unspecified windows issue in Windows workflow, bsod / stop error in system stability.
- Accepted reports
- 10
- Latest evidence run
- Oct 6, 2026
- Healthy sources
- 2 fresh (success / no reports) · need 2
- Microsoft Q&A (search) Checked — no reports found last checked Oct 6, 2026
- techcommunity windows sitemap Checked — no reports found last checked Oct 6, 2026
Monitoring reflects community-evidence collection health for this exact release — an absence of reports is not a safety guarantee, and this is separate from the AUXSAYS verdict.
Vendor Known Issues — No vendor-known issue data captured for this patch.
AUXSAYS has not captured official issue data for this patch. This does not indicate the vendor has no issues. Not counted as community reports.
Official Patch Notes — vendor release notes captured from the official source
Windows 11 25H2 cumulative update, OS build 26200.7309 (KB5070311). Released 2025-12-01 on the General Availability Channel. Update type 2025-11 D. This is the official Microsoft Windows release-health entry (learn.microsoft.com/windows/release-health). Known-issue and safeguard-hold details are published on the per-version Windows release-health status page.
Windows 11 in these notes: .
Windows 11 25H2 cumulative update, OS build 26200.7309 (KB5070311). Released 2025-12-01 on the General Availability Channel. Update type 2025-11 D. This is the official Microsoft Windows release-health entry (learn.microsoft.com/windows/release-health). Known-issue and safeguard-hold details are published on the per-version Windows release-health status page.
Technical Details
- Released
- Dec 1, 2025
- File size
- Official source checked
- Sep 9, 2026
- Official notes checked
- Sep 9, 2026
Checksum
Use these hashes to verify downloaded installers match the files published with the official release.
User Reports / Sources (10)
User report sources used for the current read.
- Microsoft Learn Q&A. (2026, February 14). Right Alt+Shift not switching language both ways after KB5070311 - Microsoft Q&A. microsoft learn qna Issue: update/install failure in windows update Workflow: windows update
- Microsoft Learn Q&A. (2026, January 15). right alt triggers left ctrl in windows 11 - Microsoft Q&A. microsoft learn qna Issue: unspecified windows issue in Windows workflow Workflow: Windows workflow
- Microsoft Learn Q&A. (2025, December 20). How to fix 2025-11 Update error (KB5070311) (26200.7309) - Microsoft Q&A. microsoft learn qna Issue: update/install failure in windows update Workflow: windows update
- Microsoft Learn Q&A. (2025, December 9). Windows 11 25H2 (KB5070311) - Microsoft Q&A. microsoft learn qna Issue: update/install failure in windows update Workflow: windows update
- Microsoft Learn Q&A. (2025, December 7). Desktop Icons Left Side only do not work at startup - Microsoft Q&A. microsoft learn qna Issue: update/install failure in windows update Workflow: windows update
- Microsoft Learn Q&A. (2025, December 6). windows update error Install error - 0x800f0991 - Microsoft Q&A. microsoft learn qna Issue: update/install failure in windows update Workflow: windows update
- Microsoft Learn Q&A. (2025, December 5). 2025-11 Update error (KB5070311) (26200.7309) gives me ACPI_BIOS__ERROR (0xA5) stop code - Microsoft Q&A. microsoft learn qna Issue: bsod / stop error in system stability Workflow: system stability
- Microsoft Learn Q&A. (2025, December 3). After latest Windows 11 update (2025-11 Preview Update (KB5070311) (26200.7309)) my computer has slowed down considerably. Is there any reason / fix for this? - Microsoft Q&A. microsoft learn qna Issue: performance regression Workflow: performance
- Microsoft Learn Q&A. (2025, December 3). Why doesn't the recent Windows update install? I keep getting a failed to install message. - Microsoft Q&A. microsoft learn qna Issue: update/install failure in windows update Workflow: windows update
- Microsoft Learn Q&A. (2025, December 12). Outlook is installed but will not open Win 11 Pro. R.P. v.25H2 b. 26200.7309 - Microsoft Q&A. microsoft learn qna Issue: update/install failure in windows update Workflow: windows update
Official sources
- Microsoft. (2025, December 1). Windows 11 release information.release health
- Microsoft. (2025, December 1). Windows release health.release health
- Microsoft. Download page.download