Windows releases

The latest KB for each servicing branch, from Microsoft's public release-information tables. Dates are availability dates, not evidence of what your devices installed.

Windows servicing cycle

Release matrix

Next Patch Tuesday

Tue 13 Octin 16 days

BSecurity OOBOut-of-band DPreview

8 Sep B14 Sep OOB22 Sep DTODAY 13 Oct B

12 Bsecurity KBs · 8 Sep 12 OOBout-of-band · 14 Sep 3 Dpreviews · 22 Sep

Everything from Patch Tuesday week · 8 Sep–14 Sep

Latest release per branch

6 branches · 2 dormant CSV Text

Servicing branch	Latest release	Last security (B) release	CVEs fixed by B	Known issues	Status
Windows 11
Windows 11, version 26H1	KB5124006 D build 28000.3086 · 22 Sep 2026	KB5124012 8 Sep 2026	62753 critical1 exploited	3 open	Active
Windows 11, version 25H2	KB5124010 D build 26200.9550 · 22 Sep 2026	KB5124008 8 Sep 2026	62753 critical1 exploited	3 open	Active
Windows 11, version 24H2	KB5124010 D build 26100.9550 · 22 Sep 2026	KB5124008 8 Sep 2026	62853 critical1 exploited	3 open	Active
Windows 11, version 23H2Enterprise and Education	KB5129242 OOB build 22631.7584 · 14 Sep 2026	KB5122880 8 Sep 2026	60252 critical1 exploited	1 open	Active
Windows 11, version 22H2	KB5066793 B build 22621.6060 · 14 Oct 2025	Same as latest	—	—	Dormant · 11 mo
Windows 11, version 21H2	KB5044280 B build 22000.3260 · 8 Oct 2024	Same as latest	—	—	Dormant · 23 mo

Open known issues

3 open · Windows release health

Mitigatedfrom KB5120996Win 11 26H1, Win 11 25H2, Win 11 24H2updated 24 Sep

Devices might experience a black screen or desktop loading issues after sign-inMicrosoft has received reports of this issue occurring in some virtual desktop environments.
Mitigatedfrom KB5124012Win 11 26H1, Win 11 25H2, Win 11 24H2updated 16 Sep

Domain-joined devices might lose their secure trust relationship with the domainSome Credential Guard protected machine accounts might be unable to sign in interactively will valid domain credentials.
Mitigatedfrom KB5124012Win 11 26H1, Win 11 25H2, Win 11 24H2 +1updated 14 Sep

USB audio devices might fail to start or produce no soundSome USB Audio Class 1.0 devices display Code 10 or fail in multichannel audio modes after installing KB5124008.

Recently resolved

last 60 days

ResolvedWin 11 26H1, Win 11 25H2, Win 11 24H2 +1updated 17 Sep

Incorrect notifications that "Microsoft Defender Antivirus is turned off"Microsoft Defender Antivirus remains active and functioning correctly despite notifications following the latest update.
Resolvedfrom KB5124012 fixed by KB5129194Win 11 26H1, Win 11 25H2, Win 11 24H2 +1updated 17 Sep

Remote Desktop Services might stop responding after Sept. 2026 security updateSome Windows devices with Remote Desktop enabled might experience Remote Desktop Services (RDS) instability.
Resolvedfrom KB5124012 fixed by KB5129194Win 11 26H1, Win 11 25H2, Win 11 24H2 +1updated 14 Sep

Host folder shares might be unavailable in Hyper-V-based Linux VMsPlan9 host folder shares might not appear in the guest environment after installing the September 2026 security update.
Resolvedfrom KB5120998 fixed by KB5124008Win 11 25H2, Win 11 24H2updated 8 Sep

Mouse customization is reset on non-English Windows devicesCustom cursors and cursor animations may intermittently revert

Show 3 more

Resolvedfrom KB5120998 fixed by KB5124008Win 11 25H2, Win 11 24H2updated 8 Sep

Desktop background settings are lost or reset on some devicesFor affected Windows installations, backgrounds might revert to a black solid color
Resolvedfrom KB5121000 fixed by KB5124012Win 11 26H1, Win 11 25H2, Win 11 24H2updated 8 Sep

Microsoft Teams and Outlook might fail to launch on ARM-based devicesThis most likely occurs on new PCs after installing the August Windows security update and does not affect other apps.
Resolvedfrom KB5121003Win 11 25H2, Win 11 24H2updated 26 Aug

Some games become unresponsive when certain drivers are presentThis issue is related to peripherals with RGB features

KB releases · last 30 days

Search in stream

Tue 22 Sep3 items

Windows 11, version 24H2

KB5124010 D build 26100.9550 Support

5d ago

Windows 11, version 25H2

KB5124010 D build 26200.9550 Support

5d ago

Windows 11, version 26H1

KB5124006 D build 28000.3086 Support

5d ago

Mon 14 Sep4 items

Windows 11, version 23H2

KB5129242 OOB build 22631.7584 Support

13d ago

Windows 11, version 24H2

KB5129195 OOB build 26100.9457 Support

13d ago

Windows 11, version 25H2

KB5129195 OOB build 26200.9457 Support

13d ago

Windows 11, version 26H1

KB5129194 OOB build 28000.2956 Support

13d ago

Tue 8 Sep4 items

Windows 11, version 23H2

KB5122880 B build 22631.7582 Support

19d ago

Windows 11, version 24H2

KB5124008 B build 26100.9445 Support

19d ago

Windows 11, version 25H2

KB5124008 B build 26200.9445 Support

19d ago

Windows 11, version 26H1

KB5124012 B build 28000.2954 Support

19d ago