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Windows 11 KB5048667 install failures and performance or gaming complaints affected some reported Windows 11 24H2 users after the December 10, 2024 update, which produced OS Build 26100.2605. Microsoft’s original release notes did not document a broad gaming or performance regression, so verify the update, drivers, timing, and later 24H2 guidance before rolling it back.
KB5048667 generated two different kinds of concern: some users could not install the cumulative update, while others reported stuttering, low FPS, crashes, or slower Windows performance after installation. Those symptoms should not be treated as one confirmed universal defect.
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Key takeaways
- KB5048667 was released on December 10, 2024 for every edition of Windows 11 version 24H2 and brought systems to OS Build 26100.2605.
- Microsoft’s original KB5048667 release notes did not document a broad performance or gaming regression and state, “No additional issues were documented for this release.”
- Independent reporting described user complaints about installation failures, degraded general performance, stuttering, low FPS, and other gaming problems after the update.
- User reports do not establish that every Windows 11 24H2 computer was affected or that KB5048667 was always the sole cause.
- Installation failure, one-game stuttering, driver incompatibility, and system-wide slowdown require different troubleshooting paths.
- Later Windows 11 24H2 updates may have changed the status of a reported symptom, so Microsoft’s current known-issues and resolved-issues pages should be checked before uninstalling anything.
What was KB5048667?
KB5048667 was Microsoft’s December 10, 2024 cumulative security update for Windows 11 version 24H2. According to Microsoft’s KB5048667 release documentation, the update produced OS Build 26100.2605, applied to all Windows 11 24H2 editions, and included improvements from the November 21, 2024 preview update.
Microsoft distributed KB5048667 through Windows Update, Windows Update for Business, the Microsoft Update Catalog, and Windows Server Update Services. The update’s primary purpose was security servicing rather than a feature release.
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The KB article also carried forward an OpenSSH service-start issue associated with the October 2024 security update. Microsoft described that issue as affecting a limited number of enterprise, Internet of Things, and education devices and said it was addressed by KB5052093. The OpenSSH issue should not automatically be treated as the explanation for gaming or general performance complaints on a typical consumer PC.
Did KB5048667 slow down Windows 11 24H2 or reduce gaming performance?
Some Windows 11 24H2 users reported slower performance and gaming problems after KB5048667, but Microsoft’s original release notes did not document a broad performance or gaming regression.
Independent reporting from WindowsLatest described complaints involving KB5048667 installation failures, degraded performance, and gaming symptoms. Those reports explain why the update attracted attention, but they were observations from affected users rather than a controlled prevalence study.
There is no authoritative percentage in the supplied research showing how many Windows 11 24H2 devices failed to install KB5048667 or experienced low FPS, stuttering, crashes, or system-wide slowdown. The available evidence therefore supports a qualified conclusion: reported problems existed, but the evidence does not prove that KB5048667 affected every 24H2 system or that the cumulative update was the only possible cause.
What problems were officially documented versus reported by users?
| Issue or claim | Status in the evidence | How to interpret it |
|---|---|---|
| KB5048667 release date | Officially documented | December 10, 2024 |
| Resulting operating-system build | Officially documented | OS Build 26100.2605 |
| Security improvements | Officially documented | The update was a cumulative security update for Windows 11 24H2 |
| Broad gaming regression | Not documented in the original KB notes | Do not describe a universal Microsoft-confirmed gaming bug |
| Installation failures | Reported by users and independent coverage | Investigate the individual installation history and error condition |
| Performance degradation or low FPS | Reported by users and independent coverage | Compare timing, drivers, games, and later updates before assigning cause |
| OpenSSH service-start problem | Officially carried in the KB documentation | Microsoft associated it with a limited set of enterprise, IoT, and education devices and later addressed it with KB5052093 |
Microsoft’s exact statement in the KB5048667 release documentation was: “No additional issues were documented for this release.” That sentence describes Microsoft’s release-note status at the time; it does not prove that no users experienced problems afterward.
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Why does KB5048667 keep failing to install?
KB5048667 installation failure means the update process itself needs diagnosis; it does not by itself prove that the update caused later gaming or performance symptoms.
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First confirm the Windows edition and version. Open Settings, select System, select About, and check the Windows specifications. Confirm that the machine is running Windows 11 version 24H2 before applying advice specific to KB5048667.
Next review Settings > Windows Update > Update history. Look for KB5048667 and determine whether the update installed successfully, failed with an error, appears to have installed more than once, or is repeatedly being offered. Record the exact error code and whether Windows reports a pending restart.
Check Microsoft’s Windows 11 version 24H2 known-issues and notifications page before attempting a repair. Microsoft tracks some 24H2 problems by device condition, driver, edition, installation method, or workload, so a failure affecting one hardware configuration may not represent a general KB5048667 failure.
If KB5048667 was installed from a standalone .msu package, separate the package-installation problem from the operating-system symptom. A package that will not apply requires update-installation troubleshooting; a machine that installs the package but then stutters in one game requires compatibility and workload troubleshooting.
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How should you troubleshoot gaming stutters, low FPS, or crashes after KB5048667?
Start with timing and scope: document whether the symptom began immediately after KB5048667, whether a restart changes it, whether the problem affects one game or the entire system, and which graphics-driver and firmware versions are installed.
- Verify the update state. Use Windows Update history to confirm whether KB5048667 is installed and check the current OS build rather than relying on the update’s name alone.
- Check the affected workload. Record the game or application, the exact symptom, and whether other games or ordinary Windows tasks show the same slowdown.
- Review drivers and firmware. Windows 11 24H2 problems can be compatibility-specific. A graphics, chipset, storage, BIOS, or peripheral driver may coincide with the update and should remain part of the investigation.
- Check later release-health entries. Read Microsoft’s current known-issues page and the Windows 11 24H2 resolved-issues page. A later cumulative update may mitigate or resolve a symptom, but a later resolved issue should not automatically be attributed to KB5048667.
- Compare before and after conditions. Note recent game patches, graphics-driver changes, firmware updates, overlays, background software, and other Windows updates. A close timeline is evidence worth investigating, not proof of causation.
When only one game is affected, prioritize that game’s updates, graphics settings, overlays, and driver compatibility. When the entire operating system is slow or unstable, investigate Windows servicing, drivers, firmware, storage, and background processes together.
Should you uninstall KB5048667?
Uninstall KB5048667 only as a conditional troubleshooting step after confirming that the update is installed, the symptom started afterward, and current Microsoft guidance does not provide a better-supported resolution.
Before rollback, record the installed build, update history, exact symptoms, affected applications, driver versions, and any error codes. Check whether a later cumulative update has superseded KB5048667 or whether Microsoft lists a resolved issue that applies to the device. Removing a security update can reduce protection, and uninstalling an update is not a guaranteed cure if the underlying cause is a driver, game patch, firmware problem, or unrelated system fault.
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Is Windows 11 24H2 affected, or is the problem a driver issue?
Windows 11 24H2 may be involved, but the supplied evidence cannot identify every installation failure, crash, stutter, or low-FPS report as a KB5048667 defect.
The strongest case for investigating KB5048667 is a reproducible symptom that appeared immediately after the update, affects more than one application or system function, and changes when the update is removed or a later Microsoft fix is installed. The case is weaker when the symptom is limited to one game, began after a graphics-driver or firmware change, or continues unchanged after the update is removed.
Microsoft’s Windows 11 24H2 update history and current release-health documentation are more useful for present-day diagnosis than the historical December 2024 KB page alone. Current documentation can distinguish later issues by their own KB number, date, device condition, driver, edition, installation method, or affected workload.
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| Observed symptom | First checks | Risk and evidence level |
|---|---|---|
| KB5048667 repeatedly fails to install | Confirm 24H2, inspect Update history, record the error code, and check current release-health notices | Lower risk; identifies an installation problem without assuming a performance cause |
| One game stutters or shows low FPS | Check the game patch, graphics driver, overlays, firmware, and whether other games are affected | Lower risk; application-specific symptoms are not proof of a system-wide update regression |
| Windows is slow across applications | Compare timing with KB5048667, review drivers and firmware, and check later cumulative updates | Moderate diagnostic complexity; multiple causes remain possible |
| Crashes began immediately after installation | Document crash scope, update state, drivers, and later Microsoft guidance before considering rollback | Rollback is reversible in some configurations but can reduce security protection and may not cure the cause |
| Standalone .msu package will not apply | Diagnose package installation separately from any post-install performance symptom | Different failure class; do not use gaming symptoms to explain the package error |
What is the current status of the KB5048667 reports?
KB5048667 itself is a historical December 2024 update, while Windows 11 24H2 continues to receive later servicing. The original KB article should establish what Microsoft documented for that release; Microsoft’s current 24H2 release-health pages should establish whether a related symptom is currently known, resolved, mitigated, or superseded.
Do not take a later resolved-issue entry and retroactively label it a KB5048667 defect unless Microsoft explicitly connects the issue to that update. Identify the later update by its own KB number and date, and describe the affected device or workload conditions exactly as Microsoft documents them.
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Frequently Asked Questions
Why does KB5048667 keep failing to install?
KB5048667 was released for Windows 11 version 24H2 on December 10, 2024 and produced OS Build 26100.2605. Microsoft’s original release notes did not document a broad performance or gaming regression, although independent reporting described user complaints about installation failures and gaming or performance symptoms.
Did KB5048667 slow down Windows 11 24H2?
Some Windows 11 24H2 users reported slower performance, stuttering, low FPS, and other gaming problems after KB5048667. The reports do not prove that every 24H2 computer was affected or that KB5048667 was always the sole cause; drivers, firmware, game updates, and later Windows updates also require investigation.
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You should consider uninstalling KB5048667 only after confirming that the update is installed, the symptom began afterward, and current Microsoft guidance does not offer a better-supported fix. Removing a security update can reduce protection and is not guaranteed to solve a driver, firmware, game, or unrelated system problem.
Is Windows 11 24H2 affected, or is this a driver problem?
Windows 11 24H2 can be involved in an installation or performance problem, but the available evidence does not identify every failure, crash, stutter, or low-FPS report as a KB5048667 defect. Check whether the problem affects one game or the whole system, compare driver and firmware changes, and review Microsoft’s current 24H2 release-health pages.
The Bottom Line
KB5048667 was the December 10, 2024 Windows 11 24H2 security update that produced OS Build 26100.2605. Users did report installation, performance, and gaming problems, but Microsoft’s original release notes did not document a broad gaming or performance regression. Verify the update state, distinguish system-wide issues from game-specific or driver issues, check current 24H2 release-health guidance, and consider uninstalling the update only when the timing and evidence support that step.
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