Microsoft’s February 2026 cumulative update for Windows 11 (KB5077181) was supposed to patch a batch of security vulnerabilities — but some users are reporting serious issues after installing it.

The biggest problem?

Devices stuck in infinite reboot loops after the update installs.

Affected systems (mainly 24H2 and 25H2 builds) reportedly restart repeatedly, sometimes never reaching the login screen. Others are seeing login failures, broken networking, or update installation errors.

As of now, Microsoft hasn’t officially added this to their known issues list, but community reports are growing.

What KB5077181 Was Supposed to Fix

This update included patches for multiple security vulnerabilities, including some serious ones:

Some of these were being actively exploited in the wild — which makes this update important from a security standpoint.

But ironically, for some users, installing it created stability issues.

What Users Are Experiencing

Reports include:

• Reboot loops immediately after update
• Login screen not loading
• Network/DHCP issues
• Update installation failures

In most cases, affected users are booting into Recovery Mode and uninstalling the update to restore normal functionality.

Should You Install It?

That depends.

If you're running a stable production system and don’t urgently need the patch, you may want to:

• Wait for Microsoft to acknowledge the issue
• Monitor community feedback
• Test in a VM or secondary machine first

However, note that at least one vulnerability in this batch was actively exploited — so delaying updates always carries risk.

Bottom Line

This is another example of the constant trade-off in cybersecurity:

Patch fast → risk instability
Delay patching → risk exploitation

For now, keep an eye on official Microsoft advisories and community reports before pushing KB5077181 across critical systems.

Read the full article: https://luckyy.uk/windows-11-kb5077181-update-causing-boot-loops-heres-whats-happening/