WSL mirror network mode is broken in the latest stable windows update

[offsechq]

Windows Version

Microsoft Windows [Version 10.0.26200.7623]

WSL Version

WSL version: 2.6.3.0

Are you using WSL 1 or WSL 2?

• WSL 2
• WSL 1

Kernel Version

Kernel version: 6.6.87.2-1

Distro Version

Kali GNU/Linux Rolling 2025.4

Other Software

No response

Repro Steps

Running WSL with network mode set to mirror results in fail.

Expected Behavior

Working with no issue.

Actual Behavior

wsl: Mirrored networking mode is not supported: Windows version 26200.7623 does not have the required features.
Falling back to NAT networking.

Diagnostic Logs

WslNetworkingLogs-2026-01-18_12-34-22.zip

[github-actions]

The log file doesn't contain any WSL traces. Please make sure that you reproduced the issue while the log collection was running.

Diagnostic information

.wslconfig found
Detected appx version: 2.6.3.0
optional-components.txt not found
Found no WSL traces in the logs

[github-actions]

The log file doesn't contain any WSL traces. Please make sure that you reproduced the issue while the log collection was running.

Diagnostic information

.wslconfig found
Detected appx version: 2.6.3.0
optional-components.txt not found
Found no WSL traces in the logs

[offsechq]

The issue produced on the launch of WSL itself

[ebtechie234]

I also have this issue, when I set networking to NAT Ubuntu LTS boots up faster, and gains networking, setting networking to Mirrored, doing wsl --shutdown, starting Ubuntu back up again causes slow ubuntu wsl2 startup and networking no longer works.