Microsoft has confirmed two separate Windows 11 bugs that have been affecting some users, including a serious system crash issue and a connectivity problem tied to a recent optional update.
The more critical bug could trigger a so-called Black Screen of Death accompanied by the error code KERNEL_SECURITY_CHECK_FAILURE. Microsoft linked the crashes to certain graphics card configurations and a fault in the system file dxgmms2.sys, which handles DirectX graphics memory management. Systems impacted by the bug could unexpectedly crash and display the black error screen during normal use.
At the same time, a second issue connected to the optional January update KB5074105 caused Wi-Fi problems for some users. Affected PCs were unable to connect to networks using the WPA3-Personal security protocol, leaving devices stuck offline unless users switched networks or security modes.
Microsoft says both problems have now been addressed. Fixes were included in Windows 11 Build 26200.7840 (KB5077181) and later versions, which began rolling out earlier this month. The updates are being distributed gradually, meaning some users may still need to check Windows Update manually to receive them.
The company has not specified exactly how many systems were affected, but the confirmation comes after multiple user reports surfaced across forums and support channels. Users experiencing crashes or WPA3 connection issues are advised to install the latest available Windows 11 updates to ensure the fixes are applied.
