Microsoft released Patch Tuesday updates for several versions of Windows Server a few days ago. While the updates were supposed to fix Lightweight Directory Access Protocol (LDAP) issues and improve security, they also appear to have triggered several other major issues. According to several reports, the latest updates cause the domain controller (DC) to boot loop and also break Hyper-V.
As noted by BornCity and Bleeping Computer, Windows Server administrators report instances of Windows restarting every few minutes after installing KB5009624, KB5009595, and KB5009557. All versions of Windows Server would be affected, with administrators observing that the boot loop is caused after the LSASS.exe process uses up all CPU resources and then terminates. Since the aforementioned process is critical to operations, it results in a reboot of the operating system. Reports claim that Windows Server restarts with error codes 0xc0000005 and 0xc0000006.
Another issue that affects Windows Server installations is that Hyper-V no longer starts after installing the latest update. As such, virtual machines also do not launch. Although the majority of reports say this only affects Windows Server 2012 R2, some have claimed that it affects newer versions as well.
Another issue is that Windows Resilient File System (ReFS) volumes are no longer accessible or show up as unformatted.
In almost all of these cases, Windows administrators reported that uninstalling the most recent and problematic Patch Tuesday updates resolved the issues. That said, it is extremely important to note that Patch Tuesday updates contain cumulative fixes, which means that uninstalling them will also leave your machines vulnerable. As such, only resort to this option if all other workarounds fail. In the meantime, we’ve reached out to Microsoft for comment on this and will update if the company responds.
Source: BornCity, beeping computer
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