For this week’s Patch Tuesday, the first of the year, Microsoft addressed 97 security issues, six of them rated critical. Though six vulnerabilities have been publicly reported, I do not classify them as zero-days. Microsoft has fixed a lot of security related issues and is aware of several known issues that may have inadvertently caused significant server issues including:
- Hyper-V, which no longer starts with the message, “Virtual machine xxx could not be started because the hypervisor is not running.”
- ReFS (Resilient) file systems that are no longer accessible (which is kind of ironic).
- And Windows domain controller boot loops.
There are a variety of known issues this month, and I’m not sure whether we’ll see more issues reported with the January server patches. You can find more information on the risk of deploying these latest updates with our helpful infographic.