Microsoft has issued emergency fixes for several issues caused by its massive Patch Tuesday update, which addressed a record 974 unique Common Vulnerabilities and Exposures (CVEs) last week. The out-of-band updates aim to resolve problems with Remote Desktop Services (RDS), Hyper-V virtual machines, and USB audio devices.
The September Patch Tuesday update was the largest in history, eclipsing the previous record of 909 CVEs patched in all of 2023. While AI has undoubtedly supercharged vulnerability reporting, leading to an alarming number of CVEs being discovered, experts warn that this may also indicate a rise in faulty patches as patch volumes continue to grow.
Ensar Seker, Chief Information Security Officer at SOCRadar, notes that the complexity of modern technology landscapes is a significant contributor to these issues. With increasingly interconnected operating systems, cloud services, virtualization platforms, drivers, identity components, and legacy technologies, it becomes extremely difficult for vendors like Microsoft to reproduce every enterprise environment before releasing patches.
As a result, some organizations may experience problems after installing the Patch Tuesday update, such as RDS becoming unstable, leading to failed RDP connections or sign-in issues. Additionally, Hyper-V host folder shares may become unavailable in Linux VMs, and USB audio devices may fail to start or produce any sound.
Seker emphasizes that the pressure to patch faster creates an unavoidable tension between security urgency and regression testing. “Patch management has effectively become part of operational resilience,” he says. “Delaying patches can leave organizations exposed to active exploitation, but deploying a problematic update directly into production can disrupt critical services.”
To mitigate these risks, Seker recommends applying risk-based patching using staged deployment rings, representative test environments, rollback capabilities, and enhanced monitoring. Tyler Reguly, Associate Director of Security R&D at Fortra, agrees that security teams need to be more diligent about verifying patches before wide-scale deployment.
The lack of external safeguards means that testing patches as they roll out is critical. “We should never let ourselves get to the point of immediately pushing updates without proper testing,” Reguly says. As patch volumes and software complexity increase, organizations must become better at safely deploying patches rather than assuming vendors will eliminate every unintended side effect before release.
In conclusion, while Microsoft’s emergency fixes are a welcome development, they highlight the need for more robust patch management strategies. By being proactive and vigilant in testing and verifying patches, security teams can minimize the risk of faulty updates causing disruptions to critical services. As Seker notes, “Organizations need to become better at safely deploying patches rather than assuming vendors will be able to eliminate every unintended side effect before release.”
Source: Dark Reading — 2026-09-15