McAfee and Avast discovered why Windows’ updates conflict with their software

Issue with Windows upload that recently encountered users of side safety decisions, is mostly likeably was caused by April safety update for Client/Server Runtime Subsystem (CSRSS).

Another volume of monthly updates for Microsoft products were launched on April 9. After their installation many users of Windows 7, Windows 8.1, Windows 2008, Windows 2008 R2, Windows 2012 and Windows 2012 R2 discovered that system does not response. To be precise, with issue encountered systems with installed antimalware soft from Avast, Avira, McAfee and Sophos.

What particularly causes conflict between software and OS after installation of April updates, specialists cannot say for sure. Nevertheless, according to McAfee support bulletin, the culprit of a failure is safety update for CSRSS.

“Changes in the Windows April 2019 updates for Client Server Runtime Subsystem (CSRSS) introduced a potential deadlock with ENS”, – reported in the bulletin.

Avast also published problem solution, according to which failure is linked to CSRSS.

Most probable that this is security update that fixes CVE-2019-0735 vulnerability in CSRSS. With its help, authorized intruder can raise its privileges and start random code. It seem to be that patch for vulnerability makes changes that cause conflict between security solutions from mentioned above producers, and Windows, to be precise, with it CSRSS.

Microsoft does not comments conflicts benween Windows updates and antivirus software.

Sources: https://kc.mcafee.com, https://kb.support.business.avast.com