A few days ago, information appeared about a vulnerability in the Microsoft SMBv3 protocol that allows infecting groups of computers. According to the Microsoft MSRC, this compromises PCs running Windows 10 version 1903, Windows Server version 1903 (Server Core installation), Windows 10 version 1909, and Windows Server version 1909 (Server Core installation). In addition, the protocol is used in Windows 8 and Windows Server 2012.
The flaw is said to allow the SMB server and SMB client to be compromised through the use of a specially crafted package. And although the exploit code was not published, Microsoft quickly responded and update KB4551762, which was released literally immediately after the cumulative KB4540673. And yes, it closes the SMBv3 vulnerability, but it also causes new errors. However, in order.
KB4551762 like on the Microsoft support forum, breaks sound. After installing it, the audio simply does not play, although it is not yet clear how widespread the problem is.
But KB4540673 seems to be issues KB4532693, KB4535996. When rebooting, a temporary user profile is created again, which is loaded instead of the working one. Also reported are "blue screens of death", problems with Internet access, crashes of some applications.
Thus, a kind of scheme has already been formed in Redmond: to fix something while breaking something else. At the moment, the problem with updates is not recognized in the company, so you should not expect a quick solution.
Source: 3dnews.ru