An information disclosure vulnerability exists when the Windows kernel improperly initializes objects in memory.To exploit this vulnerability, an authenticated attacker could run a specially crafted application, aka 'Windows Kernel Information Disclosure Vulnerability'.
https://www.tenable.com/blog/tenable-roundup-for-microsofts-june-2019-patch-tuesday
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1039