An elevation of privilege vulnerability exists in the way that the Windows Network File System (NFS) handles objects in memory, aka 'Windows Network File System Elevation of Privilege 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-2019-1045