The vulnerability was reported to Microsoft by Kaspersky Lab.
Advisory: SB2021060815 - OS Kernel information disclosure Microsoft Windows
Vulnerable component: Windows
CVSSv3 score: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:H/RL:O/RC:C
CWE-ID: CWE-269 - Improper Privilege Management
The vulnerability allows a local user to gain access to sensitive information.
The vulnerability exists due to improper privilege management. A local unprivileged user can read contents of Kernel memory from a user mode process.
Note, the vulnerability is being actively exploited in the wild.