According to Kaspersky Lab, the vulnerability is being actively exploited by the FruityArmor APT actor.
Vulnerable component: Windows
CVSSv3 score: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C
CWE-ID: CWE-416 - Use After Free
The vulnerability allows a local attacker to gain elevated privileges on the target system.
The vulnerability exists due to a use-after free error in win32kfull!xxxDestroyWindow Win32k component. A local user can run a specially crafted application, trigger memory corruption and execute arbitrary code in kernel mode.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Note: the vulnerability has been actively exploited in the wild.