There is a use-after-free vulnerability in the Linux kernel through 5.5.2 in the vgacon_invert_region function in drivers/video/console/vgacon.c.
https://bugzilla.kernel.org/show_bug.cgi?id=206357
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00039.html
https://lists.debian.org/debian-lts-announce/2020/06/msg00011.html
https://lists.debian.org/debian-lts-announce/2020/06/msg00013.html
https://lists.debian.org/debian-lts-announce/2020/06/msg00012.html
Source: MITRE
Published: 2020-02-06
Updated: 2021-12-30
Type: CWE-416
Base Score: 3.6
Vector: AV:L/AC:L/Au:N/C:P/I:N/A:P
Impact Score: 4.9
Exploitability Score: 3.9
Severity: LOW
Base Score: 5.9
Vector: CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Impact Score: 5.2
Exploitability Score: 0.7
Severity: MEDIUM