A flaw was found in the Linux kernel. A use-after-free was found in the way the console subsystem was using ioctls KDGKBSENT and KDSKBSENT. A local user could use this flaw to get read memory access out of bounds. The highest threat from this vulnerability is to data confidentiality.
https://lkml.org/lkml/2020/10/29/528
https://lkml.org/lkml/2020/10/16/84
https://bugzilla.redhat.com/show_bug.cgi?id=1888726
https://lists.debian.org/debian-lts-announce/2020/12/msg00015.html
https://lists.debian.org/debian-lts-announce/2020/12/msg00027.html
Source: MITRE
Published: 2020-12-02
Updated: 2022-10-25
Type: CWE-416
Base Score: 1.9
Vector: AV:L/AC:M/Au:N/C:P/I:N/A:N
Impact Score: 2.9
Exploitability Score: 3.4
Severity: LOW
Base Score: 4.1
Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N
Impact Score: 3.6
Exploitability Score: 0.5
Severity: MEDIUM