A vulnerability was found in the Linux Kernel where the function sunkbd_reinit having been scheduled by sunkbd_interrupt before sunkbd being freed. Though the dangling pointer is set to NULL in sunkbd_disconnect, there is still an alias in sunkbd_reinit causing Use After Free.
https://github.com/torvalds/linux/commit/77e70d351db7de07a46ac49b87a6c3c7a60fca7e
https://lists.debian.org/debian-lts-announce/2020/12/msg00027.html
http://www.openwall.com/lists/oss-security/2020/11/20/5
https://lists.debian.org/debian-lts-announce/2020/12/msg00015.html
http://www.openwall.com/lists/oss-security/2020/11/05/2
https://www.openwall.com/lists/oss-security/2020/11/05/2,
Source: MITRE
Published: 2021-05-26
Updated: 2022-05-13
Type: CWE-416
Base Score: 7.2
Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C
Impact Score: 10
Exploitability Score: 3.9
Severity: HIGH
Base Score: 7.8
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 1.8
Severity: HIGH