Description: vt_do_kdgkb_ioctl use-after-free
References:
 https://www.openwall.com/lists/oss-security/2020/10/16/1
Notes:
Bugs:
upstream:
4.19-upstream-stable:
4.9-upstream-stable:
sid:
4.19-buster-security:
4.9-stretch-security: