drivers/input/serio/i8042.c in the Linux kernel before 4.12.4 allows attackers to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact because the port->exists value can change after it is validated.
3.13.0-149.1994.4.0-93.116~14.04.14.4.0-93.1164.4.0-1032.414.13.0-1005.74.13.0-1002.54.4.0-1028.284.13.0-32.35~16.04.14.4.0-1071.794.4.0-1073.78Exploitability
AV:LAC:LPR:LUI:NScope
S:UImpact
C:HI:HA:HCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H