The Linux kernel before version 5.8 is vulnerable to a NULL pointer dereference in drivers/tty/serial/8250/8250_core.c:serial8250_isa_init_ports() that allows local users to cause a denial of service by using the p->serial_in pointer which uninitialized.
4.4.0-189.2194.4.0-1113.1264.15.0-1080.84~16.04.14.15.0-1093.103~16.04.14.15.0-1081.92~16.04.14.15.0-115.116~16.04.14.10.0-14.16~16.04.14.10.0-19.21~16.04.14.10.0-20.22~16.04.14.10.0-21.23~16.04.14.10.0-22.24~16.04.14.10.0-24.28~16.04.14.10.0-26.30~16.04.14.11.0-13.19~16.04.14.11.0-14.20~16.04.14.13.0-16.19~16.04.3+13 more4.4.0-1079.864.15.0-1051.55~16.04.14.4.0-1138.147Exploitability
AV:LAC:LPR:HUI:NScope
S:UImpact
C:NI:NA:HCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H