The Linux kernel, as used in Ubuntu 18.10 and when booted with UEFI Secure Boot enabled, allows privileged local users to bypass intended Secure Boot restrictions and execute untrusted code by loading arbitrary kernel modules. This occurs because a modified kernel/module.c, in conjunction with certain configuration options, leads to mishandling of the result of signature verification.[…]

Source: MITRE
Description Last Modified: 10/25/2018

https://nvd.nist.gov/vuln/detail/CVE-2018-18653

[…]This flaw is introduced by certain configuration options in combination with this out-of-tree patch from the Lockdown patchset[…]

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1798863

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1798863/comments/23

https://vuldb.com/?id.125976
Current Exploit Price (≈) $5k-$25k