CVE-2018-18653

HIGH

Ubuntu Linux - Improper Verification of Cryptographic Signature

Title source: llm

Description

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.

References (3)

Core 3

Core References

Exploit, Issue Tracking, Vendor Advisory x_refsource_misc

https://launchpad.net/bugs/1798863

Patch, Vendor Advisory vendor-advisory x_refsource_ubuntu

https://usn.ubuntu.com/3835-1/

Patch, Vendor Advisory vendor-advisory x_refsource_ubuntu

https://usn.ubuntu.com/3832-1/

Scores

CVSS v3 7.8

EPSS 0.0003

EPSS Percentile 9.9%

Attack Vector LOCAL

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Details

CWE

CWE-347

Status published

Products (1)

canonical/ubuntu_linux 18.10

Published Oct 26, 2018

Tracked Since Feb 18, 2026