CVE-2018-18653

Severity: high (CVSS 7.8 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2018-10-26 · updated 2026-06-17
Weakness: CWE-347

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.

Affected products

Canonical Ubuntu Linux: 18.10

References

https://launchpad.net/bugs/1798863
https://usn.ubuntu.com/3832-1/
https://usn.ubuntu.com/3835-1/
https://launchpad.net/bugs/1798863
https://usn.ubuntu.com/3832-1/
https://usn.ubuntu.com/3835-1/

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