CVE-2018-18653
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.31%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.0
- 7.8 HIGHCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.31% probability · 24th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-347
- Affected
- canonical/ubuntu linux
- Source
- cve@mitre.org
References
- https://launchpad.net/bugs/1798863Exploit, Issue Tracking, Vendor Advisory
- https://usn.ubuntu.com/3832-1/Patch, Vendor Advisory
- https://usn.ubuntu.com/3835-1/Patch, Vendor Advisory
- https://launchpad.net/bugs/1798863Exploit, Issue Tracking, Vendor Advisory
- https://usn.ubuntu.com/3832-1/Patch, Vendor Advisory
- https://usn.ubuntu.com/3835-1/Patch, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.