CVE-2018-16658: Canonical Ubuntu Linux

Medium severity, CVSS 6.1. EPSS: 0.6% chance of exploitation in the next 30 days.

An issue was discovered in the Linux kernel before 4.18.6. An information leak in cdrom_ioctl_drive_status in drivers/cdrom/cdrom.c could be used by local attackers to read kernel memory because a cast from unsigned long to int interferes with bounds checking. This is similar to CVE-2018-10940.

Affected products

• Canonical Ubuntu Linux: version 12.04 only; version 14.04 only; version 16.04 only; version 18.04 only
• Debian Debian Linux: version 8.0 only; version 9.0 only
• Linux Linux Kernel: before 4.18.6 (fixed in 4.18.6)

Published 2018-09-07. Last modified 2026-06-17.