CVE-2018-16658

Severity: medium (CVSS 6.1 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-09-07 · updated 2026-06-17
Weakness: CWE-200

Description

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: 12.04, 14.04, 16.04, 18.04
Debian Linux: 8.0, 9.0
Linux kernel: before 4.18.6 — fixed in 4.18.6

How to fix

Upgrade to a fixed version: Linux kernel 4.18.6. Check the vendor advisory for mitigations.

References

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=8f3fafc9c2f0ece10832c25f7ffcb07c97a32ad4
http://www.securityfocus.com/bid/105334
https://access.redhat.com/errata/RHSA-2019:2029
https://access.redhat.com/errata/RHSA-2019:2043
https://access.redhat.com/errata/RHSA-2019:4154
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.6
https://github.com/torvalds/linux/commit/8f3fafc9c2f0ece10832c25f7ffcb07c97a32ad4
https://lists.debian.org/debian-lts-announce/2018/10/msg00003.html
https://usn.ubuntu.com/3797-1/
https://usn.ubuntu.com/3797-2/
https://usn.ubuntu.com/3820-1/
https://usn.ubuntu.com/3820-2/

Get alerted when CVE-2018-16658 or the next vulnerability affects your stack