What is CVE-2018-16658?

CVE-2018-16658 is a medium-severity vulnerability in Linux Kernel, classified under Information Disclosure. CVSS score: 6.1/10. Published 2018-09-07.

How severe is CVE-2018-16658?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2018-16658 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Information disclosure in Linux Kernel

CVE-2018-16658

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.

Vulnerability class: Information Disclosure

Published 2018-09-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H.

EPSS exploit prediction

EPSS: 0.006 (44.1th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 44.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Linux Kernel
Canonical Ubuntu Linux — versions 12.04, 14.04, 16.04
Debian Linux — versions 8.0, 9.0

Weakness classification (CWE)

CWE-200 — Information Disclosure

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/ (Patch, Mailing List, Third Party Advisory)
usn.ubuntu.com/3797-2/ (vendor-advisory, Third Party Advisory, Mitigation)
usn.ubuntu.com/3797-1/ (vendor-advisory, Third Party Advisory, Mitigation)
lists.debian.org/debian-lts-announce/2018/10/msg00003.html (mailing-list, Mailing List, Third Party Advisory)
usn.ubuntu.com/3820-1/ (vendor-advisory, Third Party Advisory)
usn.ubuntu.com/3820-2/ (vendor-advisory, Third Party Advisory)
cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.6 (Technical Description, Release Notes)
www.debian.org/security/2018/dsa-4308 (vendor-advisory, Third Party Advisory)
github.com/torvalds/linux/commit/8f3fafc9c2f0ece10832c25f7ffcb07c97a32ad4 (Patch)
usn.ubuntu.com/3822-2/ (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2018-16658?: CVE-2018-16658 is a medium-severity vulnerability in Linux Kernel, classified under Information Disclosure. CVSS score: 6.1/10. Published 2018-09-07.
How severe is CVE-2018-16658?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2018-16658 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.