What is CVE-2018-6559?

CVE-2018-6559 is a low-severity vulnerability in Canonical Ltd. Linux Kernel, As Used In Ubuntu 18.04 Lts And 18.10, classified under Information Disclosure. CVSS score: 3.3/10. Published 2018-10-26.

How severe is CVE-2018-6559?

Low severity. CVSS v3 base score is 3.3 out of 10.

Information disclosure in Canonical Ltd. Linux Kernel, As Used In Ubuntu 18.04 Lts And 18.10

CVE-2018-6559

The Linux kernel, as used in Ubuntu 18.04 LTS and Ubuntu 18.10, allows local users to obtain names of files in which they would not normally be able to access via an overlayfs mount inside of a user namespace.

Vulnerability class: Information Disclosure

Published 2018-10-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 3.3 (Low). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.005 (42.9th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 42.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Canonical Ltd. Linux Kernel, As Used In Ubuntu 18.04 Lts And 18.10 — versions 4.15.0-38.41, 4.18.0-10.11
Linux Kernel
Canonical Ubuntu Linux — versions 16.04, 18.04, 18.10

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

www.securityfocus.com/bid/105752 (VDB Entry, Third Party Advisory, vdb-entry)
usn.ubuntu.com/3836-2/ (vendor-advisory, Third Party Advisory)
usn.ubuntu.com/3835-1/ (vendor-advisory, Third Party Advisory)
people.canonical.com/~ubuntu-security/cve/2018/CVE-2018-6559.html (Third Party Advisory)
lists.ubuntu.com/archives/kernel-team/2018-October/096172.html (Third Party Advisory)
usn.ubuntu.com/3833-1/ (vendor-advisory, Third Party Advisory)
usn.ubuntu.com/3832-1/ (vendor-advisory, Third Party Advisory)
launchpad.net/bugs/1793458 (Exploit, Third Party Advisory, Issue Tracking)
usn.ubuntu.com/3836-1/ (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2018-6559?: CVE-2018-6559 is a low-severity vulnerability in Canonical Ltd. Linux Kernel, As Used In Ubuntu 18.04 Lts And 18.10, classified under Information Disclosure. CVSS score: 3.3/10. Published 2018-10-26.
How severe is CVE-2018-6559?: Low severity. CVSS v3 base score is 3.3 out of 10.