CVE-2018-15859

Name: CVE-2018-15859
Creator: NVD / NIST
Published: 2018-08-25T21:29:02.17+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 0.53%

Last modified Jun 17, 2026

CVE-2018-15859 is a vulnerability of currently unknown severity. Unchecked NULL pointer usage when parsing invalid atoms in ExprResolveLhs in xkbcomp/expr.c in xkbcommon before 0.8.2 could be used by local attackers to crash (NULL pointer dereference) the xkbcommon parser by supplying a crafted keymap file, because lookup failures are mishandled.. EPSS estimates a 0.53% chance of exploitation in the next 30 days.

Description

Unchecked NULL pointer usage when parsing invalid atoms in ExprResolveLhs in xkbcomp/expr.c in xkbcommon before 0.8.2 could be used by local attackers to crash (NULL pointer dereference) the xkbcommon parser by supplying a crafted keymap file, because lookup failures are mishandled.

Metrics

EPSS Probability

0.53%

41.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-476

Affected Software

Vendor	Product	Versions
Xkbcommon	Libxkbcommon	<= 0.8.1
Xkbcommon	Xkbcommon	<= 0.8.1
Canonical	Ubuntu Linux	14.04
Canonical	Ubuntu Linux	16.04
Canonical	Ubuntu Linux	18.04

References

https://access.redhat.com/errata/RHSA-2019:2079
https://github.com/xkbcommon/libxkbcommon/commit/bb4909d2d8fa6b08155e449986a478101e2b2634Patch, Third Party Advisory
https://lists.freedesktop.org/archives/wayland-devel/2018-August/039243.htmlMailing List, Patch, Third Party Advisory
https://security.gentoo.org/glsa/201810-05Third Party Advisory
https://usn.ubuntu.com/3786-1/Third Party Advisory
https://usn.ubuntu.com/3786-2/Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:2079
https://github.com/xkbcommon/libxkbcommon/commit/bb4909d2d8fa6b08155e449986a478101e2b2634Patch, Third Party Advisory
https://lists.freedesktop.org/archives/wayland-devel/2018-August/039243.htmlMailing List, Patch, Third Party Advisory
https://security.gentoo.org/glsa/201810-05Third Party Advisory
https://usn.ubuntu.com/3786-1/Third Party Advisory
https://usn.ubuntu.com/3786-2/Third Party Advisory

Timeline

Published: Aug 25, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-15859?

How severe is CVE-2018-15859?

Severity scoring for CVE-2018-15859 is pending analysis. The EPSS model estimates a 0.53% probability of exploitation in the next 30 days.

How do I fix CVE-2018-15859?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-15859?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST