PT-2018-13249 · Xkbcommon+7 · Xkbcommon+7

CVE-2018-15859 · Published 2018-08-09 · Updated 2026-02-24

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions xkbcommon versions prior to 0.8.2

Description The issue arises from unchecked NULL pointer usage when parsing invalid atoms in ExprResolveLhs in xkbcomp/expr.c. This could be exploited by local attackers to crash the xkbcommon parser by supplying a crafted keymap file, as lookup failures are mishandled.

Recommendations For versions prior to 0.8.2, update to version 0.8.2 or later to resolve the issue. As a temporary workaround, consider restricting access to the xkbcommon parser to minimize the risk of exploitation.

Fix

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

ALT-PU-2018-2114

CESA-2019_2079

CVE-2018-15859

ECHO-0A46-045E-587B

MGASA-2018-0369

MGASA-2025-0321

OPENSUSE-SU-2018_3802-1

OPENSUSE-SU-2025:15815-1

OPENSUSE-SU-2026:20123-1

RHSA-2019:2079

RHSA-2019_2079

SUSE-SU-2018:3685-1

SUSE-SU-2024:0037-1

SUSE-SU-2025:4407-1

SUSE-SU-2025:4426-1

SUSE-SU-2026:20186-1

USN-3786-1

USN-3786-2

Affected Products

Alt Linux

Centos

Debian

Red Hat

Red Os

Suse

Ubuntu

Xkbcommon

References · 65

• https://github.com/xkbcommon/libxkbcommon/commit/bb4909d2d8fa6b08155e449986a478101e2b2634 · Patch
• https://osv.dev/vulnerability/SUSE-SU-2026:20186-1 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2018-15859 · Vendor Advisory
• https://ubuntu.com/security/CVE-2018-15859 · Vendor Advisory
• https://ubuntu.com/security/CVE-2018-15857 · Vendor Advisory
• https://ubuntu.com/security/CVE-2018-15854 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2018-15859 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2024:0037-1 · Vendor Advisory
• https://osv.dev/vulnerability/USN-3786-1 · Vendor Advisory
• https://usn.ubuntu.com/3786-1 · Vendor Advisory
• https://security.gentoo.org/glsa/201810-05 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2025:15815-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2018-15858 · Vendor Advisory
• https://advisories.mageia.org/MGASA-2025-0321.html · Security Note
• https://advisories.mageia.org/MGASA-2018-0369.html · Security Note