CVE-2018-15862

Publication date 25 August 2018

Last updated 25 August 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

5.5 · Medium

Score breakdown

Description

Unchecked NULL pointer usage in LookupModMask 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 with invalid virtual modifiers.

Status

Package Ubuntu Release Status
libxkbcommon 18.10 cosmic
Not affected
18.04 LTS bionic
Fixed 0.8.0-1ubuntu0.1
16.04 LTS xenial
Fixed 0.5.0-1ubuntu2.1
14.04 LTS trusty
Fixed 0.4.1-0ubuntu1.1

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
libxkbcommon

Severity score breakdown

Parameter Value
Base score 5.5 · Medium
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

    • USN-3786-2
    • libxkbcommon vulnerabilities
    • 6 November 2018
    • USN-3786-1
    • libxkbcommon vulnerabilities
    • 8 October 2018

Other references