Vulnerabilities
Misconfiguration
Compliance
CVE Vulnerabilities

CVE-2018-15857

Use After Free

Published: Aug 25, 2018 | Modified: Nov 21, 2024
CVSS 3.x
7.8
HIGH
Source:
NVD
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
4.6 MEDIUM
AV:L/AC:L/Au:N/C:P/I:P/A:P
RedHat/V2
RedHat/V3
5.3 MODERATE
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
Ubuntu
MEDIUM
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2018-15857
CWEhttps://cwe.mitre.org/data/definitions/416.html

An invalid free in ExprAppendMultiKeysymList in xkbcomp/ast-build.c in xkbcommon before 0.8.1 could be used by local attackers to crash xkbcommon keymap parsers or possibly have unspecified other impact by supplying a crafted keymap file.

Weakness

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.

Affected Software

NameVendorStart VersionEnd Version
LibxkbcommonXkbcommon*0.8.1 (excluding)
XkbcommonXkbcommon*0.8.1 (excluding)
Red Hat Enterprise Linux 7RedHatgdm-1:3.28.2-16.el7*
Red Hat Enterprise Linux 7RedHatlibX11-0:1.6.7-2.el7*
Red Hat Enterprise Linux 7RedHatlibxkbcommon-0:0.7.1-3.el7*
Red Hat Enterprise Linux 7RedHatmesa-libGLw-0:8.0.0-5.el7*
Red Hat Enterprise Linux 7RedHatxorg-x11-drv-ati-0:19.0.1-2.el7*
Red Hat Enterprise Linux 7RedHatxorg-x11-drv-vesa-0:2.4.0-3.el7*
Red Hat Enterprise Linux 7RedHatxorg-x11-drv-wacom-0:0.36.1-3.el7*
Red Hat Enterprise Linux 7RedHatxorg-x11-server-0:1.20.4-7.el7*
LibxkbcommonUbuntubionic*
LibxkbcommonUbuntuesm-infra/bionic*
LibxkbcommonUbuntuesm-infra/xenial*
LibxkbcommonUbuntutrusty*
LibxkbcommonUbuntuupstream*
LibxkbcommonUbuntuxenial*

Potential Mitigations

References

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