CVE-2023-0494

HIGH

X.org X Server < 21.1.7 - Use After Free

Title source: rule

Description

A vulnerability was found in X.Org. This issue occurs due to a dangling pointer in DeepCopyPointerClasses that can be exploited by ProcXkbSetDeviceInfo() and ProcXkbGetDeviceInfo() to read and write into freed memory. This can lead to local privilege elevation on systems where the X server runs privileged and remote code execution for ssh X forwarding sessions.

References (4)

[Issue Tracking, Third Party Advisory] https://bugzilla.redhat.com/show_bug.cgi?id=2165995

[Patch] https://gitlab.freedesktop.org/xorg/xserver/-/commit/0ba6d8c37071131a49790243cdac55392ecf71ec

[Mailing List, Vendor Advisory] https://lists.x.org/archives/xorg-announce/2023-February/003320.html

[Third Party Advisory] https://security.gentoo.org/glsa/202305-30

Scores

CVSS v3 7.8

EPSS 0.0061

EPSS Percentile 69.5%

Attack Vector LOCAL

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Classification

CWE

CWE-416

Status published

Affected Products (35)

x.org/x_server < 21.1.7

fedoraproject/fedora

redhat/enterprise_linux

redhat/enterprise_linux_aus

redhat/enterprise_linux_desktop

redhat/enterprise_linux_eus

redhat/enterprise_linux_for_ibm_z_systems

redhat/enterprise_linux_for_ibm_z_systems_eus

... and 20 more

Timeline

Published Mar 27, 2023

Tracked Since Feb 18, 2026