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Vulnerability record · CVE-2023-0494 · published 27 March 2023

CVE-2023-0494: X.org x server use after free vulnerability

XX.Org · X Server

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.

7.8 CVSS 3.1 High EPSS 0.90% · top 42.0% CWE-416 · Use after free
7.8CVSS 3.1 base score
0.90%EPSS exploitation probability, 30 days
NoNot in CISA KEV
18Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

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.

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

Affected products

18 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugzilla.redhat.com/show_bug.cgi?id=2165995 Issue TrackingThird Party Advisory
https://gitlab.freedesktop.org/xorg/xserver/-/commit/0ba6d8c37071131a49790243cdac55392ecf71ec Patch
https://lists.x.org/archives/xorg-announce/2023-February/003320.html Mailing ListVendor Advisory
https://security.gentoo.org/glsa/202305-30
https://bugzilla.redhat.com/show_bug.cgi?id=2165995 Issue TrackingThird Party Advisory
https://gitlab.freedesktop.org/xorg/xserver/-/commit/0ba6d8c37071131a49790243cdac55392ecf71ec Patch
https://lists.x.org/archives/xorg-announce/2023-February/003320.html Mailing ListVendor Advisory
https://security.gentoo.org/glsa/202305-30

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Source: NIST National Vulnerability Database (record CVE-2023-0494), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.