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Fencer Vulns
high 7.8

CVE-2023-0494 json

A vulnerability was found in X.Org.

published 2023-03-27 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-12542

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 59%
public exploits
0
none known

Summary

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.

Patch / fix

  • x.org x_server 21.1.7
  • xwayland Debian 14, Debian 13, Debian 12 2:22.1.8-1
  • xorg-server Debian 14, Debian 13, Debian 12 2:21.1.7-1

debian advisories DEBIAN-CVE-2023-0494

  • xwayland Ubuntu 22.04 LTS 2:22.1.1-1ubuntu0.5
  • xorg-server Ubuntu 18.04 LTS 2:1.19.6-1ubuntu4.14
  • xorg-server Ubuntu 20.04 LTS 2:1.20.13-1ubuntu1~20.04.6
  • xorg-server Ubuntu 22.04 LTS 2:21.1.3-2ubuntu2.7
  • xorg-server-hwe-18.04 Ubuntu 18.04 LTS 2:1.20.8-2ubuntu2.2~18.04.10
  • xorg-server Ubuntu Pro 14.04 LTS 2:1.15.1-0ubuntu2.11+esm7
  • xorg-server Ubuntu Pro 16.04 LTS 2:1.18.4-0ubuntu0.12+esm5
  • xorg-server-hwe-16.04 Ubuntu Pro 16.04 LTS 2:1.19.6-1ubuntu4.1~16.04.6+esm4

ubuntu advisories UBUNTU-CVE-2023-0494

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • tigervnc RHEL 7 1.8.0-24.el7_9
  • xorg-x11-server RHEL 7 1.20.4-22.el7_9
  • tigervnc-icons RHEL 7 1.8.0-24.el7_9
  • tigervnc-server RHEL 7 1.8.0-24.el7_9
  • tigervnc-license RHEL 7 1.8.0-24.el7_9
  • xorg-x11-server-Xdmx RHEL 7 1.20.4-22.el7_9
  • xorg-x11-server-Xorg RHEL 7 1.20.4-22.el7_9
  • xorg-x11-server-Xvfb RHEL 7 1.20.4-22.el7_9

red hat advisories RHSA-2025:12751RHSA-2023:0671RHSA-2023:0675RHSA-2023:0663RHSA-2023:0665RHSA-2023:0662

  • xwayland SLE Workstation Extension 15 SP4, openSUSE Leap 15.4 21.1.4-150400.3.9.1
  • xorg-x11-server SLE Module for Development Tools 15 SP4, SLE Module for Basesystem 15 SP4, openSUSE Leap 15.4 1.20.3-150400.38.16.1
  • xorg-x11-server SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 1.19.6-10.43.1
  • xorg-x11-server SLES for SAP 15 SP3, SLES for SAP 15 SP2, SLES 15 SP3-LTSS +12 more 1.20.3-150200.22.5.66.1
  • xorg-x11-server SLES 12 SP2-BCL 7.6_1.18.3-76.60.1
  • xorg-x11-server SLES for SAP 12 SP4, SLES 12 SP4-LTSS, OpenStack Cloud Crowbar 9 +1 more 1.19.6-4.42.1
  • xorg-x11-server SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLE High Performance Computing 15 SP1-LTSS 1.20.3-150100.14.5.36.1

suse advisories SUSE-SU-2023:0289-1SUSE-SU-2023:0288-1SUSE-SU-2023:0287-1SUSE-SU-2023:0286-1SUSE-SU-2023:0285-1SUSE-SU-2023:0284-1

  • xorg-x11-server openSUSE Tumbleweed 21.1.7-1.1
  • xwayland openSUSE Tumbleweed 22.1.8-1.1

opensuse advisories openSUSE-SU-2024:12664-1openSUSE-SU-2024:12665-1

  • xorg-x11-server-Xwayland AlmaLinux 8 21.1.3-10.el8
  • xorg-x11-server-Xdmx AlmaLinux 8 1.20.11-15.el8
  • xorg-x11-server-Xorg AlmaLinux 8 1.20.11-15.el8
  • xorg-x11-server-Xvfb AlmaLinux 8 1.20.11-15.el8
  • xorg-x11-server-Xnest AlmaLinux 8 1.20.11-15.el8
  • xorg-x11-server-common AlmaLinux 8 1.20.11-15.el8
  • xorg-x11-server-source AlmaLinux 8 1.20.11-15.el8
  • xorg-x11-server-Xephyr AlmaLinux 8 1.20.11-15.el8

almalinux advisories ALSA-2023:2805ALSA-2023:2806ALSA-2023:2248ALSA-2023:2249ALSA-2023:0662ALSA-2023:0622

  • tigervnc Rocky Linux 9 1.12.0-5.el9_1.1
  • tigervnc Rocky Linux 8 1.12.0-9.el8_7.1

rocky linux advisories RLSA-2023:0622RLSA-2023:0662

  • xwayland Alpine 3.24, Alpine 3.23, Alpine 3.22 +5 more 22.1.8-r0
  • xorg-server Alpine 3.24, Alpine 3.23, Alpine 3.22 +5 more 21.1.7-r0

alpine advisories ALPINE-CVE-2023-0494

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-0494 updated cvss 7.8

xorg-x11-server: DeepCopyPointerClasses use-after-free leads to privilege elevation

  • Red Hat Enterprise Linux 6 xorg-x11-server, xorg-x11-server-Xdmx, xorg-x11-server-Xorg, xorg-x11-server-Xvfb, xorg-x11-server-Xnest, xorg-x11-server-common, +2 more
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) tigervnc 1.12.0-9.el8_7.1, xorg-x11-server 1.20.11-15.el8, tigervnc-icons 1.12.0-9.el8_7.1, tigervnc-server 1.12.0-9.el8_7.1, tigervnc-license 1.12.0-9.el8_7.1, tigervnc-selinux 1.12.0-9.el8_7.1, +9 more
    fixed: vendor fix RHSA-2023:0662
  • Red Hat Enterprise Linux AppStream (v. 9) tigervnc 1.12.0-5.el9_1.1, xorg-x11-server 1.20.11-17.el9, tigervnc-icons 1.12.0-5.el9_1.1, tigervnc-server 1.12.0-5.el9_1.1, tigervnc-license 1.12.0-5.el9_1.1, tigervnc-selinux 1.12.0-5.el9_1.1, +9 more
    fixed: vendor fix RHSA-2023:0622
  • Red Hat Enterprise Linux AppStream AUS (v. 8.2) tigervnc 1.9.0-15.el8_2.1, tigervnc-icons 1.9.0-15.el8_2.1, tigervnc-server 1.9.0-15.el8_2.1, tigervnc-license 1.9.0-15.el8_2.1, tigervnc-server-applet 1.9.0-15.el8_2.1, tigervnc-server-module 1.9.0-15.el8_2.1, +1 more
    fixed: vendor fix RHSA-2023:0671
  • Red Hat Enterprise Linux AppStream E4S (v. 8.1) tigervnc 1.9.0-16.el8_1.1, tigervnc-icons 1.9.0-16.el8_1.1, tigervnc-server 1.9.0-16.el8_1.1, tigervnc-license 1.9.0-16.el8_1.1, tigervnc-server-applet 1.9.0-16.el8_1.1, tigervnc-server-module 1.9.0-16.el8_1.1, +1 more
    fixed: vendor fix RHSA-2023:0665
  • Red Hat Enterprise Linux AppStream E4S (v. 8.2) tigervnc 1.9.0-15.el8_2.1, tigervnc-icons 1.9.0-15.el8_2.1, tigervnc-server 1.9.0-15.el8_2.1, tigervnc-license 1.9.0-15.el8_2.1, tigervnc-server-applet 1.9.0-15.el8_2.1, tigervnc-server-module 1.9.0-15.el8_2.1, +1 more
    fixed: vendor fix RHSA-2023:0671
  • Red Hat Enterprise Linux AppStream EUS (v.8.4) tigervnc 1.11.0-8.el8_4.1, tigervnc-icons 1.11.0-8.el8_4.1, tigervnc-server 1.11.0-8.el8_4.1, tigervnc-license 1.11.0-8.el8_4.1, tigervnc-selinux 1.11.0-8.el8_4.1, tigervnc-server-module 1.11.0-8.el8_4.1, +1 more
    fixed: vendor fix RHSA-2023:0664
  • Red Hat Enterprise Linux AppStream EUS (v.8.6) tigervnc 1.12.0-6.el8_6.1, tigervnc-icons 1.12.0-6.el8_6.1, tigervnc-server 1.12.0-6.el8_6.1, tigervnc-license 1.12.0-6.el8_6.1, tigervnc-selinux 1.12.0-6.el8_6.1, tigervnc-server-module 1.12.0-6.el8_6.1, +1 more
    fixed: vendor fix RHSA-2023:0663
show 9 more
  • Red Hat Enterprise Linux AppStream EUS (v.9.0) tigervnc 1.11.0-22.el9_0.1, tigervnc-icons 1.11.0-22.el9_0.1, tigervnc-server 1.11.0-22.el9_0.1, tigervnc-license 1.11.0-22.el9_0.1, tigervnc-selinux 1.11.0-22.el9_0.1, tigervnc-server-module 1.11.0-22.el9_0.1, +1 more
    fixed: vendor fix RHSA-2023:0623
  • Red Hat Enterprise Linux AppStream TUS (v. 8.2) tigervnc 1.9.0-15.el8_2.1, tigervnc-icons 1.9.0-15.el8_2.1, tigervnc-server 1.9.0-15.el8_2.1, tigervnc-license 1.9.0-15.el8_2.1, tigervnc-server-applet 1.9.0-15.el8_2.1, tigervnc-server-module 1.9.0-15.el8_2.1, +1 more
    fixed: vendor fix RHSA-2023:0671
  • Red Hat Enterprise Linux Client (v. 7) tigervnc 1.8.0-24.el7_9, tigervnc-icons 1.8.0-24.el7_9, tigervnc-server 1.8.0-24.el7_9, tigervnc-license 1.8.0-24.el7_9, xorg-x11-server 1.20.4-22.el7_9, xorg-x11-server-Xorg 1.20.4-22.el7_9, +3 more Red Hat Enterprise Linux Client Optional (v. 7) xorg-x11-server-Xdmx 1.20.4-22.el7_9, xorg-x11-server-Xvfb 1.20.4-22.el7_9, tigervnc-server-applet 1.8.0-24.el7_9, tigervnc-server-module 1.8.0-24.el7_9, xorg-x11-server-Xnest 1.20.4-22.el7_9, xorg-x11-server-source 1.20.4-22.el7_9, +1 more Red Hat Enterprise Linux ComputeNode Optional (v. 7) tigervnc 1.8.0-24.el7_9, tigervnc-icons 1.8.0-24.el7_9, tigervnc-server 1.8.0-24.el7_9, xorg-x11-server 1.20.4-22.el7_9, xorg-x11-server-Xdmx 1.20.4-22.el7_9, xorg-x11-server-Xorg 1.20.4-22.el7_9, +8 more
    fixed: vendor fix RHSA-2023:0675
  • Red Hat Enterprise Linux CRB (v. 8) xorg-x11-server-source 1.20.11-15.el8
    fixed: vendor fix RHSA-2023:2806
  • Red Hat Enterprise Linux CRB (v. 9) xorg-x11-server-source 1.20.11-17.el9
    fixed: vendor fix RHSA-2023:2248
  • Red Hat Enterprise Linux Server -EXTENSION(v. 6 ELS-EXTENSION) tigervnc 1.1.0-25.el6_10.13, tigervnc-server 1.1.0-25.el6_10.13
    fixed: vendor fix RHSA-2025:12751
  • Red Hat Enterprise Linux Server (v. 7) tigervnc 1.8.0-24.el7_9, tigervnc-icons 1.8.0-24.el7_9, tigervnc-server 1.8.0-24.el7_9, tigervnc-license 1.8.0-24.el7_9, xorg-x11-server 1.20.4-22.el7_9, xorg-x11-server-Xorg 1.20.4-22.el7_9, +3 more
    fixed: vendor fix RHSA-2023:0675
  • Red Hat Enterprise Linux Server Optional -EXTENSION (v. 6 ELS -EXTENSION) tigervnc-server-applet 1.1.0-25.el6_10.13, tigervnc-server-module 1.1.0-25.el6_10.13
    fixed: vendor fix RHSA-2025:12751
  • Red Hat Enterprise Linux Server Optional (v. 7) xorg-x11-server-Xdmx 1.20.4-22.el7_9, xorg-x11-server-Xvfb 1.20.4-22.el7_9, tigervnc-server-applet 1.8.0-24.el7_9, tigervnc-server-module 1.8.0-24.el7_9, xorg-x11-server-Xnest 1.20.4-22.el7_9, xorg-x11-server-source 1.20.4-22.el7_9, +1 more Red Hat Enterprise Linux Workstation (v. 7) tigervnc 1.8.0-24.el7_9, tigervnc-icons 1.8.0-24.el7_9, tigervnc-server 1.8.0-24.el7_9, tigervnc-license 1.8.0-24.el7_9, xorg-x11-server 1.20.4-22.el7_9, xorg-x11-server-Xorg 1.20.4-22.el7_9, +3 more Red Hat Enterprise Linux Workstation Optional (v. 7) xorg-x11-server-Xdmx 1.20.4-22.el7_9, xorg-x11-server-Xvfb 1.20.4-22.el7_9, tigervnc-server-applet 1.8.0-24.el7_9, tigervnc-server-module 1.8.0-24.el7_9, xorg-x11-server-Xnest 1.20.4-22.el7_9, xorg-x11-server-source 1.20.4-22.el7_9, +1 more
    fixed: vendor fix RHSA-2023:0675

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-24-046-11 updated cvss 7.8

Siemens SCALANCE XCM-/XRM-300

  • Siemens SCALANCE XCH328 (6GK5328-4TS01-2EC2) <V2.4 Siemens SCALANCE XCM324 (6GK5324-8TS01-2AC2) <V2.4 Siemens SCALANCE XCM328 (6GK5328-4TS01-2AC2) <V2.4 Siemens SCALANCE XCM332 (6GK5332-0GA01-2AC2) <V2.4 Siemens SCALANCE XRH334 (24 V DC, 8xFO, CC) (6GK5334-2TS01-2ER3) <V2.4 Siemens SCALANCE XRM334 (2x230 V AC, 8xFO) (6GK5334-2TS01-4AR3) <V2.4
    +5 more products
    Siemens SCALANCE XRM334 (2x230 V AC, 12xFO) (6GK5334-3TS01-4AR3) <V2.4 Siemens SCALANCE XRM334 (24 V DC, 8xFO) (6GK5334-2TS01-2AR3) <V2.4 Siemens SCALANCE XRM334 (24 V DC, 12xFO) (6GK5334-3TS01-2AR3) <V2.4 Siemens SCALANCE XRM334 (230 V AC, 8xFO) (6GK5334-2TS01-3AR3) <V2.4 Siemens SCALANCE XRM334 (230 V AC, 12xFO) (6GK5334-3TS01-3AR3) <V2.4
    affected: fixed in V2.4 support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
20 mo ago

Exploit prediction

0.90% chance of exploitation in the next 30 days, higher than 59% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • n/a xorg-x11-server

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.