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TI-2023-00468 Aliases CVE-2023-0494GHSA-5v6x-2hpj-c37x

Use after free in xorg-x11-server

Priority LOW 38CWE-416Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 20 fixed, 1 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00899 59th percentileScored 2026-11-07
Fix Partial Red Hat: 13 advisoriesRed Hat: 20 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
—xorg-x11-serverxorg-server 21.1.7—No fix listedCNA
  • xorg-x11-server Vendor— Affected xorg-server 21.1.7 Fixed in — No fix listed CNA

CPE configurations NVD · 35

CPEVersionsRoleVendor
cpe:2.3:a:x.org:x_server:*:*:*:*:*:*:*:*before 21.1.7Vulnerablex.org
cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*36VulnerableFedoraproject
cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:*37VulnerableFedoraproject
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*8.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux:8.1:*:*:*:*:*:*:*8.1VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*9.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_aus:8.4:*:*:*:*:*:*:*8.4VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_aus:8.6:*:*:*:*:*:*:*8.6VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*7.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_eus:8.4:*:*:*:*:*:*:*8.4VulnerableRed Hat
  • cpe:2.3:a:x.org:x_server:*:*:*:*:*:*:*:* Versions before 21.1.7 Vulnerable ·x.org
  • cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:* Versions 36 Vulnerable ·Fedoraproject
  • cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:* Versions 37 Vulnerable ·Fedoraproject
  • cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux:8.1:*:*:*:*:*:*:* Versions 8.1 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_aus:8.4:*:*:*:*:*:*:* Versions 8.4 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_aus:8.6:*:*:*:*:*:*:* Versions 8.6 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_eus:8.4:*:*:*:*:*:*:* Versions 8.4 Vulnerable ·Red Hat
Show 25 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:redhat:enterprise_linux_eus:8.6:*:*:*:*:*:*:*8.6VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_eus:9.0:*:*:*:*:*:*:*9.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:7.0:*:*:*:*:*:*:*7.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:8.0:*:*:*:*:*:*:*8.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_eus:8.4:*:*:*:*:*:*:*8.4VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_eus:8.6:*:*:*:*:*:*:*8.6VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_for_power_big_endian:7.0:*:*:*:*:*:*:*7.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:7.0:*:*:*:*:*:*:*7.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:8.0:*:*:*:*:*:*:*8.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:9.0:*:*:*:*:*:*:*9.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_eus:8.4:*:*:*:*:*:*:*8.4VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_eus:8.6:*:*:*:*:*:*:*8.6VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_for_scientific_computing:7.0:*:*:*:*:*:*:*7.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*7.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_aus:8.2:*:*:*:*:*:*:*8.2VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions:8.1:*:*:*:*:*:*:*8.1VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions:8.2:*:*:*:*:*:*:*8.2VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions:8.4:*:*:*:*:*:*:*8.4VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions:8.6:*:*:*:*:*:*:*8.6VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions:9.0:*:*:*:*:*:*:*9.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_tus:8.2:*:*:*:*:*:*:*8.2VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_tus:8.4:*:*:*:*:*:*:*8.4VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_tus:8.6:*:*:*:*:*:*:*8.6VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_update_services_for_sap_solutions:8.2:*:*:*:*:*:*:*8.2VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_workstation:7.0:*:*:*:*:*:*:*7.0VulnerableRed Hat
  • cpe:2.3:o:redhat:enterprise_linux_eus:8.6:*:*:*:*:*:*:* Versions 8.6 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_eus:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_eus:8.4:*:*:*:*:*:*:* Versions 8.4 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_eus:8.6:*:*:*:*:*:*:* Versions 8.6 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_for_power_big_endian:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_eus:8.4:*:*:*:*:*:*:* Versions 8.4 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_eus:8.6:*:*:*:*:*:*:* Versions 8.6 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_for_scientific_computing:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_aus:8.2:*:*:*:*:*:*:* Versions 8.2 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions:8.1:*:*:*:*:*:*:* Versions 8.1 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions:8.2:*:*:*:*:*:*:* Versions 8.2 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions:8.4:*:*:*:*:*:*:* Versions 8.4 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions:8.6:*:*:*:*:*:*:* Versions 8.6 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_tus:8.2:*:*:*:*:*:*:* Versions 8.2 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_tus:8.4:*:*:*:*:*:*:* Versions 8.4 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_tus:8.6:*:*:*:*:*:*:* Versions 8.6 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_update_services_for_sap_solutions:8.2:*:*:*:*:*:*:* Versions 8.2 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_workstation:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat

Remediation

Red Hat 13 advisories

  • RHSA-2025:12751 Released 2025-08-04 · Red Hat rating Important
    tigervnc security update
    • 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
    • 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
  • RHSA-2023:2805 Released 2023-05-16 · Red Hat rating Moderate
    xorg-x11-server-Xwayland security update
    • Red Hat Enterprise Linux AppStream (v. 8) xorg-x11-server-Xwayland-21.1.3-10.el8
  • RHSA-2023:2806 Released 2023-05-16 · Red Hat rating Moderate
    xorg-x11-server security and bug fix update
    • Red Hat Enterprise Linux AppStream (v. 8) xorg-x11-server-1.20.11-15.el8, xorg-x11-server-Xdmx-1.20.11-15.el8, xorg-x11-server-Xephyr-1.20.11-15.el8 +4
    • Red Hat Enterprise Linux CRB (v. 8) xorg-x11-server-devel-1.20.11-15.el8, xorg-x11-server-source-1.20.11-15.el8
Show 10 more Red Hat advisories
  • RHSA-2023:2249 Released 2023-05-09 · Red Hat rating Moderate
    xorg-x11-server-Xwayland security update
    • Red Hat Enterprise Linux AppStream (v. 9) xorg-x11-server-Xwayland-21.1.3-7.el9
  • RHSA-2023:2248 Released 2023-05-09 · Red Hat rating Moderate
    xorg-x11-server security and bug fix update
    • Red Hat Enterprise Linux AppStream (v. 9) xorg-x11-server-1.20.11-17.el9, xorg-x11-server-Xdmx-1.20.11-17.el9, xorg-x11-server-Xephyr-1.20.11-17.el9 +4
    • Red Hat Enterprise Linux CRB (v. 9) xorg-x11-server-devel-1.20.11-17.el9, xorg-x11-server-source-1.20.11-17.el9
  • RHSA-2023:0675 Released 2023-02-08 · Red Hat rating Important
    tigervnc and xorg-x11-server security update
    • Red Hat Enterprise Linux Client (v. 7) tigervnc-1.8.0-24.el7_9, tigervnc-icons-1.8.0-24.el7_9, tigervnc-license-1.8.0-24.el7_9 +6
    • Red Hat Enterprise Linux Client Optional (v. 7) tigervnc-server-applet-1.8.0-24.el7_9, tigervnc-server-module-1.8.0-24.el7_9, xorg-x11-server-Xdmx-1.20.4-22.el7_9 +5
    • 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 +12
    • Red Hat Enterprise Linux Server (v. 7) tigervnc-1.8.0-24.el7_9, tigervnc-icons-1.8.0-24.el7_9, tigervnc-license-1.8.0-24.el7_9 +6
    • Red Hat Enterprise Linux Server Optional (v. 7) tigervnc-server-applet-1.8.0-24.el7_9, tigervnc-server-module-1.8.0-24.el7_9, xorg-x11-server-Xdmx-1.20.4-22.el7_9 +6
    • Red Hat Enterprise Linux Workstation (v. 7) tigervnc-1.8.0-24.el7_9, tigervnc-icons-1.8.0-24.el7_9, tigervnc-license-1.8.0-24.el7_9 +6
    • Red Hat Enterprise Linux Workstation Optional (v. 7) tigervnc-server-applet-1.8.0-24.el7_9, tigervnc-server-module-1.8.0-24.el7_9, xorg-x11-server-Xdmx-1.20.4-22.el7_9 +5
  • RHSA-2023:0671 Released 2023-02-08 · Red Hat rating Important
    tigervnc security update
    • 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-license-1.9.0-15.el8_2.1 +4
    • 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-license-1.9.0-15.el8_2.1 +4
    • 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-license-1.9.0-15.el8_2.1 +4
  • RHSA-2023:0663 Released 2023-02-08 · Red Hat rating Important
    tigervnc security update
    • 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-license-1.12.0-6.el8_6.1 +4
  • RHSA-2023:0662 Released 2023-02-08 · Red Hat rating Important
    tigervnc security update
    • Red Hat Enterprise Linux AppStream (v. 8) tigervnc-1.12.0-9.el8_7.1, tigervnc-icons-1.12.0-9.el8_7.1, tigervnc-license-1.12.0-9.el8_7.1 +4
  • RHSA-2023:0664 Released 2023-02-08 · Red Hat rating Important
    tigervnc security update
    • 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-license-1.11.0-8.el8_4.1 +4
  • RHSA-2023:0665 Released 2023-02-08 · Red Hat rating Important
    tigervnc security update
    • 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-license-1.9.0-16.el8_1.1 +4
  • RHSA-2023:0623 Released 2023-02-07 · Red Hat rating Important
    tigervnc security update
    • 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-license-1.11.0-22.el9_0.1 +4
  • RHSA-2023:0622 Released 2023-02-07 · Red Hat rating Important
    tigervnc security update
    • Red Hat Enterprise Linux AppStream (v. 9) tigervnc-1.12.0-5.el9_1.1, tigervnc-icons-1.12.0-5.el9_1.1, tigervnc-license-1.12.0-5.el9_1.1 +4

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2023:0662, RHSA-2023:2805, RHSA-2023:2806
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2023:0622, RHSA-2023:2248, RHSA-2023:2249
Red Hat Enterprise Linux AppStream AUS (v. 8.2)Fixed RHSA-2023:0671
Red Hat Enterprise Linux AppStream E4S (v. 8.1)Fixed RHSA-2023:0665
Red Hat Enterprise Linux AppStream E4S (v. 8.2)Fixed RHSA-2023:0671
Red Hat Enterprise Linux AppStream EUS (v.8.4)Fixed RHSA-2023:0664
Red Hat Enterprise Linux AppStream EUS (v.8.6)Fixed RHSA-2023:0663
Red Hat Enterprise Linux AppStream EUS (v.9.0)Fixed RHSA-2023:0623
Red Hat Enterprise Linux AppStream TUS (v. 8.2)Fixed RHSA-2023:0671
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2023:2806
Red Hat Enterprise Linux CRB (v. 9)Fixed RHSA-2023:2248
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2023:0675
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2023:0675
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2023:0675
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2023:0675
Red Hat Enterprise Linux Server -EXTENSION(v. 6 ELS-EXTENSION)Fixed RHSA-2025:12751
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2023:0675
Red Hat Enterprise Linux Server Optional -EXTENSION (v. 6 ELS -EXTENSION)Fixed RHSA-2025:12751
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2023:0675
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2023:0675

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-0494
  2. 2026-10-03 Alias added: GHSA-5v6x-2hpj-c37x

References

Patch 1

Advisory 3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences