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Fencer Vulns
high 7.6

CVE-2023-6478 json

Xorg-x11-server: out-of-bounds memory read in rrchangeoutputproperty and rrchangeproviderproperty

published 2023-12-13 2 y ago modified 2026-11-04 4 d ago also EUVD-2023-58711

cvss
7.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.6%
EPSS 1.6% chance of exploitation in 30 days, percentile 76%
public exploits
0
none known

Summary

A flaw was found in xorg-server. A specially crafted request to RRChangeProviderProperty or RRChangeOutputProperty can trigger an integer overflow which may lead to a disclosure of sensitive information.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION 0:1.1.0-25.el6_10.13
  • Red Hat Red Hat Enterprise Linux 7 0:1.8.0-28.el7_9, 0:1.20.4-25.el7_9
  • Red Hat Red Hat Enterprise Linux 8 0:1.13.1-2.el8_9.4, 0:1.20.11-22.el8, 0:21.1.3-15.el8
  • Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support 0:1.9.0-15.el8_2.6
  • Red Hat Red Hat Enterprise Linux 8.2 Telecommunications Update Service 0:1.9.0-15.el8_2.6
  • Red Hat Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions 0:1.9.0-15.el8_2.6
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:1.11.0-8.el8_4.5
  • Red Hat Red Hat Enterprise Linux 8.4 Telecommunications Update Service 0:1.11.0-8.el8_4.5
  • Red Hat Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions 0:1.11.0-8.el8_4.5
  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support 0:1.12.0-6.el8_6.6
  • Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support 0:1.12.0-15.el8_8.4
  • Red Hat Red Hat Enterprise Linux 9 0:1.13.1-3.el9_3.3, 0:1.20.11-24.el9, 0:22.1.9-5.el9
  • Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support 0:1.11.0-22.el9_0.5
  • Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support 0:1.12.0-14.el9_2.2
  • xwayland Debian 14, Debian 13 2:23.2.3-1
  • xorg-server Debian 12 2:21.1.7-3+deb12u3
  • xorg-server Debian 14, Debian 13 2:21.1.10-1

debian advisories DEBIAN-CVE-2023-6478

  • xwayland Ubuntu 22.04 LTS 2:22.1.1-1ubuntu0.9
  • xorg-server Ubuntu 20.04 LTS 2:1.20.13-1ubuntu1~20.04.12
  • xorg-server Ubuntu 22.04 LTS 2:21.1.4-2ubuntu1.7~22.04.5
  • xorg-server Ubuntu 24.04 LTS 2:21.1.10-1ubuntu1
  • xorg-server Ubuntu Pro 14.04 LTS 2:1.15.1-0ubuntu2.11+esm9
  • xorg-server Ubuntu Pro 16.04 LTS 2:1.18.4-0ubuntu0.12+esm8
  • xorg-server Ubuntu Pro 18.04 LTS 2:1.19.6-1ubuntu4.15+esm3

ubuntu advisories UBUNTU-CVE-2023-6478

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

  • xorg-x11-server-Xwayland RHEL 8 21.1.3-15.el8
  • xorg-x11-server RHEL 8 1.20.11-22.el8
  • xorg-x11-server-Xdmx RHEL 8 1.20.11-22.el8
  • xorg-x11-server-Xorg RHEL 8 1.20.11-22.el8
  • xorg-x11-server-Xvfb RHEL 8 1.20.11-22.el8
  • xorg-x11-server-Xnest RHEL 8 1.20.11-22.el8
  • xorg-x11-server-common RHEL 8 1.20.11-22.el8
  • xorg-x11-server-source RHEL 8 1.20.11-22.el8

red hat advisories RHSA-2025:12751RHSA-2024:2996RHSA-2024:2995RHSA-2024:2170RHSA-2024:2169RHSA-2024:0016

  • xwayland SLE Workstation Extension 15 SP4, openSUSE Leap 15.4 21.1.4-150400.3.23.1
  • xorg-x11-server SLE Module for Development Tools 15 SP4, SLE Module for Basesystem 15 SP4, openSUSE Leap 15.4 1.20.3-150400.38.32.1
  • xorg-x11-server SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 1.19.6-10.59.1
  • xorg-x11-server SLES for SAP 15 SP3, SLES for SAP 15 SP2, SLES 15 SP3-LTSS +8 more 1.20.3-150200.22.5.82.1
  • xwayland SLE Workstation Extension 15 SP5, openSUSE Leap 15.5 22.1.5-150500.7.8.1
  • xorg-x11-server SLE Module for Development Tools 15 SP5, SLE Module for Basesystem 15 SP5, openSUSE Leap 15.5 21.1.4-150500.7.10.1

suse advisories SUSE-SU-2023:4792-1SUSE-SU-2023:4791-1SUSE-SU-2023:4790-1SUSE-SU-2023:4789-1SUSE-SU-2023:4788-1SUSE-SU-2023:4787-1

  • xorg-x11-server openSUSE Tumbleweed 21.1.9-2.1
  • xwayland openSUSE Tumbleweed 23.2.2-3.1

opensuse advisories openSUSE-SU-2024:13512-1openSUSE-SU-2024:13513-1

  • xorg-x11-server-Xdmx AlmaLinux 8 1.20.11-22.el8
  • xorg-x11-server-Xorg AlmaLinux 8 1.20.11-22.el8
  • xorg-x11-server-Xvfb AlmaLinux 8 1.20.11-22.el8
  • xorg-x11-server-Xnest AlmaLinux 8 1.20.11-22.el8
  • xorg-x11-server-common AlmaLinux 8 1.20.11-22.el8
  • xorg-x11-server-source AlmaLinux 8 1.20.11-22.el8
  • xorg-x11-server-Xephyr AlmaLinux 8 1.20.11-22.el8
  • xorg-x11-server-Xwayland AlmaLinux 8 21.1.3-15.el8

almalinux advisories ALSA-2024:2995ALSA-2024:2996ALSA-2024:2169ALSA-2024:2170ALSA-2024:0010ALSA-2024:0018

  • xorg-server Alpine 3.24, Alpine 3.23, Alpine 3.22 +4 more 21.1.10-r0

alpine advisories ALPINE-CVE-2023-6478

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

  • xorg-x11-server CBL-Mariner 2.0 1.20.10-5

azure linux advisories AZL-32180

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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-2023-6478 updated cvss 7.6

xorg-x11-server: out-of-bounds memory read in RRChangeOutputProperty and RRChangeProviderProperty

  • 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: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) tigervnc 1.13.1-2.el8_9.4, xorg-x11-server 1.20.11-22.el8, tigervnc-icons 1.13.1-2.el8_9.4, tigervnc-server 1.13.1-2.el8_9.4, tigervnc-license 1.13.1-2.el8_9.4, tigervnc-selinux 1.13.1-2.el8_9.4, +9 more
    fixed: vendor fix RHSA-2024:2995
  • Red Hat Enterprise Linux AppStream (v. 9) tigervnc 1.13.1-3.el9_3.3, xorg-x11-server 1.20.11-24.el9, tigervnc-icons 1.13.1-3.el9_3.3, tigervnc-server 1.13.1-3.el9_3.3, tigervnc-license 1.13.1-3.el9_3.3, tigervnc-selinux 1.13.1-3.el9_3.3, +9 more
    fixed: vendor fix RHSA-2024:0010
  • Red Hat Enterprise Linux AppStream AUS (v. 8.2) tigervnc 1.9.0-15.el8_2.6, tigervnc-icons 1.9.0-15.el8_2.6, tigervnc-server 1.9.0-15.el8_2.6, tigervnc-license 1.9.0-15.el8_2.6, tigervnc-server-applet 1.9.0-15.el8_2.6, tigervnc-server-module 1.9.0-15.el8_2.6, +1 more
    fixed: vendor fix RHSA-2024:0017
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) tigervnc 1.11.0-8.el8_4.5, tigervnc-icons 1.11.0-8.el8_4.5, tigervnc-server 1.11.0-8.el8_4.5, tigervnc-license 1.11.0-8.el8_4.5, tigervnc-selinux 1.11.0-8.el8_4.5, tigervnc-server-module 1.11.0-8.el8_4.5, +1 more
    fixed: vendor fix RHSA-2024:0016
  • Red Hat Enterprise Linux AppStream E4S (v. 8.2) tigervnc 1.9.0-15.el8_2.6, tigervnc-icons 1.9.0-15.el8_2.6, tigervnc-server 1.9.0-15.el8_2.6, tigervnc-license 1.9.0-15.el8_2.6, tigervnc-server-applet 1.9.0-15.el8_2.6, tigervnc-server-module 1.9.0-15.el8_2.6, +1 more
    fixed: vendor fix RHSA-2024:0017
  • Red Hat Enterprise Linux AppStream E4S (v.8.4) tigervnc 1.11.0-8.el8_4.5, tigervnc-icons 1.11.0-8.el8_4.5, tigervnc-server 1.11.0-8.el8_4.5, tigervnc-license 1.11.0-8.el8_4.5, tigervnc-selinux 1.11.0-8.el8_4.5, tigervnc-server-module 1.11.0-8.el8_4.5, +1 more
    fixed: vendor fix RHSA-2024:0016
  • Red Hat Enterprise Linux AppStream EUS (v.8.6) tigervnc 1.12.0-6.el8_6.6, tigervnc-icons 1.12.0-6.el8_6.6, tigervnc-server 1.12.0-6.el8_6.6, tigervnc-license 1.12.0-6.el8_6.6, tigervnc-selinux 1.12.0-6.el8_6.6, tigervnc-server-module 1.12.0-6.el8_6.6, +1 more
    fixed: vendor fix RHSA-2024:0015
show 12 more
  • Red Hat Enterprise Linux AppStream EUS (v.8.8) tigervnc 1.12.0-15.el8_8.4, tigervnc-icons 1.12.0-15.el8_8.4, tigervnc-server 1.12.0-15.el8_8.4, tigervnc-license 1.12.0-15.el8_8.4, tigervnc-selinux 1.12.0-15.el8_8.4, tigervnc-server-module 1.12.0-15.el8_8.4, +1 more
    fixed: vendor fix RHSA-2024:0014
  • Red Hat Enterprise Linux AppStream EUS (v.9.0) tigervnc 1.11.0-22.el9_0.5, tigervnc-icons 1.11.0-22.el9_0.5, tigervnc-server 1.11.0-22.el9_0.5, tigervnc-license 1.11.0-22.el9_0.5, tigervnc-selinux 1.11.0-22.el9_0.5, tigervnc-server-module 1.11.0-22.el9_0.5, +1 more
    fixed: vendor fix RHSA-2024:0020
  • Red Hat Enterprise Linux AppStream EUS (v.9.2) tigervnc 1.12.0-14.el9_2.2, tigervnc-icons 1.12.0-14.el9_2.2, tigervnc-server 1.12.0-14.el9_2.2, tigervnc-license 1.12.0-14.el9_2.2, tigervnc-selinux 1.12.0-14.el9_2.2, tigervnc-server-module 1.12.0-14.el9_2.2, +1 more
    fixed: vendor fix RHSA-2023:7886
  • Red Hat Enterprise Linux AppStream TUS (v. 8.2) tigervnc 1.9.0-15.el8_2.6, tigervnc-icons 1.9.0-15.el8_2.6, tigervnc-server 1.9.0-15.el8_2.6, tigervnc-license 1.9.0-15.el8_2.6, tigervnc-server-applet 1.9.0-15.el8_2.6, tigervnc-server-module 1.9.0-15.el8_2.6, +1 more
    fixed: vendor fix RHSA-2024:0017
  • Red Hat Enterprise Linux AppStream TUS (v.8.4) tigervnc 1.11.0-8.el8_4.5, tigervnc-icons 1.11.0-8.el8_4.5, tigervnc-server 1.11.0-8.el8_4.5, tigervnc-license 1.11.0-8.el8_4.5, tigervnc-selinux 1.11.0-8.el8_4.5, tigervnc-server-module 1.11.0-8.el8_4.5, +1 more
    fixed: vendor fix RHSA-2024:0016
  • Red Hat Enterprise Linux Client (v. 7) tigervnc 1.8.0-28.el7_9, tigervnc-icons 1.8.0-28.el7_9, tigervnc-server 1.8.0-28.el7_9, tigervnc-license 1.8.0-28.el7_9, xorg-x11-server 1.20.4-25.el7_9, xorg-x11-server-Xorg 1.20.4-25.el7_9, +3 more Red Hat Enterprise Linux Client Optional (v. 7) xorg-x11-server-Xdmx 1.20.4-25.el7_9, xorg-x11-server-Xvfb 1.20.4-25.el7_9, tigervnc-server-applet 1.8.0-28.el7_9, tigervnc-server-module 1.8.0-28.el7_9, xorg-x11-server-Xnest 1.20.4-25.el7_9, xorg-x11-server-source 1.20.4-25.el7_9, +1 more Red Hat Enterprise Linux ComputeNode Optional (v. 7) tigervnc 1.8.0-28.el7_9, tigervnc-icons 1.8.0-28.el7_9, tigervnc-server 1.8.0-28.el7_9, xorg-x11-server 1.20.4-25.el7_9, xorg-x11-server-Xdmx 1.20.4-25.el7_9, xorg-x11-server-Xorg 1.20.4-25.el7_9, +8 more
    fixed: vendor fix RHSA-2024:0006
  • Red Hat Enterprise Linux CRB (v. 8) xorg-x11-server-source 1.20.11-22.el8
    fixed: vendor fix RHSA-2024:2995
  • Red Hat Enterprise Linux CRB (v. 9) xorg-x11-server-source 1.20.11-24.el9
    fixed: vendor fix RHSA-2024:2169
  • 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 1.8.0-28.el7_9, tigervnc-icons 1.8.0-28.el7_9, tigervnc-server 1.8.0-28.el7_9, tigervnc-license 1.8.0-28.el7_9, xorg-x11-server 1.20.4-25.el7_9, xorg-x11-server-Xorg 1.20.4-25.el7_9, +3 more
    fixed: vendor fix RHSA-2024:0006
  • 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 1.20.4-25.el7_9, xorg-x11-server-Xvfb 1.20.4-25.el7_9, tigervnc-server-applet 1.8.0-28.el7_9, tigervnc-server-module 1.8.0-28.el7_9, xorg-x11-server-Xnest 1.20.4-25.el7_9, xorg-x11-server-source 1.20.4-25.el7_9, +1 more Red Hat Enterprise Linux Workstation (v. 7) tigervnc 1.8.0-28.el7_9, tigervnc-icons 1.8.0-28.el7_9, tigervnc-server 1.8.0-28.el7_9, tigervnc-license 1.8.0-28.el7_9, xorg-x11-server 1.20.4-25.el7_9, xorg-x11-server-Xorg 1.20.4-25.el7_9, +3 more Red Hat Enterprise Linux Workstation Optional (v. 7) xorg-x11-server-Xdmx 1.20.4-25.el7_9, xorg-x11-server-Xvfb 1.20.4-25.el7_9, tigervnc-server-applet 1.8.0-28.el7_9, tigervnc-server-module 1.8.0-28.el7_9, xorg-x11-server-Xnest 1.20.4-25.el7_9, xorg-x11-server-source 1.20.4-25.el7_9, +1 more
    fixed: vendor fix RHSA-2024:0006

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 SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
2 y ago

Exploit prediction

1.62% chance of exploitation in the next 30 days, higher than 76% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.6 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

  • Red Hat Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support
  • Red Hat Red Hat Enterprise Linux 8.2 Telecommunications Update Service
  • Red Hat Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.4 Telecommunications Update Service
  • Red Hat Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 6

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound

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.