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Fencer Vulns
high 7.0

CVE-2023-5574 json

Xorg-x11-server: use-after-free bug in damagedestroy

published 2023-10-25 3 y ago modified 2026-11-04 4 d ago also EUVD-2023-57870

cvss
7.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 49%
public exploits
0
none known

Summary

A use-after-free flaw was found in xorg-x11-server-Xvfb. This issue occurs in Xvfb with a very specific and legacy configuration (a multi-screen setup with multiple protocol screens, also known as Zaphod mode). If the pointer is warped from a screen 1 to a screen 0, a use-after-free issue may be triggered during shutdown or reset of the Xvfb server, allowing for possible escalation of privileges or denial of service.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 9 0:1.13.1-8.el9
  • tigervnc RHEL 9 1.13.1-8.el9
  • tigervnc-icons RHEL 9 1.13.1-8.el9
  • tigervnc-server RHEL 9 1.13.1-8.el9
  • tigervnc-license RHEL 9 1.13.1-8.el9
  • tigervnc-selinux RHEL 9 1.13.1-8.el9
  • tigervnc-server-module RHEL 9 1.13.1-8.el9
  • tigervnc-server-minimal RHEL 9 1.13.1-8.el9

red hat advisories RHSA-2024:2298

  • xorg-x11-server SLES for SAP 15 SP3, SLES for SAP 15 SP2, SLES 15 SP3-LTSS +10 more 1.20.3-150200.22.5.79.1
  • xwayland SLE Workstation Extension 15 SP5, openSUSE Leap 15.5 22.1.5-150500.7.5.1
  • xwayland SLE Workstation Extension 15 SP4, openSUSE Leap 15.4 21.1.4-150400.3.20.1
  • xorg-x11-server SLE Module for Development Tools 15 SP4, SLE Module for Basesystem 15 SP4, openSUSE Leap 15.4 1.20.3-150400.38.29.1
  • xorg-x11-server SLE Module for Development Tools 15 SP5, SLE Module for Basesystem 15 SP5, openSUSE Leap 15.5 21.1.4-150500.7.7.1
  • xorg-x11-server SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 1.19.6-10.56.1

suse advisories SUSE-SU-2023:4338-1SUSE-SU-2023:4306-1SUSE-SU-2023:4293-1SUSE-SU-2023:4292-1SUSE-SU-2023:4272-1SUSE-SU-2023:4269-1

  • xorg-x11-server openSUSE Tumbleweed 21.1.9-1.1
  • xwayland openSUSE Tumbleweed 23.2.2-2.1

opensuse advisories openSUSE-SU-2024:13361-1openSUSE-SU-2024:13467-1

  • tigervnc AlmaLinux 9 1.13.1-8.el9
  • tigervnc-icons AlmaLinux 9 1.13.1-8.el9
  • tigervnc-server AlmaLinux 9 1.13.1-8.el9
  • tigervnc-license AlmaLinux 9 1.13.1-8.el9
  • tigervnc-selinux AlmaLinux 9 1.13.1-8.el9
  • tigervnc-server-module AlmaLinux 9 1.13.1-8.el9
  • tigervnc-server-minimal AlmaLinux 9 1.13.1-8.el9

almalinux advisories ALSA-2024:2298

  • xorg-server Alpine 3.24, Alpine 3.23, Alpine 3.22 +4 more 21.1.9-r0

alpine advisories ALPINE-CVE-2023-5574

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 1.20.10-10

azure linux advisories AZL-31703

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-2023-5574 updated cvss 7.0

xorg-x11-server: Use-after-free bug in DamageDestroy

  • 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 Red Hat Enterprise Linux 7 xorg-x11-server, xorg-x11-server-Xdmx, xorg-x11-server-Xorg, xorg-x11-server-Xvfb, xorg-x11-server-Xnest, xorg-x11-server-common, +3 more Red Hat Enterprise Linux 8 xorg-x11-server, xorg-x11-server-Xdmx, xorg-x11-server-Xorg, xorg-x11-server-Xvfb, xorg-x11-server-Xnest, xorg-x11-server-common, +3 more Red Hat Enterprise Linux 9 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 “Starting Xvfb with the -noreset command line option limits the use-after-free from being triggered only at the Xvfb server shutdown. Also, do not start Xvfb as root.”
  • Red Hat Enterprise Linux AppStream (v. 9) tigervnc 1.13.1-8.el9, tigervnc-icons 1.13.1-8.el9, tigervnc-server 1.13.1-8.el9, tigervnc-license 1.13.1-8.el9, tigervnc-selinux 1.13.1-8.el9, tigervnc-server-module 1.13.1-8.el9, +1 more
    fixed: vendor fix “Starting Xvfb with the -noreset command line option limits the use-after-free from being triggered only at the Xvfb server shutdown. Also, do not start Xvfb as root.” RHSA-2024:2298
  • Red Hat Enterprise Linux 6 tigervnc, tigervnc-server, tigervnc-server-applet, tigervnc-server-module Red Hat Enterprise Linux 7 tigervnc, tigervnc-icons, tigervnc-server, tigervnc-license, tigervnc-server-applet, tigervnc-server-module, +1 more Red Hat Enterprise Linux 8 tigervnc, tigervnc-icons, tigervnc-server, tigervnc-license, tigervnc-selinux, tigervnc-server-applet, +3 more Red Hat Enterprise Linux 9 xorg-x11-server-Xwayland
    not affected: vulnerable code not present

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
no
Technical impact
total
Assessed
17 mo ago

Exploit prediction

0.61% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8

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.