high 7.8

CVE-2022-4283 json

A vulnerability was found in X.Org.

published 2022-12-14 3 y ago modified 2026-06-17 4 mo ago also EUVD-2022-51639

cvss: 7.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.1%; EPSS 1.1% chance of exploitation in 30 days, percentile 65%
public exploits: 0; none known

A vulnerability was found in X.Org. This security flaw occurs because the XkbCopyNames function left a dangling pointer to freed memory, resulting in out-of-bounds memory access on subsequent XkbGetKbdByName requests.. This issue can lead to local privileges elevation on systems where the X server is running privileged and remote code execution for ssh X forwarding sessions.

Patch / fix

distros 7

debian ubuntu red hat suse opensuse almalinux alpine

xwayland Debian 14, Debian 13, Debian 12 2:22.1.6-1
xorg-server Debian 14, Debian 13, Debian 12 2:21.1.5-1

debian advisories DEBIAN-CVE-2022-4283

xwayland Ubuntu 22.04 LTS 2:22.1.1-1ubuntu0.4
xorg-server Ubuntu 18.04 LTS 2:1.19.6-1ubuntu4.13
xorg-server Ubuntu 20.04 LTS 2:1.20.13-1ubuntu1~20.04.5
xorg-server Ubuntu 22.04 LTS 2:21.1.3-2ubuntu2.5
xorg-server-hwe-18.04 Ubuntu 18.04 LTS 2:1.20.8-2ubuntu2.2~18.04.9
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-2022-4283

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 8 1.12.0-15.el8_8
tigervnc-icons RHEL 8 1.12.0-15.el8_8
tigervnc-server RHEL 8 1.12.0-15.el8_8
tigervnc-license RHEL 8 1.12.0-15.el8_8
tigervnc-selinux RHEL 8 1.12.0-15.el8_8
tigervnc-server-module RHEL 8 1.12.0-15.el8_8
tigervnc-server-minimal RHEL 8 1.12.0-15.el8_8
xorg-x11-server RHEL 8 1.20.11-15.el8

red hat advisories RHSA-2025:12751 RHSA-2023:2830 RHSA-2023:2806 RHSA-2023:2805 RHSA-2023:2257 RHSA-2023:2248

xwayland SLE Workstation Extension 15 SP4, openSUSE Leap 15.4 21.1.4-150400.3.6.1
xorg-x11-server SLES 12 SP3-BCL, SLES 12 SP2-BCL 7.6_1.18.3-76.57.1
xorg-x11-server SLES for SAP 12 SP4, SLES 12 SP4-LTSS, OpenStack Cloud Crowbar 9 +1 more 1.19.6-4.39.1
xorg-x11-server SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 1.19.6-10.40.1
xorg-x11-server SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 1.19.6-150000.8.47.1
xorg-x11-server SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLES 15 SP1-BCL +3 more 1.20.3-150100.14.5.33.1
xorg-x11-server SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLES 15 SP2-BCL +12 more 1.20.3-150200.22.5.63.1
xorg-x11-server SLE Module for Development Tools 15 SP4, SLE Module for Basesystem 15 SP4, openSUSE Leap 15.4 1.20.3-150400.38.13.1

suse advisories SUSE-SU-2022:4487-1 SUSE-SU-2022:4485-1 SUSE-SU-2022:4484-1 SUSE-SU-2022:4483-1 SUSE-SU-2022:4482-1 SUSE-SU-2022:4481-1

xorg-x11-server openSUSE Tumbleweed 21.1.4-6.1
xwayland openSUSE Tumbleweed 22.1.5-2.1

opensuse advisories openSUSE-SU-2024:12569-1 openSUSE-SU-2024:12570-1

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-2023:2805 ALSA-2023:2806 ALSA-2023:2830 ALSA-2023:2248 ALSA-2023:2249 ALSA-2023:2257

xwayland Alpine 3.24, Alpine 3.23, Alpine 3.22 +5 more 22.1.6-r0
xorg-server Alpine 3.24, Alpine 3.23, Alpine 3.22 +5 more 21.1.5-r0

alpine advisories ALPINE-CVE-2022-4283

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-2022-4283 updated 2026-11-04 cvss 7.8

xorg-x11-server: XkbGetKbdByName use-after-free

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 1.12.0-15.el8_8, tigervnc-icons 1.12.0-15.el8_8, xorg-x11-server 1.20.11-15.el8, tigervnc-server 1.12.0-15.el8_8, tigervnc-license 1.12.0-15.el8_8, tigervnc-selinux 1.12.0-15.el8_8, +9 more
fixed: vendor fix RHSA-2023:2830
Red Hat Enterprise Linux AppStream (v. 9) tigervnc 1.12.0-13.el9_2, tigervnc-icons 1.12.0-13.el9_2, xorg-x11-server 1.20.11-17.el9, tigervnc-server 1.12.0-13.el9_2, tigervnc-license 1.12.0-13.el9_2, tigervnc-selinux 1.12.0-13.el9_2, +9 more
fixed: vendor fix RHSA-2023:2257
Red Hat Enterprise Linux Client (v. 7) tigervnc 1.8.0-23.el7_9, tigervnc-icons 1.8.0-23.el7_9, tigervnc-server 1.8.0-23.el7_9, tigervnc-license 1.8.0-23.el7_9, xorg-x11-server 1.20.4-21.el7_9, xorg-x11-server-Xorg 1.20.4-21.el7_9, +3 more Red Hat Enterprise Linux Client Optional (v. 7) xorg-x11-server-Xdmx 1.20.4-21.el7_9, xorg-x11-server-Xvfb 1.20.4-21.el7_9, tigervnc-server-applet 1.8.0-23.el7_9, tigervnc-server-module 1.8.0-23.el7_9, xorg-x11-server-Xnest 1.20.4-21.el7_9, xorg-x11-server-source 1.20.4-21.el7_9, +1 more Red Hat Enterprise Linux ComputeNode Optional (v. 7) tigervnc 1.8.0-23.el7_9, tigervnc-icons 1.8.0-23.el7_9, tigervnc-server 1.8.0-23.el7_9, xorg-x11-server 1.20.4-21.el7_9, xorg-x11-server-Xdmx 1.20.4-21.el7_9, xorg-x11-server-Xorg 1.20.4-21.el7_9, +8 more
fixed: vendor fix RHSA-2023:0045
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 1.8.0-23.el7_9, tigervnc-icons 1.8.0-23.el7_9, tigervnc-server 1.8.0-23.el7_9, tigervnc-license 1.8.0-23.el7_9, xorg-x11-server 1.20.4-21.el7_9, xorg-x11-server-Xorg 1.20.4-21.el7_9, +3 more
fixed: vendor fix RHSA-2023:0045

show 2 more

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 1.20.4-21.el7_9, xorg-x11-server-Xvfb 1.20.4-21.el7_9, tigervnc-server-applet 1.8.0-23.el7_9, tigervnc-server-module 1.8.0-23.el7_9, xorg-x11-server-Xnest 1.20.4-21.el7_9, xorg-x11-server-source 1.20.4-21.el7_9, +1 more Red Hat Enterprise Linux Workstation (v. 7) tigervnc 1.8.0-23.el7_9, tigervnc-icons 1.8.0-23.el7_9, tigervnc-server 1.8.0-23.el7_9, tigervnc-license 1.8.0-23.el7_9, xorg-x11-server 1.20.4-21.el7_9, xorg-x11-server-Xorg 1.20.4-21.el7_9, +3 more Red Hat Enterprise Linux Workstation Optional (v. 7) xorg-x11-server-Xdmx 1.20.4-21.el7_9, xorg-x11-server-Xvfb 1.20.4-21.el7_9, tigervnc-server-applet 1.8.0-23.el7_9, tigervnc-server-module 1.8.0-23.el7_9, xorg-x11-server-Xnest 1.20.4-21.el7_9, xorg-x11-server-source 1.20.4-21.el7_9, +1 more
fixed: vendor fix RHSA-2023:0045

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: 18 mo ago (2025-04-14)

Exploit prediction

1.08% chance of exploitation in the next 30 days, higher than 65% 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

CWE-416 Use After Free

References

lists.fedoraproject.org /archives/list/package-announce%40lists.fedoraproject.org/message/DXDF2O5PPLE3SVAJJYUOSAD5QZ4TWQ2G/
vendor-advisory, mailing-list, third-party-advisory
lists.fedoraproject.org /archives/list/package-announce%40lists.fedoraproject.org/message/5NELB7YDWRABYYBG4UPTHRBDTKJRV5M2/
vendor-advisory, mailing-list, third-party-advisory
debian.org /security/2022/dsa-5304
vendor-advisory, third-party-advisory
lists.fedoraproject.org /archives/list/package-announce%40lists.fedoraproject.org/message/Z67QC4C3I2FI2WRFIUPEHKC36J362MLA/
vendor-advisory, mailing-list, third-party-advisory
bugzilla.redhat.com /show_bug.cgi?id=2151761
issue-tracking, third-party-advisory
access.redhat.com /security/cve/CVE-2022-4283
third-party-advisory
security.gentoo.org /glsa/202305-30

Sources

CVE List CVE-2022-4283
NVD CVE-2022-4283

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.

Summary