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Fencer Vulns
medium 6.1

CVE-2026-34000 json

Xwayland: xorg: x.org x server: information disclosure and denial of service via out-of-bounds read in xkb geometry processing.

published 2026-05-05 6 mo ago modified 2026-11-05 3 d ago also EUVD-2026-27341

cvss
6.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 42%
public exploits
0
none known

Summary

A flaw was found in the X.Org X server. This out-of-bounds read vulnerability in the XKB geometry processing, specifically within the `CheckSetGeom()` and `XkbAddGeomKeyAlias` functions, allows an attacker to read uninitialized or out-of-bounds memory. An attacker with a connection to the X11 server, either locally or remotely, can exploit this without user interaction. This could lead to the disclosure of memory contents or cause a denial of service by crashing the server.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:24.1.5-6.el10_0
  • Red Hat Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION 0:1.1.0-25.el6_10.16
  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:1.8.0-36.el7_9.4, 0:1.20.4-34.el7_9
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:1.11.0-8.el8_4.15, 0:1.20.10-4.el8_4
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 0:1.11.0-8.el8_4.15, 0:1.20.10-4.el8_4
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:1.12.0-6.el8_6.17, 0:1.20.11-7.el8_6, 0:21.1.3-2.el8_6.6
  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 0:1.12.0-6.el8_6.17
  • Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service 0:1.20.11-7.el8_6, 0:21.1.3-2.el8_6.6
  • Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions 0:1.20.11-7.el8_6, 0:21.1.3-2.el8_6.6
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:1.12.0-15.el8_8.17, 0:1.20.11-18.el8_8, 0:21.1.3-13.el8_8
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:1.12.0-15.el8_8.17, 0:1.20.11-18.el8_8, 0:21.1.3-13.el8_8
  • Red Hat Red Hat Enterprise Linux 9 0:1.15.0-7.el9_8.1
  • Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions 0:1.11.0-22.el9_0.17, 0:1.20.11-13.el9_0, 0:21.1.3-5.el9_0
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:1.12.0-14.el9_2.14, 0:1.20.11-20.el9_2, 0:21.1.3-10.el9_2
  • Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support 0:1.13.1-8.el9_4.9, 0:1.20.11-28.el9_4, 0:22.1.9-8.el9_4
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:1.14.1-10.el9_6, 0:1.20.11-33.el9_6, 0:23.2.7-6.el9_6
  • xwayland Debian 14 2:24.1.10-1
  • xorg-server Debian 12 2:21.1.7-3+deb12u12
  • xorg-server Debian 13 2:21.1.16-1.3+deb13u2
  • xorg-server Debian 14 2:21.1.22-1

debian advisories DEBIAN-CVE-2026-34000

  • tigervnc RHEL 9 1.15.0-7.el9_8.1
  • tigervnc-icons RHEL 9 1.15.0-7.el9_8.1
  • tigervnc-server RHEL 9 1.15.0-7.el9_8.1
  • tigervnc-license RHEL 9 1.15.0-7.el9_8.1
  • tigervnc-selinux RHEL 9 1.15.0-7.el9_8.1
  • tigervnc-server-module RHEL 9 1.15.0-7.el9_8.1
  • tigervnc-server-minimal RHEL 9 1.15.0-7.el9_8.1
  • tigervnc RHEL 8.6 EUS_LONG_LIFE, RHEL 8.6 AUS 1.12.0-6.el8_6.17

red hat advisories RHSA-2026:24341RHSA-2026:23496RHSA-2026:23254RHSA-2026:23255RHSA-2026:22456RHSA-2026:22424

  • xwayland SLES for SAP applications 16.0, SLES 16.0 24.1.6-160000.4.1
  • xorg-x11-server SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE High Performance Computing 15 SP5-LTSS +1 more 21.1.4-150500.7.46.1
  • xorg-x11-server SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS +1 more 1.20.3-150400.38.68.1
  • xorg-x11-server SLES for SAP 15 SP6, SLES 15 SP6-LTSS, openSUSE Leap 15.6 21.1.11-150600.5.25.1
  • xorg-x11-server SLE Module for Development Tools 15 SP7, SLE Module for Basesystem 15 SP7 21.1.15-150700.5.16.1
  • xwayland openSUSE Leap 15.6 24.1.1-150600.5.23.1
  • xwayland SLE Workstation Extension 15 SP7 24.1.5-150700.3.14.1
  • xorg-x11-server SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 1.19.6-10.99.1

suse advisories SUSE-SU-2026:21211-1SUSE-SU-2026:1335-1SUSE-SU-2026:1333-1SUSE-SU-2026:1332-1SUSE-SU-2026:1331-1SUSE-SU-2026:1330-1

  • xwayland openSUSE Leap 16.0 24.1.6-160000.4.1
  • xorg-x11-server openSUSE Leap 16.0 21.1.15-160000.4.1
  • xorg-x11-server openSUSE Tumbleweed 21.1.21-5.1
  • xwayland openSUSE Tumbleweed 24.1.9-2.1

opensuse advisories openSUSE-SU-2026:20560-1openSUSE-SU-2026:20544-1openSUSE-SU-2026:10556-1openSUSE-SU-2026:10557-1

  • tigervnc AlmaLinux 9 1.15.0-7.el9_8.1
  • tigervnc-icons AlmaLinux 9 1.15.0-7.el9_8.1
  • tigervnc-server AlmaLinux 9 1.15.0-7.el9_8.1
  • tigervnc-license AlmaLinux 9 1.15.0-7.el9_8.1
  • tigervnc-selinux AlmaLinux 9 1.15.0-7.el9_8.1
  • tigervnc-server-module AlmaLinux 9 1.15.0-7.el9_8.1
  • tigervnc-server-minimal AlmaLinux 9 1.15.0-7.el9_8.1

almalinux advisories ALSA-2026:19342

  • tigervnc Rocky Linux 9 1.15.0-7.el9_8.1

rocky linux advisories RLSA-2026:19342

  • xwayland Alpine 3.24, Alpine 3.23 24.1.10-r0
  • xorg-server Alpine 3.24, Alpine 3.23 21.1.22-r0

alpine advisories ALPINE-CVE-2026-34000

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-2026-34000 updated cvss 6.1

xwayland: xorg: X.Org X server: Information disclosure and denial of service via out-of-bounds read in XKB geometry processing.

  • 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 8 tigervnc, tigervnc-icons, tigervnc-server, xorg-x11-server, tigervnc-license, tigervnc-selinux, +11 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, +3 more Red Hat Enterprise Linux 10 xorg-x11-server-Xwayland
    affected: workaround, no fix available
  • Red Hat CodeReady Linux Builder EUS (v.9.4) xorg-x11-server-source 1.20.11-28.el9_4
    fixed: vendor fix RHSA-2026:20555
  • Red Hat CodeReady Linux Builder EUS (v.9.6) xorg-x11-server-source 1.20.11-33.el9_6, xorg-x11-server-Xwayland 23.2.7-6.el9_6
    fixed: vendor fix RHSA-2026:20558
  • Red Hat Enterprise Linux AppStream (v. 9) tigervnc 1.15.0-7.el9_8.1, tigervnc-icons 1.15.0-7.el9_8.1, tigervnc-server 1.15.0-7.el9_8.1, tigervnc-license 1.15.0-7.el9_8.1, tigervnc-selinux 1.15.0-7.el9_8.1, tigervnc-server-module 1.15.0-7.el9_8.1, +1 more
    fixed: vendor fix RHSA-2026:19342
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) tigervnc 1.11.0-8.el8_4.15, xorg-x11-server 1.20.10-4.el8_4, tigervnc-icons 1.11.0-8.el8_4.15, tigervnc-server 1.11.0-8.el8_4.15, tigervnc-license 1.11.0-8.el8_4.15, tigervnc-selinux 1.11.0-8.el8_4.15, +9 more
    fixed: vendor fix RHSA-2026:23254
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) tigervnc 1.12.0-6.el8_6.17, xorg-x11-server 1.20.11-7.el8_6, tigervnc-icons 1.12.0-6.el8_6.17, tigervnc-server 1.12.0-6.el8_6.17, tigervnc-license 1.12.0-6.el8_6.17, tigervnc-selinux 1.12.0-6.el8_6.17, +9 more
    fixed: vendor fix RHSA-2026:24341
  • Red Hat Enterprise Linux AppStream E4S (v.8.6) xorg-x11-server 1.20.11-7.el8_6, xorg-x11-server-Xdmx 1.20.11-7.el8_6, xorg-x11-server-Xorg 1.20.11-7.el8_6, xorg-x11-server-Xvfb 1.20.11-7.el8_6, xorg-x11-server-Xnest 1.20.11-7.el8_6, xorg-x11-server-common 1.20.11-7.el8_6, +2 more
    fixed: vendor fix RHSA-2026:21718
show 15 more
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) tigervnc 1.12.0-15.el8_8.17, xorg-x11-server 1.20.11-18.el8_8, tigervnc-icons 1.12.0-15.el8_8.17, tigervnc-server 1.12.0-15.el8_8.17, tigervnc-license 1.12.0-15.el8_8.17, tigervnc-selinux 1.12.0-15.el8_8.17, +9 more
    fixed: vendor fix RHSA-2026:23255
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) tigervnc 1.11.0-22.el9_0.17, xorg-x11-server 1.20.11-13.el9_0, tigervnc-icons 1.11.0-22.el9_0.17, tigervnc-server 1.11.0-22.el9_0.17, tigervnc-license 1.11.0-22.el9_0.17, tigervnc-selinux 1.11.0-22.el9_0.17, +9 more
    fixed: vendor fix RHSA-2026:21741
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) tigervnc 1.12.0-14.el9_2.14, xorg-x11-server 1.20.11-20.el9_2, tigervnc-icons 1.12.0-14.el9_2.14, tigervnc-server 1.12.0-14.el9_2.14, tigervnc-license 1.12.0-14.el9_2.14, tigervnc-selinux 1.12.0-14.el9_2.14, +9 more
    fixed: vendor fix RHSA-2026:20576
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) xorg-x11-server-Xwayland 24.1.5-6.el10_0
    fixed: vendor fix RHSA-2026:20563
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) tigervnc 1.13.1-8.el9_4.9, tigervnc-icons 1.13.1-8.el9_4.9, tigervnc-server 1.13.1-8.el9_4.9, xorg-x11-server 1.20.11-28.el9_4, tigervnc-license 1.13.1-8.el9_4.9, tigervnc-selinux 1.13.1-8.el9_4.9, +9 more
    fixed: vendor fix RHSA-2026:20575
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) tigervnc 1.14.1-10.el9_6, tigervnc-icons 1.14.1-10.el9_6, tigervnc-server 1.14.1-10.el9_6, tigervnc-license 1.14.1-10.el9_6, tigervnc-selinux 1.14.1-10.el9_6, xorg-x11-server 1.20.11-33.el9_6, +9 more
    fixed: vendor fix RHSA-2026:22424
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) tigervnc 1.11.0-8.el8_4.15, xorg-x11-server 1.20.10-4.el8_4, tigervnc-icons 1.11.0-8.el8_4.15, tigervnc-server 1.11.0-8.el8_4.15, tigervnc-license 1.11.0-8.el8_4.15, tigervnc-selinux 1.11.0-8.el8_4.15, +9 more
    fixed: vendor fix RHSA-2026:23254
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) tigervnc 1.12.0-6.el8_6.17, tigervnc-icons 1.12.0-6.el8_6.17, tigervnc-server 1.12.0-6.el8_6.17, tigervnc-license 1.12.0-6.el8_6.17, tigervnc-selinux 1.12.0-6.el8_6.17, tigervnc-server-module 1.12.0-6.el8_6.17, +1 more
    fixed: vendor fix RHSA-2026:24341
  • Red Hat Enterprise Linux AppStream TUS (v.8.6) xorg-x11-server 1.20.11-7.el8_6, xorg-x11-server-Xdmx 1.20.11-7.el8_6, xorg-x11-server-Xorg 1.20.11-7.el8_6, xorg-x11-server-Xvfb 1.20.11-7.el8_6, xorg-x11-server-Xnest 1.20.11-7.el8_6, xorg-x11-server-common 1.20.11-7.el8_6, +2 more
    fixed: vendor fix RHSA-2026:21718
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) tigervnc 1.12.0-15.el8_8.17, xorg-x11-server 1.20.11-18.el8_8, tigervnc-icons 1.12.0-15.el8_8.17, tigervnc-server 1.12.0-15.el8_8.17, tigervnc-license 1.12.0-15.el8_8.17, tigervnc-selinux 1.12.0-15.el8_8.17, +9 more
    fixed: vendor fix RHSA-2026:23255
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) xorg-x11-server-Xwayland-devel 24.1.5-6.el10_0, xorg-x11-server-Xwayland-debuginfo 24.1.5-6.el10_0, xorg-x11-server-Xwayland-debugsource 24.1.5-6.el10_0
    fixed: vendor fix RHSA-2026:20563
  • Red Hat Enterprise Linux Server -EXTENSION(v. 6 ELS-EXTENSION) tigervnc 1.1.0-25.el6_10.16, tigervnc-server 1.1.0-25.el6_10.16
    fixed: vendor fix RHSA-2026:23496
  • Red Hat Enterprise Linux Server (v. 7 ELS) tigervnc 1.8.0-36.el7_9.4, tigervnc-icons 1.8.0-36.el7_9.4, xorg-x11-server 1.20.4-34.el7_9, tigervnc-server 1.8.0-36.el7_9.4, tigervnc-license 1.8.0-36.el7_9.4, xorg-x11-server-Xorg 1.20.4-34.el7_9, +3 more
    fixed: vendor fix RHSA-2026:22456
  • Red Hat Enterprise Linux Server Optional -EXTENSION (v. 6 ELS -EXTENSION) tigervnc-server-applet 1.1.0-25.el6_10.16, tigervnc-server-module 1.1.0-25.el6_10.16
    fixed: vendor fix RHSA-2026:23496
  • Red Hat Enterprise Linux Server Optional (v. 7 ELS) xorg-x11-server-Xdmx 1.20.4-34.el7_9, xorg-x11-server-Xvfb 1.20.4-34.el7_9, xorg-x11-server-Xnest 1.20.4-34.el7_9, xorg-x11-server-source 1.20.4-34.el7_9, tigervnc-server-applet 1.8.0-36.el7_9.4, tigervnc-server-module 1.8.0-36.el7_9.4, +1 more
    fixed: vendor fix RHSA-2026:22456

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
partial
Assessed
6 mo ago

Exploit prediction

0.49% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L
NVD 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION
  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
  • Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service
  • Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 6
  • 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.

CPEs and fixed versions use Anchore's correction of NVD's data: NVD has unbounded range and is missing some components and upstream advisory urls.