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Vulnerability · Published May 5, 2026 · Assigned by redhat

CVE-2026-34000Xwayland: xorg: x.org x server: information disclosure and denial of service via out-of-bounds read in xkb geometry processing.

Medium 6.1

In plain English

A medium-severity out-of-bounds read in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.1Medium
Exploit odds (30 days)0.5%top 57.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:9tigervnc1.15.0-7.el9_8.1ALSA-2026:19342
AlmaLinux:9tigervnc-icons1.15.0-7.el9_8.1ALSA-2026:19342
AlmaLinux:9tigervnc-license1.15.0-7.el9_8.1ALSA-2026:19342
AlmaLinux:9tigervnc-selinux1.15.0-7.el9_8.1ALSA-2026:19342
AlmaLinux:9tigervnc-server1.15.0-7.el9_8.1ALSA-2026:19342
AlmaLinux:9tigervnc-server-minimal1.15.0-7.el9_8.1ALSA-2026:19342
AlmaLinux:9tigervnc-server-module1.15.0-7.el9_8.1ALSA-2026:19342
Alpine:v3.23xorg-server21.1.22-r0ALPINE-CVE-2026-34000
Alpine:v3.24xorg-server21.1.22-r0ALPINE-CVE-2026-34000
Alpine:v3.23xwayland24.1.10-r0ALPINE-CVE-2026-34000
Alpine:v3.24xwayland24.1.10-r0ALPINE-CVE-2026-34000
Debian:12xorg-server2:21.1.7-3+deb12u12DEBIAN-CVE-2026-34000
Debian:13xorg-server2:21.1.16-1.3+deb13u2DEBIAN-CVE-2026-34000
Debian:14xorg-server2:21.1.22-1DEBIAN-CVE-2026-34000
Debian:12xwaylandno fix listedDEBIAN-CVE-2026-34000
Debian:13xwaylandno fix listedDEBIAN-CVE-2026-34000
Debian:14xwayland2:24.1.10-1DEBIAN-CVE-2026-34000
Rocky Linux:9tigervnc0:1.15.0-7.el9_8.1RLSA-2026:19342
Ubuntu:22.04:LTSxorg-serverno fix listedUBUNTU-CVE-2026-34000
Ubuntu:24.04:LTSxorg-serverno fix listedUBUNTU-CVE-2026-34000
Ubuntu:25.10xorg-serverno fix listedUBUNTU-CVE-2026-34000
Ubuntu:26.04:LTSxorg-serverno fix listedUBUNTU-CVE-2026-34000
Ubuntu:22.04:LTSxwaylandno fix listedUBUNTU-CVE-2026-34000
Ubuntu:24.04:LTSxwaylandno fix listedUBUNTU-CVE-2026-34000
Ubuntu:25.10xwaylandno fix listedUBUNTU-CVE-2026-34000
Ubuntu:26.04:LTSxwaylandno fix listedUBUNTU-CVE-2026-34000

Affected products (as reported)

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

Weakness: CWE-125 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L

References