CVE-2026-34000

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

State: Published
Severity: 6.1 Medium
Published: May 5, 2026
Updated: Jun 8, 2026
Reserved: Mar 25, 2026

Read the record on cve.org

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.

Scores

CVSS	Score	Vector	Source
3.1	6.1 Medium	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L	redhat

Weaknesses

CWE-125 Out-of-bounds Read

Affected Products

Product	Versions
Red Hat Enterprise Linux 10.0 Extended Update SupportRed Hat	0:24.1.5-6.el10_0 and laterNot affected
Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSIONRed Hat	0:1.1.0-25.el6_10.16 and laterNot affected
Red Hat Enterprise Linux 7 Extended Lifecycle SupportRed Hat	0:1.20.4-34.el7_9 and laterNot affected
Red Hat Enterprise Linux 7 Extended Lifecycle SupportRed Hat	0:1.8.0-36.el7_9.4 and laterNot affected
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRed Hat	0:1.20.10-4.el8_4 and laterNot affected
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRed Hat	0:1.11.0-8.el8_4.15 and laterNot affected
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRed Hat	0:1.20.10-4.el8_4 and laterNot affected
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRed Hat	0:1.11.0-8.el8_4.15 and laterNot affected
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRed Hat	0:21.1.3-2.el8_6.6 and laterNot affected
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRed Hat	0:1.20.11-7.el8_6 and laterNot affected
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRed Hat	0:1.12.0-6.el8_6.17 and laterNot affected
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnRed Hat	0:1.12.0-6.el8_6.17 and laterNot affected
Red Hat Enterprise Linux 8.6 Telecommunications Update ServiceRed Hat	0:21.1.3-2.el8_6.6 and laterNot affected
Red Hat Enterprise Linux 8.6 Telecommunications Update ServiceRed Hat	0:1.20.11-7.el8_6 and laterNot affected
Red Hat Enterprise Linux 8.6 Update Services for SAP SolutionsRed Hat	0:21.1.3-2.el8_6.6 and laterNot affected
Red Hat Enterprise Linux 8.6 Update Services for SAP SolutionsRed Hat	0:1.20.11-7.el8_6 and laterNot affected
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRed Hat	0:21.1.3-13.el8_8 and laterNot affected
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRed Hat	0:1.20.11-18.el8_8 and laterNot affected
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRed Hat	0:1.12.0-15.el8_8.17 and laterNot affected
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRed Hat	0:21.1.3-13.el8_8 and laterNot affected
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRed Hat	0:1.20.11-18.el8_8 and laterNot affected
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRed Hat	0:1.12.0-15.el8_8.17 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:1.15.0-7.el9_8.1 and laterNot affected
Red Hat Enterprise Linux 9.0 Update Services for SAP SolutionsRed Hat	0:21.1.3-5.el9_0 and laterNot affected
Red Hat Enterprise Linux 9.0 Update Services for SAP SolutionsRed Hat	0:1.20.11-13.el9_0 and laterNot affected
Red Hat Enterprise Linux 9.0 Update Services for SAP SolutionsRed Hat	0:1.11.0-22.el9_0.17 and laterNot affected
Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRed Hat	0:21.1.3-10.el9_2 and laterNot affected
Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRed Hat	0:1.20.11-20.el9_2 and laterNot affected
Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRed Hat	0:1.12.0-14.el9_2.14 and laterNot affected
Red Hat Enterprise Linux 9.4 Extended Update SupportRed Hat	0:1.20.11-28.el9_4 and laterNot affected
Red Hat Enterprise Linux 9.4 Extended Update SupportRed Hat	0:22.1.9-8.el9_4 and laterNot affected
Red Hat Enterprise Linux 9.4 Extended Update SupportRed Hat	0:1.13.1-8.el9_4.9 and laterNot affected
Red Hat Enterprise Linux 9.6 Extended Update SupportRed Hat	0:1.20.11-33.el9_6 and laterNot affected
Red Hat Enterprise Linux 9.6 Extended Update SupportRed Hat	0:23.2.7-6.el9_6 and laterNot affected
Red Hat Enterprise Linux 9.6 Extended Update SupportRed Hat	0:1.14.1-10.el9_6 and laterNot affected
Red Hat Enterprise Linux 10Red Hat
Red Hat Enterprise Linux 6Red Hat
Red Hat Enterprise Linux 8Red Hat
Red Hat Enterprise Linux 8Red Hat
Red Hat Enterprise Linux 8Red Hat
Red Hat Enterprise Linux 9Red Hat
Red Hat Enterprise Linux 9Red Hat

References

RHSA-2026:19342vendor-advisory
RHSA-2026:20547vendor-advisory
RHSA-2026:20555vendor-advisory
RHSA-2026:20557vendor-advisory
RHSA-2026:20558vendor-advisory
RHSA-2026:20560vendor-advisory
RHSA-2026:20561vendor-advisory
RHSA-2026:20562vendor-advisory
RHSA-2026:20563vendor-advisory
RHSA-2026:20575vendor-advisory
RHSA-2026:20576vendor-advisory
RHSA-2026:20590vendor-advisory
RHSA-2026:21699vendor-advisory
RHSA-2026:21712vendor-advisory
RHSA-2026:21715vendor-advisory
RHSA-2026:21716vendor-advisory
RHSA-2026:21718vendor-advisory
RHSA-2026:21741vendor-advisory
RHSA-2026:21742vendor-advisory
RHSA-2026:22424vendor-advisory
RHSA-2026:22456vendor-advisory
RHSA-2026:23254vendor-advisory
RHSA-2026:23255vendor-advisory
RHSA-2026:23496vendor-advisory
RHSA-2026:24341vendor-advisory
https://access.redhat.com/security/cve/CVE-2026-34000vdb-entry
RHBZ#2451107issue-tracking

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