RHSA-2026:20558
Vulnerability from csaf_redhat - Published: 2026-05-26 04:06 - Updated: 2026-07-12 09:26Summary
Red Hat Security Advisory: xorg-x11-server security update
Severity
Important
Notes
Topic: An update for xorg-x11-server is now available for Red Hat Enterprise Linux 9.6 Extended Update Support.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: X.Org is an open-source implementation of the X Window System. It provides the basic low-level functionality that full-fledged graphical user interfaces are designed upon.
Security Fix(es):
* xorg: xwayland: X.Org X server: Denial of Service via integer underflow in XKB compatibility map handling (CVE-2026-33999)
* xwayland: xorg: X.Org X server: Information disclosure and denial of service via out-of-bounds read in XKB geometry processing. (CVE-2026-34000)
* xorg: xwayland: X.Org X server: Use-after-free vulnerability leads to server crash and potential memory corruption (CVE-2026-34001)
* xorg: xwayland: X.Org X server: Information disclosure or Denial of Service via out-of-bounds read in XKB modifier map handling (CVE-2026-34002)
* xorg: xwayland: X.Org X server: Information exposure and denial of service via out-of-bounds memory access (CVE-2026-34003)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in the X.Org X server. This integer underflow vulnerability, specifically in the XKB compatibility map handling, allows an attacker with local or remote X11 server access to trigger a buffer read overrun. This can lead to memory-safety violations and potentially a denial of service (DoS) or other severe impacts.
7.8 (High)
Affected products
Fixed
94 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-0:1.20.11-33.el9_6.src | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xdmx-0:1.20.11-33.el9_6.aarch64 | — |
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fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xdmx-0:1.20.11-33.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xdmx-0:1.20.11-33.el9_6.s390x | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xdmx-0:1.20.11-33.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xdmx-debuginfo-0:1.20.11-33.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xdmx-debuginfo-0:1.20.11-33.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xdmx-debuginfo-0:1.20.11-33.el9_6.s390x | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xdmx-debuginfo-0:1.20.11-33.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xephyr-0:1.20.11-33.el9_6.aarch64 | — |
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fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xephyr-0:1.20.11-33.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xephyr-0:1.20.11-33.el9_6.s390x | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xephyr-0:1.20.11-33.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xephyr-debuginfo-0:1.20.11-33.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xephyr-debuginfo-0:1.20.11-33.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xephyr-debuginfo-0:1.20.11-33.el9_6.s390x | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xephyr-debuginfo-0:1.20.11-33.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xnest-0:1.20.11-33.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xnest-0:1.20.11-33.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xnest-0:1.20.11-33.el9_6.s390x | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xnest-0:1.20.11-33.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xnest-debuginfo-0:1.20.11-33.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xnest-debuginfo-0:1.20.11-33.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xnest-debuginfo-0:1.20.11-33.el9_6.s390x | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xnest-debuginfo-0:1.20.11-33.el9_6.x86_64 | — |
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fix
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xorg-0:1.20.11-33.el9_6.aarch64 | — |
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fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xorg-0:1.20.11-33.el9_6.ppc64le | — |
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fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xorg-0:1.20.11-33.el9_6.s390x | — |
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fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xorg-0:1.20.11-33.el9_6.x86_64 | — |
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fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xorg-debuginfo-0:1.20.11-33.el9_6.aarch64 | — |
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fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xorg-debuginfo-0:1.20.11-33.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xorg-debuginfo-0:1.20.11-33.el9_6.s390x | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xorg-debuginfo-0:1.20.11-33.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xvfb-0:1.20.11-33.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xvfb-0:1.20.11-33.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xvfb-0:1.20.11-33.el9_6.s390x | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xvfb-0:1.20.11-33.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xvfb-debuginfo-0:1.20.11-33.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xvfb-debuginfo-0:1.20.11-33.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xvfb-debuginfo-0:1.20.11-33.el9_6.s390x | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-Xvfb-debuginfo-0:1.20.11-33.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-common-0:1.20.11-33.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-common-0:1.20.11-33.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-common-0:1.20.11-33.el9_6.s390x | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-common-0:1.20.11-33.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-debuginfo-0:1.20.11-33.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-debuginfo-0:1.20.11-33.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-debuginfo-0:1.20.11-33.el9_6.s390x | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-debuginfo-0:1.20.11-33.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-debugsource-0:1.20.11-33.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-debugsource-0:1.20.11-33.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-debugsource-0:1.20.11-33.el9_6.s390x | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-9.6.0.Z.EUS:xorg-x11-server-debugsource-0:1.20.11-33.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-Xdmx-debuginfo-0:1.20.11-33.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-Xdmx-debuginfo-0:1.20.11-33.el9_6.i686 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-Xdmx-debuginfo-0:1.20.11-33.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-Xdmx-debuginfo-0:1.20.11-33.el9_6.s390x | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-Xdmx-debuginfo-0:1.20.11-33.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-Xephyr-debuginfo-0:1.20.11-33.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-Xephyr-debuginfo-0:1.20.11-33.el9_6.i686 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-Xephyr-debuginfo-0:1.20.11-33.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-Xephyr-debuginfo-0:1.20.11-33.el9_6.s390x | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-Xephyr-debuginfo-0:1.20.11-33.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-Xnest-debuginfo-0:1.20.11-33.el9_6.aarch64 | — |
Vendor Fix
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Workaround
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-Xnest-debuginfo-0:1.20.11-33.el9_6.i686 | — |
Vendor Fix
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Workaround
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-Xnest-debuginfo-0:1.20.11-33.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-Xnest-debuginfo-0:1.20.11-33.el9_6.s390x | — |
Vendor Fix
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Workaround
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-Xnest-debuginfo-0:1.20.11-33.el9_6.x86_64 | — |
Vendor Fix
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-Xorg-debuginfo-0:1.20.11-33.el9_6.aarch64 | — |
Vendor Fix
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Workaround
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-Xorg-debuginfo-0:1.20.11-33.el9_6.i686 | — |
Vendor Fix
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Workaround
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-Xorg-debuginfo-0:1.20.11-33.el9_6.ppc64le | — |
Vendor Fix
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Workaround
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-Xorg-debuginfo-0:1.20.11-33.el9_6.s390x | — |
Vendor Fix
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-Xorg-debuginfo-0:1.20.11-33.el9_6.x86_64 | — |
Vendor Fix
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-Xvfb-debuginfo-0:1.20.11-33.el9_6.aarch64 | — |
Vendor Fix
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-Xvfb-debuginfo-0:1.20.11-33.el9_6.i686 | — |
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-Xvfb-debuginfo-0:1.20.11-33.el9_6.ppc64le | — |
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-Xvfb-debuginfo-0:1.20.11-33.el9_6.s390x | — |
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-Xvfb-debuginfo-0:1.20.11-33.el9_6.x86_64 | — |
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-debuginfo-0:1.20.11-33.el9_6.aarch64 | — |
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-debuginfo-0:1.20.11-33.el9_6.i686 | — |
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-debuginfo-0:1.20.11-33.el9_6.ppc64le | — |
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-debuginfo-0:1.20.11-33.el9_6.s390x | — |
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-debuginfo-0:1.20.11-33.el9_6.x86_64 | — |
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-debugsource-0:1.20.11-33.el9_6.aarch64 | — |
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-debugsource-0:1.20.11-33.el9_6.i686 | — |
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-debugsource-0:1.20.11-33.el9_6.ppc64le | — |
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-debugsource-0:1.20.11-33.el9_6.s390x | — |
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-debugsource-0:1.20.11-33.el9_6.x86_64 | — |
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-devel-0:1.20.11-33.el9_6.aarch64 | — |
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-devel-0:1.20.11-33.el9_6.i686 | — |
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-devel-0:1.20.11-33.el9_6.ppc64le | — |
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-devel-0:1.20.11-33.el9_6.s390x | — |
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-devel-0:1.20.11-33.el9_6.x86_64 | — |
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| Unresolved product id: CRB-9.6.0.Z.EUS:xorg-x11-server-source-0:1.20.11-33.el9_6.noarch | — |
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Threats
Impact
Important
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.
6.1 (Medium)
Affected products
Fixed
94 products, the same list as for
CVE-2026-33999
Threats
Impact
Moderate
A flaw was found in the X.Org X server. This use-after-free vulnerability occurs in the XSYNC fence triggering logic, specifically within the miSyncTriggerFence() function. An attacker with access to the X11 server can exploit this without user interaction, leading to a server crash and potentially enabling memory corruption. This could result in a denial of service or further compromise of the system.
7.8 (High)
Affected products
Fixed
94 products, the same list as for
CVE-2026-33999
Threats
Impact
Important
A flaw was found in the X.Org X server. This vulnerability, an out-of-bounds read, affects the XKB (X Keyboard Extension) modifier map handling. An attacker with access to the X11 server can exploit this by sending a malformed request, which causes the server to read beyond its intended memory boundaries. This can lead to the exposure of sensitive information or cause the server to crash, resulting in a denial of service.
6.1 (Medium)
Affected products
Fixed
94 products, the same list as for
CVE-2026-33999
Threats
Impact
Moderate
A flaw was found in the X.Org X server's XKB key types request validation. A local attacker could send a specially crafted request to the X server, leading to an out-of-bounds memory access vulnerability. This could result in the disclosure of sensitive information or cause the server to crash, leading to a Denial of Service (DoS). In certain configurations, higher impact outcomes may be possible.
7.8 (High)
Affected products
Fixed
94 products, the same list as for
CVE-2026-33999
Threats
Impact
Important
References
28 references
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"text": "An update for xorg-x11-server is now available for Red Hat Enterprise Linux 9.6 Extended Update Support.\n\nRed Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.",
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"text": "X.Org is an open-source implementation of the X Window System. It provides the basic low-level functionality that full-fledged graphical user interfaces are designed upon.\n\nSecurity Fix(es):\n\n* xorg: xwayland: X.Org X server: Denial of Service via integer underflow in XKB compatibility map handling (CVE-2026-33999)\n\n* xwayland: xorg: X.Org X server: Information disclosure and denial of service via out-of-bounds read in XKB geometry processing. (CVE-2026-34000)\n\n* xorg: xwayland: X.Org X server: Use-after-free vulnerability leads to server crash and potential memory corruption (CVE-2026-34001)\n\n* xorg: xwayland: X.Org X server: Information disclosure or Denial of Service via out-of-bounds read in XKB modifier map handling (CVE-2026-34002)\n\n* xorg: xwayland: X.Org X server: Information exposure and denial of service via out-of-bounds memory access (CVE-2026-34003)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
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"acknowledgments": [
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"names": [
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"ids": [
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"system_name": "Red Hat Bugzilla ID",
"text": "2451106"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the X.Org X server. This integer underflow vulnerability, specifically in the XKB compatibility map handling, allows an attacker with local or remote X11 server access to trigger a buffer read overrun. This can lead to memory-safety violations and potentially a denial of service (DoS) or other severe impacts.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "xorg: xwayland: X.Org X server: Denial of Service via integer underflow in XKB compatibility map handling",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "An Important integer underflow vulnerability exists in the X.Org X server\u0027s XKB compatibility map handling. This flaw allows an attacker with local or remote X11 server access to trigger a buffer read overrun, leading to memory-safety violations and potential denial of service. Red Hat Enterprise Linux systems utilizing the X.Org X server in graphical environments are affected.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-33999"
},
{
"category": "external",
"summary": "RHBZ#2451106",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2451106"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-33999",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-33999"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-33999",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33999"
}
],
"release_date": "2026-04-23T14:11:12.550000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-05-26T04:06:06+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:20558"
},
{
"category": "workaround",
"details": "To mitigate this issue, restrict access to the X11 server. For remote access, disable X11 forwarding in SSH configurations if not required. Edit `/etc/ssh/sshd_config` and set `X11Forwarding no`. After modifying the configuration, restart the `sshd` service using `systemctl restart sshd`. Disabling X11 forwarding may impact remote graphical applications.",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "xorg: xwayland: X.Org X server: Denial of Service via integer underflow in XKB compatibility map handling"
},
{
"acknowledgments": [
{
"names": [
"Jan-Niklas Sohn"
],
"organization": "TrendAI Zero Day Initiative"
}
],
"cve": "CVE-2026-34000",
"cwe": {
"id": "CWE-125",
"name": "Out-of-bounds Read"
},
"discovery_date": "2026-03-25T06:37:44.196979+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2451107"
}
],
"notes": [
{
"category": "description",
"text": "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.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "xwayland: xorg: X.Org X server: Information disclosure and denial of service via out-of-bounds read in XKB geometry processing.",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This out-of-bounds read vulnerability in the X.Org X server\u0027s XKB geometry processing could allow an attacker to leak memory contents or cause a denial of service. Exploitation requires an attacker to establish a connection to the X11 server, either locally or through forwarded remote sessions. Red Hat Enterprise Linux systems with a graphical environment enabled are potentially affected.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-34000"
},
{
"category": "external",
"summary": "RHBZ#2451107",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2451107"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-34000",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-34000"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-34000",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34000"
}
],
"release_date": "2026-05-05T14:01:15.690000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-05-26T04:06:06+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:20558"
},
{
"category": "workaround",
"details": "To mitigate this vulnerability, restrict access to the X11 server. On systems where a graphical environment is not required, consider disabling the X server entirely by setting the default system target to multi-user mode. For systems requiring the X server, ensure that X11 forwarding is disabled in SSH configurations if not explicitly needed, and restrict direct X11 connections to trusted users and networks through firewall rules. If changes are made to SSH configuration, the `sshd` service must be restarted. If the default system target is changed, a system reboot is required.",
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],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "LOW",
"baseScore": 6.1,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L",
"version": "3.1"
},
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],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "xwayland: xorg: X.Org X server: Information disclosure and denial of service via out-of-bounds read in XKB geometry processing."
},
{
"acknowledgments": [
{
"names": [
"Jan-Niklas Sohn"
],
"organization": "TrendAI Zero Day Initiative"
}
],
"cve": "CVE-2026-34001",
"cwe": {
"id": "CWE-825",
"name": "Expired Pointer Dereference"
},
"discovery_date": "2026-03-25T07:00:05.329048+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2451109"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the X.Org X server. This use-after-free vulnerability occurs in the XSYNC fence triggering logic, specifically within the miSyncTriggerFence() function. An attacker with access to the X11 server can exploit this without user interaction, leading to a server crash and potentially enabling memory corruption. This could result in a denial of service or further compromise of the system.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "xorg: xwayland: X.Org X server: Use-after-free vulnerability leads to server crash and potential memory corruption",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Important: This use-after-free vulnerability in the X.Org X server\u0027s XSYNC fence triggering logic can lead to a server crash and potential memory corruption. Exploitation requires an attacker to have access to the X11 server, typically limited to local users or trusted remote connections. Systems not running the X.Org X server are not affected.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-34001"
},
{
"category": "external",
"summary": "RHBZ#2451109",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2451109"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-34001",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-34001"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-34001",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34001"
}
],
"release_date": "2026-04-23T14:14:42.224000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-05-26T04:06:06+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:20558"
},
{
"category": "workaround",
"details": "To mitigate this issue, restrict access to the X11 server to trusted users and networks. If the X.Org X server is not required, consider disabling or uninstalling it. For environments where the X server is essential, running X applications within a sandboxed environment can help reduce the attack surface.",
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{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "xorg: xwayland: X.Org X server: Use-after-free vulnerability leads to server crash and potential memory corruption"
},
{
"acknowledgments": [
{
"names": [
"Jan-Niklas Sohn"
],
"organization": "TrendAI Zero Day Initiative"
}
],
"cve": "CVE-2026-34002",
"cwe": {
"id": "CWE-805",
"name": "Buffer Access with Incorrect Length Value"
},
"discovery_date": "2026-03-25T07:09:50.953449+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2451112"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the X.Org X server. This vulnerability, an out-of-bounds read, affects the XKB (X Keyboard Extension) modifier map handling. An attacker with access to the X11 server can exploit this by sending a malformed request, which causes the server to read beyond its intended memory boundaries. This can lead to the exposure of sensitive information or cause the server to crash, resulting in a denial of service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "xorg: xwayland: X.Org X server: Information disclosure or Denial of Service via out-of-bounds read in XKB modifier map handling",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Moderate: This out-of-bounds read vulnerability in the X.Org X server\u0027s XKB modifier map handling could lead to information disclosure or service crashes. An attacker with access to the X11 server can trigger this without user interaction. This affects systems running the X.Org X server.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-34002"
},
{
"category": "external",
"summary": "RHBZ#2451112",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2451112"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-34002",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-34002"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-34002",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34002"
}
],
"release_date": "2026-05-05T14:01:46.686000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-05-26T04:06:06+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:20558"
},
{
"category": "workaround",
"details": "To mitigate this vulnerability, restrict access to the X11 server. If the X.Org X server is not required on a system, consider disabling or uninstalling it. For systems where the X server is necessary, ensure that access is limited to trusted users and networks. This can involve configuring `xhost` or implementing firewall rules to restrict connections to the X server. Any changes to X server configuration or service status may require a restart of the X server for the mitigation to take effect, which will impact active graphical sessions.",
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}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "LOW",
"baseScore": 6.1,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L",
"version": "3.1"
},
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],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "xorg: xwayland: X.Org X server: Information disclosure or Denial of Service via out-of-bounds read in XKB modifier map handling"
},
{
"acknowledgments": [
{
"names": [
"Jan-Niklas Sohn"
],
"organization": "TrendAI Zero Day Initiative"
}
],
"cve": "CVE-2026-34003",
"cwe": {
"id": "CWE-125",
"name": "Out-of-bounds Read"
},
"discovery_date": "2026-03-25T07:19:13.949261+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2451113"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the X.Org X server\u0027s XKB key types request validation. A local attacker could send a specially crafted request to the X server, leading to an out-of-bounds memory access vulnerability. This could result in the disclosure of sensitive information or cause the server to crash, leading to a Denial of Service (DoS). In certain configurations, higher impact outcomes may be possible.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "xorg: xwayland: X.Org X server: Information exposure and denial of service via out-of-bounds memory access",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "An Important out-of-bounds memory access vulnerability exists in the X.Org X server\u0027s XKB key types request validation. This flaw could lead to information exposure or a server crash and requires a specially crafted request to trigger. Systems running a graphical environment are potentially affected, with higher impact outcomes possible in certain configurations.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-34003"
},
{
"category": "external",
"summary": "RHBZ#2451113",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2451113"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-34003",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-34003"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-34003",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34003"
}
],
"release_date": "2026-04-23T14:18:00.653000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-05-26T04:06:06+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:20558"
},
{
"category": "workaround",
"details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.",
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}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "xorg: xwayland: X.Org X server: Information exposure and denial of service via out-of-bounds memory access"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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