RHSA-2026:82015
Vulnerability from csaf_opensuse - Published: 2026-10-13 06:14 - Updated: 2026-10-29 14:57Summary
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.
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-x11-server: xorg-x11-server: Privilege escalation via crafted RandR provider property requests (CVE-2026-93521)
* xorg-x11-server: xwayland: xorg-x11-server: Arbitrary code execution via double-free in XKB geometry handling (CVE-2026-88812)
* xorg-x11-server: xorg-x11-server: Out-of-bounds write via unvalidated modifier in ProcXIPassiveUngrabDevice (CVE-2026-93523)
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 and XWayland. An error handling issue in the X Keyboard Extension (XKB) geometry processing fails to clear a memory pointer after an allocation failure, leading to a double-free condition during cleanup. A local user can exploit this vulnerability by sending a specially crafted request to the display server. This can cause memory corruption, potentially resulting in a Denial of Service (DoS) or arbitrary code execution with elevated privileges.
7.8 (High)
Affected products
Fixed
94 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-0:1.20.11-34.el9_8.4.src | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xdmx-0:1.20.11-34.el9_8.4.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xdmx-0:1.20.11-34.el9_8.4.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xdmx-0:1.20.11-34.el9_8.4.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xdmx-0:1.20.11-34.el9_8.4.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xdmx-debuginfo-0:1.20.11-34.el9_8.4.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xdmx-debuginfo-0:1.20.11-34.el9_8.4.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xdmx-debuginfo-0:1.20.11-34.el9_8.4.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xdmx-debuginfo-0:1.20.11-34.el9_8.4.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xephyr-0:1.20.11-34.el9_8.4.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xephyr-0:1.20.11-34.el9_8.4.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xephyr-0:1.20.11-34.el9_8.4.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xephyr-0:1.20.11-34.el9_8.4.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xephyr-debuginfo-0:1.20.11-34.el9_8.4.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xephyr-debuginfo-0:1.20.11-34.el9_8.4.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xephyr-debuginfo-0:1.20.11-34.el9_8.4.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xephyr-debuginfo-0:1.20.11-34.el9_8.4.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xnest-0:1.20.11-34.el9_8.4.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xnest-0:1.20.11-34.el9_8.4.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xnest-0:1.20.11-34.el9_8.4.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xnest-0:1.20.11-34.el9_8.4.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xnest-debuginfo-0:1.20.11-34.el9_8.4.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xnest-debuginfo-0:1.20.11-34.el9_8.4.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xnest-debuginfo-0:1.20.11-34.el9_8.4.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xnest-debuginfo-0:1.20.11-34.el9_8.4.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xorg-0:1.20.11-34.el9_8.4.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xorg-0:1.20.11-34.el9_8.4.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xorg-0:1.20.11-34.el9_8.4.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xorg-0:1.20.11-34.el9_8.4.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xorg-debuginfo-0:1.20.11-34.el9_8.4.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xorg-debuginfo-0:1.20.11-34.el9_8.4.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xorg-debuginfo-0:1.20.11-34.el9_8.4.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xorg-debuginfo-0:1.20.11-34.el9_8.4.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xvfb-0:1.20.11-34.el9_8.4.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xvfb-0:1.20.11-34.el9_8.4.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xvfb-0:1.20.11-34.el9_8.4.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xvfb-0:1.20.11-34.el9_8.4.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xvfb-debuginfo-0:1.20.11-34.el9_8.4.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xvfb-debuginfo-0:1.20.11-34.el9_8.4.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xvfb-debuginfo-0:1.20.11-34.el9_8.4.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xvfb-debuginfo-0:1.20.11-34.el9_8.4.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-common-0:1.20.11-34.el9_8.4.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-common-0:1.20.11-34.el9_8.4.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-common-0:1.20.11-34.el9_8.4.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-common-0:1.20.11-34.el9_8.4.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-debuginfo-0:1.20.11-34.el9_8.4.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-debuginfo-0:1.20.11-34.el9_8.4.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-debuginfo-0:1.20.11-34.el9_8.4.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-debuginfo-0:1.20.11-34.el9_8.4.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-debugsource-0:1.20.11-34.el9_8.4.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-debugsource-0:1.20.11-34.el9_8.4.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-debugsource-0:1.20.11-34.el9_8.4.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:xorg-x11-server-debugsource-0:1.20.11-34.el9_8.4.x86_64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xdmx-debuginfo-0:1.20.11-34.el9_8.4.aarch64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xdmx-debuginfo-0:1.20.11-34.el9_8.4.i686 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xdmx-debuginfo-0:1.20.11-34.el9_8.4.ppc64le | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xdmx-debuginfo-0:1.20.11-34.el9_8.4.s390x | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xdmx-debuginfo-0:1.20.11-34.el9_8.4.x86_64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xephyr-debuginfo-0:1.20.11-34.el9_8.4.aarch64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xephyr-debuginfo-0:1.20.11-34.el9_8.4.i686 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xephyr-debuginfo-0:1.20.11-34.el9_8.4.ppc64le | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xephyr-debuginfo-0:1.20.11-34.el9_8.4.s390x | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xephyr-debuginfo-0:1.20.11-34.el9_8.4.x86_64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xnest-debuginfo-0:1.20.11-34.el9_8.4.aarch64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xnest-debuginfo-0:1.20.11-34.el9_8.4.i686 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xnest-debuginfo-0:1.20.11-34.el9_8.4.ppc64le | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xnest-debuginfo-0:1.20.11-34.el9_8.4.s390x | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xnest-debuginfo-0:1.20.11-34.el9_8.4.x86_64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xorg-debuginfo-0:1.20.11-34.el9_8.4.aarch64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xorg-debuginfo-0:1.20.11-34.el9_8.4.i686 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xorg-debuginfo-0:1.20.11-34.el9_8.4.ppc64le | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xorg-debuginfo-0:1.20.11-34.el9_8.4.s390x | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xorg-debuginfo-0:1.20.11-34.el9_8.4.x86_64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xvfb-debuginfo-0:1.20.11-34.el9_8.4.aarch64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xvfb-debuginfo-0:1.20.11-34.el9_8.4.i686 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xvfb-debuginfo-0:1.20.11-34.el9_8.4.ppc64le | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xvfb-debuginfo-0:1.20.11-34.el9_8.4.s390x | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:xorg-x11-server-Xvfb-debuginfo-0:1.20.11-34.el9_8.4.x86_64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:xorg-x11-server-debuginfo-0:1.20.11-34.el9_8.4.aarch64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:xorg-x11-server-debuginfo-0:1.20.11-34.el9_8.4.i686 | — |
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Threats
Impact
Important
A flaw was found in xorg-x11-server. The X server incorrectly calculates buffer sizes and memory offsets when prepending or appending data to RandR (Resize and Rotate extension) provider properties. A local attacker can exploit this vulnerability by sending specially crafted property update requests, causing memory corruption. This flaw could allow an attacker to escalate privileges or cause a denial of service (DoS) by crashing the X server.
7.8 (High)
Affected products
Fixed
94 products, the same list as for
CVE-2026-88812
Threats
Impact
Important
A flaw was found in xorg-x11-server. A local authenticated client can exploit this flaw by sending a crafted input device ungrab request with an unvalidated modifier value. This lack of validation causes the server to perform an out-of-bounds write on the heap, resulting in memory corruption that can lead to a denial of service (DoS) or potential arbitrary code execution.
7.8 (High)
Affected products
Fixed
94 products, the same list as for
CVE-2026-88812
Threats
Impact
Important
References
18 references
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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-x11-server: xorg-x11-server: Privilege escalation via crafted RandR provider property requests (CVE-2026-93521)\n\n* xorg-x11-server: xwayland: xorg-x11-server: Arbitrary code execution via double-free in XKB geometry handling (CVE-2026-88812)\n\n* xorg-x11-server: xorg-x11-server: Out-of-bounds write via unvalidated modifier in ProcXIPassiveUngrabDevice (CVE-2026-93523)\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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"text": "A flaw was found in the X.Org X Server and XWayland. An error handling issue in the X Keyboard Extension (XKB) geometry processing fails to clear a memory pointer after an allocation failure, leading to a double-free condition during cleanup. A local user can exploit this vulnerability by sending a specially crafted request to the display server. This can cause memory corruption, potentially resulting in a Denial of Service (DoS) or arbitrary code execution with elevated privileges.",
"title": "Vulnerability description"
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"text": "xorg-x11-server: xwayland: xorg-x11-server: Arbitrary code execution via double-free in XKB geometry handling",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is rated as Important because an authenticated local user able to connect to the X server or Xwayland display can trigger memory corruption, potentially leading to arbitrary code execution or privilege escalation with the privileges of the running display server. In typical Red Hat Enterprise Linux workstation and desktop environments, the X server or Xwayland runs as part of the user session, limiting the blast radius, though legacy configurations or privileged Xorg deployments could allow full local privilege escalation. Environments running headless servers without active graphical sessions or X11 forwarding are not exposed to this issue.",
"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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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-88812"
},
{
"category": "external",
"summary": "RHBZ#2545174",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2545174"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-88812",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-88812"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-88812",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-88812"
}
],
"release_date": "2026-10-07T12:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-10-13T06:14:04+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-2026:82015"
},
{
"category": "workaround",
"details": "On server systems where a graphical desktop interface is not required, exposure can be mitigated by disabling the graphical display manager or removing optional X11/Xwayland packages.\n\nTo disable the graphical interface and boot into text mode:\n```\nsystemctl set-default multi-user.target\nsystemctl isolate multi-user.target\n```\n\nAlternatively, remove the affected packages if graphical sessions are not utilized:\n```\ndnf remove xorg-x11-server-Xorg xorg-x11-server-Xwayland\n```\n\nCaveats:\nRemoving these packages or switching system targets will disable graphical login, may remove GNOME and related desktop packages via package manager dependencies, and will break graphical desktop functionality. The server will remain fully accessible and usable via local console terminals and remote SSH sessions.\n\nWarning: Executing these commands will immediately terminate all active graphical sessions.",
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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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{
"category": "impact",
"details": "Important"
}
],
"title": "xorg-x11-server: xwayland: xorg-x11-server: Arbitrary code execution via double-free in XKB geometry handling"
},
{
"cve": "CVE-2026-93521",
"cwe": {
"id": "CWE-787",
"name": "Out-of-bounds Write"
},
"discovery_date": "2026-10-02T12:53:42.872000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2545164"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in xorg-x11-server. The X server incorrectly calculates buffer sizes and memory offsets when prepending or appending data to RandR (Resize and Rotate extension) provider properties. A local attacker can exploit this vulnerability by sending specially crafted property update requests, causing memory corruption. This flaw could allow an attacker to escalate privileges or cause a denial of service (DoS) by crashing the X server.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "xorg-x11-server: xorg-x11-server: Privilege escalation via crafted RandR provider property requests",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is rated as an Important severity flaw because an authenticated local client can trigger memory corruption within the X server to crash the display server or potentially execute arbitrary code with elevated privileges. In Red Hat Enterprise Linux environments, modern desktop sessions default to Wayland, which restricts direct exposure to Xwayland compatibility instances. However, systems actively utilizing traditional Xorg sessions remain exposed to local privilege escalation by any authorized user with access to the X display.",
"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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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-93521"
},
{
"category": "external",
"summary": "RHBZ#2545164",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2545164"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-93521",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-93521"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-93521",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93521"
}
],
"release_date": "2026-10-07T12:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-10-13T06:14:04+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-2026:82015"
},
{
"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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{
"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-x11-server: xorg-x11-server: Privilege escalation via crafted RandR provider property requests"
},
{
"cve": "CVE-2026-93523",
"cwe": {
"id": "CWE-787",
"name": "Out-of-bounds Write"
},
"discovery_date": "2026-10-02T13:01:36.069000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2545177"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in xorg-x11-server. A local authenticated client can exploit this flaw by sending a crafted input device ungrab request with an unvalidated modifier value. This lack of validation causes the server to perform an out-of-bounds write on the heap, resulting in memory corruption that can lead to a denial of service (DoS) or potential arbitrary code execution.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "xorg-x11-server: xorg-x11-server: Out-of-bounds write via unvalidated modifier in ProcXIPassiveUngrabDevice",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is rated as Important severity because an authenticated local client can trigger heap memory corruption, which may allow local privilege escalation if the display server operates with administrative privileges or cause a denial of service by terminating the session. In standard Red Hat Enterprise Linux deployments using Wayland, the root impact is reduced as XWayland runs within an unprivileged user session; however, legacy Xorg server configurations running as root remain susceptible to full privilege escalation. Headless server installations that do not run graphical display environments are not exposed to this flaw.",
"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-2026-93523"
},
{
"category": "external",
"summary": "RHBZ#2545177",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2545177"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-93523",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-93523"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-93523",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93523"
}
],
"release_date": "2026-10-07T12:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-10-13T06:14:04+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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"category": "none"
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"url": "https://access.redhat.com/errata/RHSA-2026:82015"
},
{
"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-x11-server: xorg-x11-server: Out-of-bounds write via unvalidated modifier in ProcXIPassiveUngrabDevice"
}
]
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.