RHSA-2026:84574
Vulnerability from csaf_redhat - Published: 2026-10-19 04:07 - Updated: 2026-10-19 04:38Summary
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: Arbitrary code execution via use-after-free in passive grab handling (CVE-2026-93516)
* xorg-x11-server: xorg-x11-server: arbitrary code execution via GLX RenderLarge heap-based buffer overflow (CVE-2026-93517)
* xorg-x11-server: xorg-x11-server: arbitrary code execution via integer truncation during keyboard mapping resize (CVE-2026-93518)
* xorg-x11-server: xorg-x11-server: Arbitrary code execution via buffer overflow in input_constrain_cursor() (CVE-2026-93519)
* xorg-x11-server: xorg-x11-server: arbitrary code execution via out-of-bounds write in XKB keycode handling (CVE-2026-93520)
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 xorg-x11-server. A local user can exploit a use-after-free condition—where the software attempts to access memory after it has been freed—by establishing a passive input grab and removing an input device. When subsequent input events are processed, the server dereferences the dangling device pointer. This flaw can lead to arbitrary code execution or a Denial of Service (DoS) via an X server crash.
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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.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_8.5.i686 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:xorg-x11-server-debuginfo-0:1.20.11-34.el9_8.5.ppc64le | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:xorg-x11-server-debuginfo-0:1.20.11-34.el9_8.5.s390x | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:xorg-x11-server-devel-0:1.20.11-34.el9_8.5.aarch64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:xorg-x11-server-source-0:1.20.11-34.el9_8.5.noarch | — |
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Threats
Impact
Important
A flaw was found in xorg-x11-server. The GLX (OpenGL Extension to the X Window System) interface fails to verify that incoming data sizes do not exceed allocated buffer limits when handling large rendering requests. An authenticated local client can exploit this vulnerability by sending a specially crafted request, triggering a heap-based buffer overflow. Successful exploitation can result in arbitrary code execution with the privileges of the X server or cause a Denial of Service (DoS) by crashing the application.
7.8 (High)
Affected products
Fixed
94 products, the same list as for
CVE-2026-93516
Threats
Impact
Moderate
A flaw was found in xorg-x11-server. Due to an integer truncation issue during memory allocation calculations within the X Keyboard Extension (XKB), the server allocates an undersized buffer when resizing key types. An authenticated local client can exploit this vulnerability by sending specially crafted XKB requests, causing a heap-based buffer overflow. This can result in arbitrary code execution or a denial of service (DoS).
7.8 (High)
Affected products
Fixed
94 products, the same list as for
CVE-2026-93516
Threats
Impact
Moderate
A flaw was found in xorg-x11-server. The server writes pointer barrier events into a fixed-size buffer without properly validating boundaries. An authenticated client can trigger this issue by configuring excessive pointer barriers and generating cursor motion events, causing a buffer overflow. This vulnerability may lead to arbitrary code execution or cause the server to crash, resulting in a Denial of Service (DoS).
7.8 (High)
Affected products
Fixed
94 products, the same list as for
CVE-2026-93516
Threats
Impact
Moderate
A flaw was found in xorg-x11-server. In the X Keyboard Extension (XKB), key name memory is allocated with an insufficient buffer size compared to the maximum supported range. An authenticated local client can exploit this flaw by sending requests that modify the keycode range, triggering a heap-based buffer overflow. This vulnerability can lead to arbitrary code execution 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-2026-93516
Threats
Impact
Moderate
References
28 references
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"text": "A flaw was found in xorg-x11-server. A local user can exploit a use-after-free condition\u2014where the software attempts to access memory after it has been freed\u2014by establishing a passive input grab and removing an input device. When subsequent input events are processed, the server dereferences the dangling device pointer. This flaw can lead to arbitrary code execution or a Denial of Service (DoS) via an X server crash.",
"title": "Vulnerability description"
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"text": "xorg-x11-server: xorg-x11-server: Arbitrary code execution via use-after-free in passive grab handling",
"title": "Vulnerability summary"
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{
"category": "other",
"text": "Red Hat rates this vulnerability as Important because an authenticated local user with access to an active X server session can trigger memory corruption, potentially leading to local privilege escalation or a denial of service. The flaw resides in how the X.Org server processes input device removal alongside passive grabs, leaving unmanaged device references that are dereferenced during subsequent pointer event handling. While default desktop configurations on modern Red Hat Enterprise Linux releases utilize Wayland sessions, environments running standalone Xorg server instances remain exposed.",
"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.",
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-93516"
},
{
"category": "external",
"summary": "RHBZ#2545161",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2545161"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-93516",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-93516"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-93516",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93516"
}
],
"release_date": "2026-10-07T12:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-10-19T04:07:45+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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"url": "https://access.redhat.com/errata/RHSA-2026:84574"
},
{
"category": "workaround",
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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: Arbitrary code execution via use-after-free in passive grab handling"
},
{
"cve": "CVE-2026-93517",
"cwe": {
"id": "CWE-120",
"name": "Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)"
},
"discovery_date": "2026-10-02T15:08:49.539000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2545246"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in xorg-x11-server. The GLX (OpenGL Extension to the X Window System) interface fails to verify that incoming data sizes do not exceed allocated buffer limits when handling large rendering requests. An authenticated local client can exploit this vulnerability by sending a specially crafted request, triggering a heap-based buffer overflow. Successful exploitation can result in arbitrary code execution with the privileges of the X server or cause a Denial of Service (DoS) by crashing the application.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "xorg-x11-server: xorg-x11-server: arbitrary code execution via GLX RenderLarge heap-based buffer overflow",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is rated as Moderate impact by Red Hat Product Security because exploitation is restricted to authenticated local users who have an active session connected to an X11 or Xwayland display server. Default headless and server installations of Red Hat Enterprise Linux do not run a graphical server and are inherently unexposed to this flaw. In workstation and desktop environments, the risk is bounded by the requirement of existing local client access, preventing remote or unauthenticated exploitation without prior compromise.",
"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-2026-93517"
},
{
"category": "external",
"summary": "RHBZ#2545246",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2545246"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-93517",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-93517"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-93517",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93517"
}
],
"release_date": "2026-10-07T12:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-10-19T04:07:45+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-2026:84574"
}
],
"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": "Moderate"
}
],
"title": "xorg-x11-server: xorg-x11-server: arbitrary code execution via GLX RenderLarge heap-based buffer overflow"
},
{
"cve": "CVE-2026-93518",
"cwe": {
"id": "CWE-787",
"name": "Out-of-bounds Write"
},
"discovery_date": "2026-10-05T09:42:21.686000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2545860"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in xorg-x11-server. Due to an integer truncation issue during memory allocation calculations within the X Keyboard Extension (XKB), the server allocates an undersized buffer when resizing key types. An authenticated local client can exploit this vulnerability by sending specially crafted XKB requests, causing a heap-based buffer overflow. This can result in arbitrary code execution or a denial of service (DoS).",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "xorg-x11-server: xorg-x11-server: arbitrary code execution via integer truncation during keyboard mapping resize",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Red Hat has evaluated this vulnerability as Moderate impact because exploitation requires an established, authenticated connection from a local client to the display server. While triggering the integer truncation during keyboard mapping reconfiguration can result in memory corruption or service termination, access is constrained to interactive user sessions. Headless server deployments that do not run graphical display services such as Xorg or Xwayland are not exposed to this risk.",
"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-2026-93518"
},
{
"category": "external",
"summary": "RHBZ#2545860",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2545860"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-93518",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-93518"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-93518",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93518"
}
],
"release_date": "2026-10-07T12:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-10-19T04:07:45+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-2026:84574"
}
],
"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": "Moderate"
}
],
"title": "xorg-x11-server: xorg-x11-server: arbitrary code execution via integer truncation during keyboard mapping resize"
},
{
"cve": "CVE-2026-93519",
"cwe": {
"id": "CWE-787",
"name": "Out-of-bounds Write"
},
"discovery_date": "2026-10-05T11:29:41.373000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2545887"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in xorg-x11-server. The server writes pointer barrier events into a fixed-size buffer without properly validating boundaries. An authenticated client can trigger this issue by configuring excessive pointer barriers and generating cursor motion events, causing a buffer overflow. This vulnerability may lead to arbitrary code execution or cause the server to crash, resulting in a Denial of Service (DoS).",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "xorg-x11-server: xorg-x11-server: Arbitrary code execution via buffer overflow in input_constrain_cursor()",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is evaluated as having a Moderate severity for Red Hat Enterprise Linux because exploitation is restricted to an authenticated local user with access to an active X11 display session, preventing remote exploitation. A local client can trigger memory corruption within the display server by defining a large number of cursor barriers and subsequently generating pointer movement. While this flaw can lead to a crash of the display server or potentially execute code within the context of the running X server process, the blast radius is confined to the local graphical user session.",
"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-2026-93519"
},
{
"category": "external",
"summary": "RHBZ#2545887",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2545887"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-93519",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-93519"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-93519",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93519"
}
],
"release_date": "2026-10-07T12:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-10-19T04:07:45+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-2026:84574"
}
],
"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": "Moderate"
}
],
"title": "xorg-x11-server: xorg-x11-server: Arbitrary code execution via buffer overflow in input_constrain_cursor()"
},
{
"cve": "CVE-2026-93520",
"cwe": {
"id": "CWE-787",
"name": "Out-of-bounds Write"
},
"discovery_date": "2026-10-05T12:53:29+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2545908"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in xorg-x11-server. In the X Keyboard Extension (XKB), key name memory is allocated with an insufficient buffer size compared to the maximum supported range. An authenticated local client can exploit this flaw by sending requests that modify the keycode range, triggering a heap-based buffer overflow. This vulnerability can lead to arbitrary code execution or cause a Denial of Service (DoS) by crashing the X server.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "xorg-x11-server: xorg-x11-server: arbitrary code execution via out-of-bounds write in XKB keycode handling",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is rated as having a Moderate severity for Red Hat Enterprise Linux because exploitation requires an established, authenticated connection from a client session to the local display server. Under typical enterprise deployments, Xorg and Xwayland do not listen for unauthenticated network traffic by default, restricting potential attacks to authenticated local users or forwarded sessions. Although a successful exploit may cause memory corruption leading to server crashes or arbitrary code execution within the privileges of the running display server, it cannot be triggered remotely by unauthenticated attackers.",
"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-2026-93520"
},
{
"category": "external",
"summary": "RHBZ#2545908",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2545908"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-93520",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-93520"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-93520",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93520"
}
],
"release_date": "2026-10-07T12:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-10-19T04:07:45+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-2026:84574"
}
],
"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": "Moderate"
}
],
"title": "xorg-x11-server: xorg-x11-server: arbitrary code execution via out-of-bounds write in XKB keycode handling"
}
]
}
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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
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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.