RHSA-2026:82015HighCVSS 7.8

Red Hat Security Advisory: xorg-x11-server security update

Published
October 13, 2026
Last Modified
October 29, 2026

🔗 CVE IDs covered (3)

CVE-2026-88812 →CVE-2026-93521 →CVE-2026-93523 →

📋 Description

CVE-2026-88812 — xorg-x11-server: xwayland: xorg-x11-server: Arbitrary code execution via double-free in XKB geometry handling CVE-2026-93521 — xorg-x11-server: xorg-x11-server: Privilege escalation via crafted RandR provider property requests CVE-2026-93523 — xorg-x11-server: xorg-x11-server: Out-of-bounds write via unvalidated modifier in ProcXIPassiveUngrabDevice

🎯 Affected products96

  • Red Hat Enterprise Linux AppStream (v. 9)
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)
  • xorg-x11-server-0:1.20.11-34.el9_8.4.src as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • xorg-x11-server-Xdmx-0:1.20.11-34.el9_8.4.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • xorg-x11-server-Xdmx-0:1.20.11-34.el9_8.4.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • xorg-x11-server-Xdmx-0:1.20.11-34.el9_8.4.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • xorg-x11-server-Xdmx-0:1.20.11-34.el9_8.4.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • xorg-x11-server-Xdmx-debuginfo-0:1.20.11-34.el9_8.4.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • xorg-x11-server-Xdmx-debuginfo-0:1.20.11-34.el9_8.4.aarch64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)
  • xorg-x11-server-Xdmx-debuginfo-0:1.20.11-34.el9_8.4.i686 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)
  • xorg-x11-server-Xdmx-debuginfo-0:1.20.11-34.el9_8.4.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • xorg-x11-server-Xdmx-debuginfo-0:1.20.11-34.el9_8.4.ppc64le as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)
  • xorg-x11-server-Xdmx-debuginfo-0:1.20.11-34.el9_8.4.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • xorg-x11-server-Xdmx-debuginfo-0:1.20.11-34.el9_8.4.s390x as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)
  • xorg-x11-server-Xdmx-debuginfo-0:1.20.11-34.el9_8.4.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • xorg-x11-server-Xdmx-debuginfo-0:1.20.11-34.el9_8.4.x86_64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)
  • xorg-x11-server-Xephyr-0:1.20.11-34.el9_8.4.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • xorg-x11-server-Xephyr-0:1.20.11-34.el9_8.4.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • xorg-x11-server-Xephyr-0:1.20.11-34.el9_8.4.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • xorg-x11-server-Xephyr-0:1.20.11-34.el9_8.4.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • xorg-x11-server-Xephyr-debuginfo-0:1.20.11-34.el9_8.4.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • xorg-x11-server-Xephyr-debuginfo-0:1.20.11-34.el9_8.4.aarch64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)
  • xorg-x11-server-Xephyr-debuginfo-0:1.20.11-34.el9_8.4.i686 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)
  • xorg-x11-server-Xephyr-debuginfo-0:1.20.11-34.el9_8.4.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • xorg-x11-server-Xephyr-debuginfo-0:1.20.11-34.el9_8.4.ppc64le as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)
  • xorg-x11-server-Xephyr-debuginfo-0:1.20.11-34.el9_8.4.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • xorg-x11-server-Xephyr-debuginfo-0:1.20.11-34.el9_8.4.s390x as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)
  • xorg-x11-server-Xephyr-debuginfo-0:1.20.11-34.el9_8.4.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • xorg-x11-server-Xephyr-debuginfo-0:1.20.11-34.el9_8.4.x86_64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)
  • xorg-x11-server-Xnest-0:1.20.11-34.el9_8.4.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • +66 more not shown

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Workaround: 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. To disable the graphical interface and boot into text mode: ``` systemctl set-default multi-user.target systemctl isolate multi-user.target ``` Alternatively, remove the affected packages if graphical sessions are not utilized: ``` dnf remove xorg-x11-server-Xorg xorg-x11-server-Xwayland ``` Caveats: Removing 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. Warning: Executing these commands will immediately terminate all active graphical sessions. Workaround: 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.

🔗 References (6)