RHSA-2026:84574HighCVSS 7.8

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

Published
October 19, 2026
Last Modified
October 29, 2026

🔗 CVE IDs covered (5)

CVE-2026-93516 →CVE-2026-93517 →CVE-2026-93518 →CVE-2026-93519 →CVE-2026-93520 →

📋 Description

CVE-2026-93516 — xorg-x11-server: xorg-x11-server: Arbitrary code execution via use-after-free in passive grab handling CVE-2026-93517 — xorg-x11-server: xorg-x11-server: arbitrary code execution via GLX RenderLarge heap-based buffer overflow CVE-2026-93518 — xorg-x11-server: xorg-x11-server: arbitrary code execution via integer truncation during keyboard mapping resize CVE-2026-93519 — xorg-x11-server: xorg-x11-server: Arbitrary code execution via buffer overflow in input_constrain_cursor() CVE-2026-93520 — xorg-x11-server: xorg-x11-server: arbitrary code execution via out-of-bounds write in XKB keycode handling

🎯 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_8.5.src as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • xorg-x11-server-Xdmx-0:1.20.11-34.el9_8.5.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • xorg-x11-server-Xdmx-0:1.20.11-34.el9_8.5.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • xorg-x11-server-Xdmx-0:1.20.11-34.el9_8.5.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • xorg-x11-server-Xdmx-0:1.20.11-34.el9_8.5.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • xorg-x11-server-Xdmx-debuginfo-0:1.20.11-34.el9_8.5.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • xorg-x11-server-Xdmx-debuginfo-0:1.20.11-34.el9_8.5.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_8.5.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_8.5.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • xorg-x11-server-Xdmx-debuginfo-0:1.20.11-34.el9_8.5.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_8.5.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • xorg-x11-server-Xdmx-debuginfo-0:1.20.11-34.el9_8.5.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_8.5.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • xorg-x11-server-Xdmx-debuginfo-0:1.20.11-34.el9_8.5.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_8.5.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • xorg-x11-server-Xephyr-0:1.20.11-34.el9_8.5.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • xorg-x11-server-Xephyr-0:1.20.11-34.el9_8.5.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • xorg-x11-server-Xephyr-0:1.20.11-34.el9_8.5.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • xorg-x11-server-Xephyr-debuginfo-0:1.20.11-34.el9_8.5.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • xorg-x11-server-Xephyr-debuginfo-0:1.20.11-34.el9_8.5.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_8.5.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_8.5.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • xorg-x11-server-Xephyr-debuginfo-0:1.20.11-34.el9_8.5.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_8.5.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • xorg-x11-server-Xephyr-debuginfo-0:1.20.11-34.el9_8.5.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_8.5.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • xorg-x11-server-Xephyr-debuginfo-0:1.20.11-34.el9_8.5.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_8.5.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: 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 (8)