Skip to content
OpenAdvisories
High RHSA-2026:84574 5 CVEs

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

Published Oct 19, 2026 · Updated Oct 20, 2026

Ecosystem: Red Hat

Fixed packages 23

ReleasePackageFixed in
Red Hat · RHEL 9 enterprise_linux:9::appstream xorg-x11-server 0:1.20.11-34.el9_8.5
Red Hat · RHEL 9 enterprise_linux:9::appstream xorg-x11-server-common 0:1.20.11-34.el9_8.5
Red Hat · RHEL 9 enterprise_linux:9::appstream xorg-x11-server-debuginfo 0:1.20.11-34.el9_8.5
Red Hat · RHEL 9 enterprise_linux:9::appstream xorg-x11-server-debugsource 0:1.20.11-34.el9_8.5
Red Hat · RHEL 9 enterprise_linux:9::appstream xorg-x11-server-Xdmx 0:1.20.11-34.el9_8.5
Red Hat · RHEL 9 enterprise_linux:9::appstream xorg-x11-server-Xdmx-debuginfo 0:1.20.11-34.el9_8.5
Red Hat · RHEL 9 enterprise_linux:9::appstream xorg-x11-server-Xephyr 0:1.20.11-34.el9_8.5
Red Hat · RHEL 9 enterprise_linux:9::appstream xorg-x11-server-Xephyr-debuginfo 0:1.20.11-34.el9_8.5
Red Hat · RHEL 9 enterprise_linux:9::appstream xorg-x11-server-Xnest 0:1.20.11-34.el9_8.5
Red Hat · RHEL 9 enterprise_linux:9::appstream xorg-x11-server-Xnest-debuginfo 0:1.20.11-34.el9_8.5
Red Hat · RHEL 9 enterprise_linux:9::appstream xorg-x11-server-Xorg 0:1.20.11-34.el9_8.5
Red Hat · RHEL 9 enterprise_linux:9::appstream xorg-x11-server-Xorg-debuginfo 0:1.20.11-34.el9_8.5
Red Hat · RHEL 9 enterprise_linux:9::appstream xorg-x11-server-Xvfb 0:1.20.11-34.el9_8.5
Red Hat · RHEL 9 enterprise_linux:9::appstream xorg-x11-server-Xvfb-debuginfo 0:1.20.11-34.el9_8.5
Red Hat · RHEL 9 enterprise_linux:9::crb xorg-x11-server-debuginfo 0:1.20.11-34.el9_8.5
Red Hat · RHEL 9 enterprise_linux:9::crb xorg-x11-server-debugsource 0:1.20.11-34.el9_8.5
Red Hat · RHEL 9 enterprise_linux:9::crb xorg-x11-server-devel 0:1.20.11-34.el9_8.5
Red Hat · RHEL 9 enterprise_linux:9::crb xorg-x11-server-source 0:1.20.11-34.el9_8.5
Red Hat · RHEL 9 enterprise_linux:9::crb xorg-x11-server-Xdmx-debuginfo 0:1.20.11-34.el9_8.5
Red Hat · RHEL 9 enterprise_linux:9::crb xorg-x11-server-Xephyr-debuginfo 0:1.20.11-34.el9_8.5
Red Hat · RHEL 9 enterprise_linux:9::crb xorg-x11-server-Xnest-debuginfo 0:1.20.11-34.el9_8.5
Red Hat · RHEL 9 enterprise_linux:9::crb xorg-x11-server-Xorg-debuginfo 0:1.20.11-34.el9_8.5
Red Hat · RHEL 9 enterprise_linux:9::crb xorg-x11-server-Xvfb-debuginfo 0:1.20.11-34.el9_8.5

Vulnerabilities 5

  • High 8.5
    CVE-2026-93517

    X.Org Server GLX RenderLarge Heap Buffer Overflow

    A heap buffer overflow in handling GLX RenderLarge request where dataBytes exceeds cmdlen in X.org X server before 21.1.25 and XWayland before 24.1.14 that could be be triggered by an authenticated X client could cause crashes or code execution in X server co…

    X.Org x.orgg xwayland xorg-x11-server Debian Ubuntu Azure Linux Alpine
  • High 7.8
    CVE-2026-93518

    X.Org Server XKB ResizeKeyType Numeric Truncation

    An integer truncation issue in XkbResizeKeyType() that could lead to a heap buffer overflow by authenticated X clients in X.org X server before 21.1.25 and XWayland before 24.1.14 could be exploited for crashes or potential code execution in the X server.

    X.Org xwayland xorg-x11-server xorg-server Debian Ubuntu Azure Linux Alpine
  • High 7.8
    CVE-2026-93519

    X.Org Server XFixes Pointer Barrier Event List Buffer Overflow

    A buffer overflow when handling pointer barriers in the XFIXES extension in X.Org X server before 21.1.25 and XWayland before 24.1.14 could be used by authenticated X clients to crash or potentially execute code in X server context.

    X.Org x.orgg xorg-x11-server xwayland Debian Ubuntu Azure Linux Alpine
  • High 7.8
    CVE-2026-93520

    X.Org Server XKB ChangeKeycodeRange Heap Out-of-Bounds Write

    A heap buffer overflow caused by mismatching size calculations between XkbAllocNames and ChangeKeycodeRange in X.org X server before 2.1.25 and XWayland before 24.1.14 could be used by authenticated X clients to crash or potentially execute code in X server c…

    X.Org xwayland xorg-x11-server xorg-server Debian Ubuntu Azure Linux Alpine
  • Medium 5.5
    CVE-2026-93516

    .Org Server XInput Passive Grab Use-After-Free

    A use-after-free caused by lack of lifecycle management when adding / removing XInput master devices in X.org X Server before 21.1.25 and XWayland before 24.1.14 could be used by authenticated X Clients to crash the X server or potentially execute code in X s…

    X.Org xwayland xorg-x11-server xorg-server Debian Ubuntu Azure Linux Alpine

References

  • article
    https://access.redhat.com/security/updates/classification/#important
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2545161
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2545246
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2545860
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2545887
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2545908
  • advisory
    https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_84574.json
  • report
    https://access.redhat.com/security/cve/CVE-2026-93516
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-93516
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-93516
  • report
    https://access.redhat.com/security/cve/CVE-2026-93517
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-93517
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-93517
  • report
    https://access.redhat.com/security/cve/CVE-2026-93518
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-93518
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-93518
  • report
    https://access.redhat.com/security/cve/CVE-2026-93519
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-93519
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-93519
  • report
    https://access.redhat.com/security/cve/CVE-2026-93520
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-93520
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-93520