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High ELSA-2026-84574 5 CVEs

Important: xorg-x11-server security update (Oracle Linux 9)

Published Oct 19, 2026 · Updated Oct 19, 2026

Ecosystem: Oracle Linux

Summary

[1.20.11-34.5]
- CVE fix for: CVE-2026-93516, CVE-2026-93517, CVE-2026-93518,
CVE-2026-93519, CVE-2026-93520
Resolves: https://redhat.atlassian.net/browse/RHEL-282169
Resolves: https://redhat.atlassian.net/browse/RHEL-282173
Resolves: https://redhat.atlassian.net/browse/RHEL-282180
Resolves: https://redhat.atlassian.net/browse/RHEL-282184
Resolves: https://redhat.atlassian.net/browse/RHEL-282193

Fixed packages 8

ReleasePackageFixed in
Oracle Linux · 9 xorg-x11-server-common 0:1.20.11-34.el9_8.5
Oracle Linux · 9 xorg-x11-server-devel 0:1.20.11-34.el9_8.5
Oracle Linux · 9 xorg-x11-server-source 0:1.20.11-34.el9_8.5
Oracle Linux · 9 xorg-x11-server-Xdmx 0:1.20.11-34.el9_8.5
Oracle Linux · 9 xorg-x11-server-Xephyr 0:1.20.11-34.el9_8.5
Oracle Linux · 9 xorg-x11-server-Xnest 0:1.20.11-34.el9_8.5
Oracle Linux · 9 xorg-x11-server-Xorg 0:1.20.11-34.el9_8.5
Oracle Linux · 9 xorg-x11-server-Xvfb 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