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High ELSA-2026-86907 8 CVEs

Important: xorg-x11-server-Xwayland security update (Oracle Linux 8)

Published Oct 21, 2026 · Updated Oct 21, 2026

Ecosystem: Oracle Linux

Summary

[21.1.3-20.4]
- CVE fix for: CVE-2026-88812, CVE-2026-93515, CVE-2026-93516
CVE-2026-93517, CVE-2026-93518, CVE-2026-93519,
CVE-2026-93520, CVE-2026-93521, CVE-2026-93523,
CVE-2026-93524
Resolves: https://redhat.atlassian.net/browse/RHEL-277856
Resolves: https://redhat.atlassian.net/browse/RHEL-277838
Resolves: https://redhat.atlassian.net/browse/RHEL-275768
Resolves: https://redhat.atlassian.net/browse/RHEL-276864
Resolves: https://redhat.atlassian.net/browse/RHEL-276342
Resolves: https://redhat.atlassian.net/browse/RHEL-276410
Resolves: https://redhat.atlassian.net/browse/RHEL-277876
Resolves: https://redhat.atlassian.net/browse/RHEL-277870

Fixed packages 1

ReleasePackageFixed in
Oracle Linux · 8 xorg-x11-server-Xwayland 0:21.1.3-20.el8_10.4

Vulnerabilities 8

  • 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-2026-88812

    X.Org Server XKB SetGeometry TextDoodad Double Free

    A double free in XKB SetGeometryin X.Org X Server before 21.1.25 and X Wayland before 24.1.14 could be used by attached clients to cause a crash or potentially code in the x server context.

    X.Org xwayland xorg-x11-server xorg-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
  • High 7.8
    CVE-2026-93521

    X.Org Server RandR ChangeProviderProperty Heap Buffer Overflow

    A buffer overflow in RandR ChangeProviderProperty requests in X.Org X Server before 2.1.25 and XWayland before 24.4.14 could be used by authenticated X clients to crash or execute code within the X server context.

    X.Org xwayland xorg-x11-server xorg-server Debian Ubuntu Azure Linux Alpine
  • High 7.8
    CVE-2026-93523

    X.Org Server XInput2 PassiveUngrabDevice Out-of-Bounds Write

    A heap buffer overflow caused by a XIPassiveUngrabDevice request with an out-of-range modifier value in X.Org X Server before 21.1.15 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 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