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Medium WID-SEC-2026-3787 12 CVEs

X.Org X11 und Xwayland: Mehrere Schwachstellen

Published Oct 6, 2026 · Updated Nov 12, 2026 · Revision 20 · de

Vendor: amazon Vendor: Fedora Vendor: OpenBSD Vendor: Oracle Vendor: Red Hat Vendor: RESF Vendor: SUSE Product: Enterprise Linux Product: Linux Product: Linux Product: Linux Product: Linux 2 Product: OpenBSD Product: openSUSE Product: Rocky Linux Platform: Linux

Summary

Ein lokaler Angreifer kann mehrere Schwachstellen in X.Org X11 und Xwayland ausnutzen, um beliebigen Programmcode auszuführen und um einen Denial of Service Zustand herbeizuführen.

Product

Das X Window System dient der Erzeugung grafischer Oberflächen auf Unix Systemen.
Xwayland ist ein X-Server für die Ausführung von X-Clients unter Wayland Display Servern. Wayland ist ein Ersatz für X.11 Display-Server.

Vulnerabilities 12

  • 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-2026-93522

    X.Org Server Glamor CopyArea Heap Buffer Overflow

    A heap buffer overflow caused by mismatched size usage in CopyArea CPU-to-FBO path 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 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 6.9
    CVE-2026-93524

    X.Org Server XKB SetMap Key Width/Action Count Desync Out-Of-Bounds Read

    A buffer overread in CheckKeySyms() in X.Org X Server before 21.1.25 and XWayland before 24.1.14 could be used by authenticated X clients to leak small amounts of information from X server memory or potentially crash the X server.

    X.Org xwayland xorg-x11-server xorg-server Debian Ubuntu Azure Linux Alpine
  • Medium 6.8
    CVE-2026-93515

    .Org Server Present Extension Use-After-Free

    A use-after-free in present_clear_window_notifies() in the X.org X Server before 21.1.25 and X Wayland before 24.1.14 could be used by malicious X clients to crash or potentially execute code in the 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
  • Medium 5.3
    CVE-2026-93536

    X.Org Server GestureBuildSprite Use-After-Free

    A use after free caused by missing lifecycle management of gesture sprites in GestureBuildSprite() 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.

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

Revision history

  1. #20

    Neue Updates von Red Hat aufgenommen

  2. #19

    Neue Updates von Red Hat aufgenommen

  3. #18

    Neue Updates von Red Hat aufgenommen

  4. #17

    Neue Updates von Rocky Enterprise Software Foundation aufgenommen

  5. #16

    Neue Updates von Oracle Linux aufgenommen

  6. #15

    Neue Updates von Fedora aufgenommen

  7. #14

    Referenz(en) aufgenommen: EUVD-2026-112123, EUVD-2026-112146, EUVD-2026-112041, EUVD-2026-112122, EUVD-2026-112254

  8. #13

    Referenz(en) aufgenommen: EUVD-2026-111276

  9. #12

    Neue Updates von Oracle Linux aufgenommen

  10. #11

    Neue Updates von Red Hat und Amazon aufgenommen

  11. #10

    Neue Updates von Red Hat, Oracle Linux und SUSE aufgenommen

  12. #9

    Neue Updates von Rocky Enterprise Software Foundation und SUSE aufgenommen

  13. #8

    Neue Updates von Oracle Linux und Red Hat aufgenommen

  14. #7

    Neue Updates von Red Hat und openSUSE aufgenommen

  15. #6

    Referenz(en) aufgenommen: ZDI-26-765, ZDI-26-763, ZDI-26-760, ZDI-26-759, ZDI-26-761, ZDI-26-762, ZDI-26-769, ZDI-26-768, ZDI-26-767, ZDI-26-766, ZDI-26-764

  16. #5

    Neue Updates von Fedora und SUSE aufgenommen

  17. #4

    Neue Updates von Rocky Enterprise Software Foundation, SUSE und Oracle Linux aufgenommen

  18. #3

    Neue Updates von Red Hat aufgenommen

  19. #2

    Neue Updates von Fedora aufgenommen

  20. #1

    Initiale Fassung

References