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X.Org Security Advisory: October 28, 2025

Issues in X.Org X server prior to 21.1.18 and Xwayland prior to 24.1.8
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Multiple issues have been found in the X server and Xwayland implementations
published by X.Org for which we are releasing security fixes for in
xorg-server-21.1.19 and xwayland-24.1.9.

1) CVE-2025-62229: Use-after-free in XPresentNotify structures creation

    Using the X11 Present extension, when processing and adding the
    notifications after presenting a pixmap, if an error occurs, a dangling
    pointer may be left in the error code path of the function causing a
    use-after-free when eventually destroying the notification structures
    later.

    Introduced in: Xorg 1.15
    Fixed in: xorg-server-21.1.19 and xwayland-24.1.9
    Fix: https://gitlab.freedesktop.org/xorg/xserver/-/commit/5a4286b1
    Found by: Jan-Niklas Sohn working with Trend Micro Zero Day Initiative.

2) CVE-2025-62230: Use-after-free in Xkb client resource removal

    When removing the Xkb resources for a client, the function
    XkbRemoveResourceClient() will free the XkbInterest data associated
    with the device, but not the resource associated with it.

    As a result, when the client terminates, the resource delete function
    triggers a use-after-free.

    Introduced in: X11R6
    Fixed in: xorg-server-21.1.19 and xwayland-24.1.9
    Fix: https://gitlab.freedesktop.org/xorg/xserver/-/commit/99790a2c
         https://gitlab.freedesktop.org/xorg/xserver/-/commit/10c94238
    Found by: Jan-Niklas Sohn working with Trend Micro Zero Day Initiative.

3) CVE-2025-62231: Value overflow in Xkb extension XkbSetCompatMap()

    The XkbCompatMap structure stores some of its values using an unsigned
    short, but fails to check whether the sum of the input data might
    overflow the maximum unsigned short value.

    Introduced in: X11R6
    Fixed in: xorg-server-21.1.19 and xwayland-24.1.9
    Fix: https://gitlab.freedesktop.org/xorg/xserver/-/commit/475d9f49
    Found by: Jan-Niklas Sohn working with Trend Micro Zero Day Initiative.
   
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X.Org thanks all of those who reported and fixed these issues, and those
who helped with the review and release of this advisory and these fixes.
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