ALAS2023-2025-1268

References: CVE-2025-62229  CVE-2025-62230  CVE-2025-62231 
FAQs regarding Amazon Linux ALAS/CVE Severity

Issue Overview:

A flaw was found in the X.Org X server and Xwayland when processing X11 Present extension notifications. Improper error handling during notification creation can leave dangling pointers that lead to a use-after-free condition. This can cause memory corruption or a crash, potentially allowing an attacker to execute arbitrary code or cause a denial of service. (CVE-2025-62229)

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.

NOTE: https://lists.x.org/archives/xorg-announce/2025-October/003635.html
NOTE: Fixed by: https://gitlab.freedesktop.org/xorg/xserver/-/commit/99790a2c9205a52fbbec01f21a92c9b7f4ed1d8f
NOTE: Fixed by: https://gitlab.freedesktop.org/xorg/xserver/-/commit/10c94238bdad17c11707e0bdaaa3a9cd54c504be
NOTE: Fixed by: https://gitlab.freedesktop.org/xorg/xserver/-/commit/865089ca70840c0f13a61df135f7b44a9782a175 (xorg-server-21.1.19)
NOTE: Fixed by: https://gitlab.freedesktop.org/xorg/xserver/-/commit/87fe2553937a99fd914ad0cde999376a3adc3839 (xorg-server-21.1.19) (CVE-2025-62230)

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

NOTE: https://lists.x.org/archives/xorg-announce/2025-October/003635.html
NOTE: Fixed by: https://gitlab.freedesktop.org/xorg/xserver/-/commit/475d9f49acd0e55bc0b089ed77f732ad18585470
NOTE: Fixed by: https://gitlab.freedesktop.org/xorg/xserver/-/commit/3baad99f9c15028ed8c3e3d8408e5ec35db155aa (xorg-server-21.1.19) (CVE-2025-62231)

Issue Correction:
Run dnf update xorg-x11-server-Xwayland --releasever 2023.9.20251110 or dnf update --advisory ALAS2023-2025-1268 --releasever 2023.9.20251110 to update your system.
More information on how to update your system can be found on this page: Amazon Linux 2023 documentation

New Packages:

aarch64:
    xorg-x11-server-Xwayland-debuginfo-24.1.3-1.amzn2023.0.3.aarch64
    xorg-x11-server-Xwayland-devel-24.1.3-1.amzn2023.0.3.aarch64
    xorg-x11-server-Xwayland-24.1.3-1.amzn2023.0.3.aarch64
    xorg-x11-server-Xwayland-debugsource-24.1.3-1.amzn2023.0.3.aarch64

src:
    xorg-x11-server-Xwayland-24.1.3-1.amzn2023.0.3.src

x86_64:
    xorg-x11-server-Xwayland-debuginfo-24.1.3-1.amzn2023.0.3.x86_64
    xorg-x11-server-Xwayland-devel-24.1.3-1.amzn2023.0.3.x86_64
    xorg-x11-server-Xwayland-debugsource-24.1.3-1.amzn2023.0.3.x86_64
    xorg-x11-server-Xwayland-24.1.3-1.amzn2023.0.3.x86_64