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ALSA-2025:2500 — Important: tigervnc security update

Affected: AlmaLinux:9: tigervnc, AlmaLinux:9: tigervnc-icons, AlmaLinux:9: tigervnc-license, AlmaLinux:9: tigervnc-selinux, AlmaLinux:9: tigervnc-server, AlmaLinux:9: tigervnc-server-minimal, AlmaLinux:9: tigervnc-server-module

Virtual Network Computing (VNC) is a remote display system which allows users to view a computing desktop environment not only on the machine where it is running, but from anywhere on the Internet and from a wide variety of machine architectures. TigerVNC is a suite of VNC servers and clients.

Security Fix(es):

* X.Org: Xwayland: Use-after-free of the root cursor (CVE-2025-26594) * xorg: xwayland: Use-after-free in SyncInitTrigger() (CVE-2025-26601) * xorg: xwayland: Use-after-free in PlayReleasedEvents() (CVE-2025-26600) * xorg: xwayland: Use of uninitialized pointer in compRedirectWindow() (CVE-2025-26599) * xorg: xwayland: Out-of-bounds write in CreatePointerBarrierClient() (CVE-2025-26598) * xorg: xwayland: Buffer overflow in XkbChangeTypesOfKey() (CVE-2025-26597) * xorg: xwayland: Heap overflow in XkbWriteKeySyms() (CVE-2025-26596) * Xorg: xwayland: Buffer overflow in XkbVModMaskText() (CVE-2025-26595)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

bdu:2025-04569

BELL-CVE-2025-26601

Affected: Alpaquita:23: xorg-server, Alpaquita:stream: xorg-server

certfr-2025-avi-0855 — De multiples vulnérabilités ont été découvertes dans les produits Juniper Networks. Certaines d'entre elles permettent…

certfr-2025-avi-0855

EUVD-2026-331190

fkie_cve-2025-26601

A use-after-free flaw was found in X.Org and Xwayland. When changing an alarm, the values of the change mask are evaluated one after the other, changing the trigger values as requested, and eventually, SyncInitTrigger() is called. If one of the changes triggers an error, the function will return early, not adding the new sync object, possibly causing a use-after-free when the alarm eventually triggers.

GHSA-gf8x-6jh7-3mjv

msrc_CVE-2025-26601 — Xorg: xwayland: use-after-free in syncinittrigger()

msrc_CVE-2025-26601

OESA-2025-1429 — xorg-x11-server security update

Affected: openEuler:24.03-LTS-SP1: xorg-x11-server, openEuler:20.03-LTS-SP4: xorg-x11-server, openEuler:22.03-LTS-SP3: xorg-x11-server, openEuler:22.03-LTS-SP4: xorg-x11-server, openEuler:24.03-LTS: xorg-x11-server

X.Org X11 X server Security Fix(es):

A use-after-free flaw was found in X.Org and Xwayland. The root cursor is referenced in the X server as a global variable. If a client frees the root cursor, the internal reference points to freed memory and causes a use-after-free.(CVE-2025-26594)

A buffer overflow flaw was found in X.Org and Xwayland. The code in XkbVModMaskText() allocates a fixed-sized buffer on the stack and copies the names of the virtual modifiers to that buffer. The code fails to check the bounds of the buffer and would copy the data regardless of the size.(CVE-2025-26595)

A heap overflow flaw was found in X.Org and Xwayland. The computation of the length in XkbSizeKeySyms() differs from what is written in XkbWriteKeySyms(), which may lead to a heap-based buffer overflow.(CVE-2025-26596)

A buffer overflow flaw was found in X.Org and Xwayland. If XkbChangeTypesOfKey() is called with a 0 group, it will resize the key symbols table to 0 but leave the key actions unchanged. If the same function is later called with a non-zero value of groups, this will cause a buffer overflow because the key actions are of the wrong size.(CVE-2025-26597)

An out-of-bounds write flaw was found in X.Org and Xwayland. The function GetBarrierDevice() searches for the pointer device based on its device ID and returns the matching value, or supposedly NULL, if no match was found. However, the code will return the last element of the list if no matching device ID is found, which can l…

openSUSE-SU-2025:14841-1 — xorg-x11-server-21.1.15-2.1 on GA media

xorg-x11-server-21.1.15-2.1 on GA media

RHSA-2025:2862 — Red Hat Security Advisory: tigervnc security update

X.Org: Xwayland: Use-after-free of the root cursor Xorg: xwayland: Buffer overflow in XkbVModMaskText() xorg: xwayland: Heap overflow in XkbWriteKeySyms() xorg: xwayland: Buffer overflow in XkbChangeTypesOfKey() xorg: xwayland: Out-of-bounds write in CreatePointerBarrierClient() xorg: xwayland: Use of uninitialized pointer in compRedirectWindow() xorg: xwayland: Use-after-free in PlayReleasedEvents() xorg: xwayland: Use-after-free in SyncInitTrigger()

SUSE-SU-2025:0729-1 — Security update for xwayland

Security update for xwayland

UBUNTU-CVE-2025-26601

Affected: Ubuntu:Pro:14.04:LTS: xorg-server, Ubuntu:Pro:16.04:LTS: xorg-server, Ubuntu:Pro:16.04:LTS: xorg-server-hwe-16.04, Ubuntu:Pro:18.04:LTS: xorg-server, Ubuntu:Pro:18.04:LTS: xorg-server-hwe-18.04, Ubuntu:20.04:LTS: xorg-server, Ubuntu:22.04:LTS: xorg-server, Ubuntu:22.04:LTS: xwayland, Ubuntu:24.04:LTS: xorg-server, Ubuntu:24.04:LTS: xwayland and 1 more

WID-SEC-W-2025-0435 — X.Org X11: Mehrere Schwachstellen ermöglichen nicht näher spezifizierte Auswirkungen, möglicherweise Codeausführung

Ein lokaler Angreifer kann mehrere Schwachstellen in X.Org X11 ausnutzen, um nicht spezifizierte Effekte zu verursachen, was möglicherweise zur Ausführung von beliebigem Code führt.