xorg: xwayland: X.Org X server: Use-after-free vulnerability leads to server crash and potential memory corruption

A flaw was found in the X.Org X server. This use-after-free vulnerability occurs in the XSYNC fence triggering logic, specifically within the miSyncTriggerFence function. An attacker with access to the X11 server can exploit this without user interaction, leading to a server crash and potentially...

The vulnerability of the XkbAddGeomKeyAlias() function in the XKB component of the Wayland protocol implementation for X.Org XWaylan, as well as in the X.Org Server implementation of the X Window System, allows a malicious actor to trigger a service failure.

The vulnerability of the XkbAddGeomKeyAlias function in the XKB component of the Wayland protocol implementation for X.Org XWaylan, as well as in the X.Org Server implementation of the X Window System, is related to reading data from beyond the allowed buffer size. Exploiting this vulnerability c...

The vulnerability of the miSyncTriggerFence() function in the XSYNC component of the Wayland protocol for X.Org XWaylan, as well as in the implementation of the X.Org Server, allows a attacker to trigger a service failure.

The vulnerability of the miSyncTriggerFence function in the XSYNC component of the Wayland protocol for X.Org XWaylan, as well as in the implementation of the X.Org Server, is related to the use of memory after it is freed. Exploiting this vulnerability could allow a attacker to cause a service...

Fedora 42 : xorg-x11-server (2026-2c6941716b)

The remote Fedora 42 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-2c6941716b advisory. Update to xserver 21.1.22, CVE fix for: CVE-2026-33999, CVE-2026-34000, CVE-2026-34001, CVE-2026-34002, CVE-2026-34003 Tenable has extracted the...

EUVD-2026-25231

A flaw was found in the X.Org X server's XKB key types request validation. A local attacker could send a specially crafted request to the X server, leading to an out-of-bounds memory access vulnerability. This could result in the disclosure of sensitive information or cause the server to crash,...

CVE-2026-34003

A flaw was found in the X.Org X server's XKB key types request validation. A local attacker could send a specially crafted request to the X server, leading to an out-of-bounds memory access vulnerability. This could result in the disclosure of sensitive information or cause the server to crash,...

CVE-2026-34003

The CVE-2026-34003 issue is a local, out-of-bounds/ buffer-overflow in the XKB key types validation of the X.Org X server (Xwayland included in affected stacks). Public reports enumerate XKB Buffer overflow in CheckKeyTypes() as the root cause, leading to possible information disclosure and Denia...

CVE-2026-34001 Xorg: xwayland: x.org x server: use-after-free vulnerability leads to server crash and potential memory corruption

A flaw was found in the X.Org X server. This use-after-free vulnerability occurs in the XSYNC fence triggering logic, specifically within the miSyncTriggerFence function. An attacker with access to the X11 server can exploit this without user interaction, leading to a server crash and potentially...

X.Org X Server 数字错误漏洞

X.Org X Server is an X Window system display server developed by the X.Org Foundation. X.Org X Server has a numerical error vulnerability, which stems from integer underflow in the XKB compatibility mapping process. This vulnerability may allow attackers to trigger a buffer overflow, leading to...

[SECURITY] Fedora 43 Update: xorg-x11-server-Xwayland-24.1.10-1.fc43

Xwayland is an X server for running X clients under Wayland...

PT-2026-46940

Name of the Vulnerable Software and Affected Versions X.Org X server affected versions not specified Xwayland affected versions not specified Description A use-after-free flaw exists in the FreeCounter function. This occurs when a client establishes multiple SyncCounters and awaits their triggers...

PT-2026-46942

Name of the Vulnerable Software and Affected Versions X.Org X server affected versions not specified Xwayland affected versions not specified Description An out-of-bounds read flaw exists in the glXDisp ChangeDrawableAttributes function. Due to an incorrect size validation check, the system may...

[slackware-security] tigervnc

New tigervnc packages are available for Slackware 15.0 and -current to fix security issues. Here are the details from the Slackware 15.0 ChangeLog: extra/tigervnc/tigervnc-1.16.2-i586-2slack15.0.txz: Rebuilt. Rebuilt against xorg-server-1.20.14 patched to fix security issues: XKB Integer Underflo...

FreeBSD : xwayland -- Multiple vulnerabilities (099423d1-3815-11f1-a284-589cfc10a551)

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the 099423d1-3815-11f1-a284-589cfc10a551 advisory. X.Org project reports: Multiple issues have been found in the X server and Xwayland...

OPENSUSE-SU-2026:20544-1 Security update for xorg-x11-server

This update for xorg-x11-server fixes the following issues: - CVE-2026-33999: XKB Integer Underflow in XkbSetCompatMap bsc1260922. - CVE-2026-34000: XKB Out-of-bounds Read in CheckSetGeom bsc1260923. - CVE-2026-34001: XSYNC Use-after-free in miSyncTriggerFence bsc1260924. - CVE-2026-34002: XKB...

Slackware: Security Advisory (SSA:2026-104-02)

The remote host is missing an update for the SPDX-FileCopyrightText: 2026 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only ifdescription...

[slackware-security] xorg-server

New xorg-server packages are available for Slackware 15.0 and -current to fix security issues. Here are the details from the Slackware 15.0 ChangeLog: patches/packages/xorg-server-1.20.14-i586-19slack15.0.txz: Rebuilt. This update fixes security issues: XKB Integer Underflow in XkbSetCompatMap. X...

SUSE-SU-2026:1330-1 Security update for xorg-x11-server

This update for xorg-x11-server fixes the following issues: - CVE-2026-33999: XKB Integer Underflow in XkbSetCompatMap bsc1260922. - CVE-2026-34000: XKB Out-of-bounds Read in CheckSetGeom bsc1260923. - CVE-2026-34001: XSYNC Use-after-free in miSyncTriggerFence bsc1260924. - CVE-2026-34002: XKB...

Linux Distros Unpatched Vulnerability : CVE-2026-34002

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - A flaw was found in the X.Org X server. This vulnerability, an out-of-bounds read, affects the XKB X Keyboard Extension modifier map handling. An attacker with...

Linux Distros Unpatched Vulnerability : CVE-2026-34003

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - A flaw was found in the X.Org X server's XKB key types request validation. A local attacker could send a specially crafted request to the X server, leading to a...