RHEL 9 : xorg-x11-server-Xwayland (RHSA-2026:20560)

The remote Redhat Enterprise Linux 9 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:20560 advisory. Xwayland is an X server for running X clients under Wayland. Security Fixes: xorg: xwayland: X.Org X server: Denial of Service via integer...

Astra Linux – Vulnerability in xorg-server

A vulnerability was discovered in X.Org. This security flaw arises due to issues with the length validation of the handler for the XIChangeProperty request, leading to out-of-bounds memory reads and potential information disclosure. This issue can result in elevation of local privileges on system...

Astra Linux – Vulnerability in xorg-server

A flaw was discovered in the X.Org server. Both DeviceFocusEvent and XIQueryPointer responses contain a bit for each logical button that is currently active. Buttons can be arbitrarily mapped to any value up to 255, but the X.Org Server only allocates space for the specific number of buttons on...

Astra Linux – Vulnerability in xorg-server, xwayland

A use-after-free flaw was identified in X.Org and Xwayland. When changing an alarm, the values of the change mask are evaluated one after the other, modifying the trigger values as required. Eventually, the SyncInitTrigger function is called. If one of these changes causes an error, the function...

Astra Linux – Vulnerability in xorg-server, xwayland

A heap-based buffer overflow vulnerability was discovered in the X.org server’s ProcXIGetSelectedEvents function. This issue occurs when length values that are swapped in bytes are used in replies. This can potentially lead to memory leakage and segmentation faults, especially when triggered by a...

Astra Linux – Vulnerability in xorg-server

A heap buffer overflow flaw was discovered in the DisableDevice function of the X.Org server. This issue may cause an application to crash, or in some cases, lead to remote code execution in SSH X11 forwarding environments...

xorg: xwayland: X.Org X server: Information exposure and denial of service via out-of-bounds memory access

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,...

Important: Red Hat Security Advisory: xorg-x11-server security update

An update for xorg-x11-server is now available for Red Hat Enterprise Linux 9. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerabilit...

xorg: xwayland: X.Org X server: Information exposure and denial of service via out-of-bounds memory access

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,...

xorg: xwayland: X.Org X server: Information exposure and denial of service via out-of-bounds memory access

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,...

EUVD-2026-27341

A flaw was found in the X.Org X server. This out-of-bounds read vulnerability in the XKB geometry processing, specifically within the CheckSetGeom and XkbAddGeomKeyAlias functions, allows an attacker to read uninitialized or out-of-bounds memory. An attacker with a connection to the X11 server,...

CVE-2026-34000 Xwayland: xorg: x.org x server: information disclosure and denial of service via out-of-bounds read in xkb geometry processing.

A flaw was found in the X.Org X server. This out-of-bounds read vulnerability in the XKB geometry processing, specifically within the CheckSetGeom and XkbAddGeomKeyAlias functions, allows an attacker to read uninitialized or out-of-bounds memory. An attacker with a connection to the X11 server,...

CVE-2026-34000

A flaw was found in the X.Org X server. This out-of-bounds read vulnerability in the XKB geometry processing, specifically within the CheckSetGeom and XkbAddGeomKeyAlias functions, allows an attacker to read uninitialized or out-of-bounds memory. An attacker with a connection to the X11 server,...

xorg: xwayland: X.Org X server: Information exposure and denial of service via out-of-bounds memory access

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,...

ALSA-2026:13414 Important: tigervnc security update

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...

Important: tigervnc security update

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...

RLSA-2026:11692 Important: xorg-x11-server security update

X.Org is an open-source implementation of the X Window System. It provides the basic low-level functionality that full-fledged graphical user interfaces are designed upon. Security Fixes: xorg: xwayland: X.Org X server: Denial of Service via integer underflow in XKB compatibility map handling...

AlmaLinux 9 : xorg-x11-server-Xwayland (ALSA-2026:11369)

The remote AlmaLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:11369 advisory. xorg: xwayland: X.Org X server: Denial of Service via integer underflow in XKB compatibility map handling CVE-2026-33999 xorg: xwayland: X.Org X server:...

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...

Important: xorg-x11-server security update

X.Org is an open-source implementation of the X Window System. It provides the basic low-level functionality that full-fledged graphical user interfaces are designed upon. Security Fixes: xorg: xwayland: X.Org X server: Denial of Service via integer underflow in XKB compatibility map handling...