CVE-2026-93519

A flaw was found in xorg-x11-server. The server writes pointer barrier events into a fixed-size buffer without properly validating boundaries. An authenticated client can trigger this issue by configuring excessive pointer barriers and generating cursor motion events, causing a buffer overflow. This vulnerability may lead to arbitrary code execution or cause the server to crash, resulting in a Denial of Service (DoS).

This vulnerability is evaluated as having a Moderate severity for Red Hat Enterprise Linux because exploitation is restricted to an authenticated local user with access to an active X11 display session, preventing remote exploitation. A local client can trigger memory corruption within the display server by defining a large number of cursor barriers and subsequently generating pointer movement. While this flaw can lead to a crash of the display server or potentially execute code within the context of the running X server process, the blast radius is confined to the local graphical user session.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.