ZDI-26-768: X.Org Server XInput ProcXIPassiveUngrabDevice Heap-based Buffer Overflow Privilege Escalation Vulnerability
This vulnerability allows local attackers to escalate privileges on affected installations of X.Org Server. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The ZDI has assigned a CVSS rating of 7.8. The following CVEs are assigned: CVE-2026-93523.
Affected Software
Event History
Frequently Asked Questions
Who is exposed to this vulnerability?
Affected X.Org Server installations are exposed when an attacker can execute low-privileged code locally on the system. It is a local privilege-escalation issue, not one described as remotely exploitable in the available information.
What does an attacker need before exploitation?
The attacker must first obtain the ability to run code with low privileges on the target system. The provided information does not identify any additional prerequisites or affected configuration details.
What is the potential impact of successful exploitation?
Successful exploitation allows a local attacker to escalate privileges on the affected system. The issue is identified as a heap-based buffer overflow in XInput ProcXIPassiveUngrabDevice and is assigned CVE-2026-93523.