ZDI-CAN-31944: ZDI-26-766: X.Org Server RandR Heap-based Buffer Overflow Privilege Escalation Vulnerability
Published Oct 15, 2026
·Updated
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-2026-93521.
Affected Software
1 affected component
X.Org Foundation X.Org Server
Event History
Oct 15, 2026
Advisory Published
via ZDI·05:00 AM
Data Sourced
via ZDI·05:00 AM
Description
Frequently Asked Questions
1
Who is exposed to this vulnerability?
Systems running affected installations of X.Org Server are exposed, but exploitation requires an attacker to already be able to execute low-privileged code locally on the target.
2
Can this be exploited remotely without prior access?
The available information describes this as a local privilege-escalation vulnerability. It requires prior low-privileged code execution on the target system.
3
What is the assigned CVE and severity rating?
This issue is tracked as CVE-2026-93521 and has a CVSS rating of 7.8.