Use-After-Free Vulnerability in X.org X Server Products
CVE-2026-93515

6.8MEDIUM

Key Information:

Vendor

X.org

Status
Xorg-x11-server
Xwayland
Vendor
CVE Published:
28 October 2026

What is CVE-2026-93515?

A critical use-after-free vulnerability exists in the present_clear_window_notifies() function of the X.org X Server prior to version 21.1.25 and X Wayland prior to version 24.1.14. This flaw can be exploited by malicious X clients to potentially crash the X server or execute arbitrary code within the server context. This may lead to unauthorized access, system instability, and compromised system integrity.

Affected Version(s)

xorg-x11-server 0 < 21.1.25

xwayland 0 < 24.1.14

References

https://gitlab.freedesktop.org/xorg/xserver/-/commit/1b69...
patch

CVSS V4

Score:
6.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Anonymous working with TrendAI Zero Day Initiative
.