Use-after-free Vulnerability in X.org X Server and XWayland
CVE-2026-93516

5.5MEDIUM

Key Information:

Vendor

X.org

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

What is CVE-2026-93516?

This vulnerability occurs due to inadequate lifecycle management when handling the addition and removal of XInput master devices in X.org X Server and XWayland. Authenticated X Clients can exploit this flaw to potentially crash the X server or execute arbitrary code within the X server context. This presents significant security risks, emphasizing the importance of timely updates and management of X server components to mitigate these threats.

Affected Version(s)

xorg-x11-server 0 < 21.1.25

xwayland 0 < 24.1.14

References

https://gitlab.freedesktop.org/xorg/xserver/-/commit/be57...
patch

CVSS V3.1

Score:
5.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Anonymous working with TrendAI Zero Day Initiative
.