Double Free Vulnerability in X.Org X Server and X Wayland
CVE-2026-88812

7.8HIGH

Key Information:

Vendor

X.org

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

What is CVE-2026-88812?

A double free vulnerability exists in the XKB SetGeometry function in X.Org X Server before version 21.1.25 and X Wayland before version 24.1.14. This flaw may allow connected clients to manipulate memory allocations, potentially leading to crashes or execution of arbitrary code within the X server context. If exploited, this vulnerability poses a threat to system stability and security.

Affected Version(s)

xorg-x11-server 0 < 21.1.25

xwayland 0 < 24.1.14

References

https://gitlab.freedesktop.org/xorg/xserver/-/commit/0d1b...
patch

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Anonymous with TrendAI Zero Day Initiative
.