A use-after-free flaw was found in X.Org and Xwayland.
Date: 2025-02
Affected: tigervnc/tigervnc, x.org/x_server, x.org/xwayland, redhat/enterprise_linux
Attack vector: other
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2025-26594
CWE: CWE-416
CVSS: 7.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)

A use-after-free flaw was found in X.Org and Xwayland. The root cursor is referenced in the X server as a global variable. If a client frees the root cursor, the internal reference points to freed memory and causes a use-after-free.


Mitigations:

Architectural layers (MAESTRO):