CVE-2025-26601 Information

Description

A use-after-free flaw was found in X.Org and Xwayland. When changing an alarm the values of the change mask are evaluated one after the other changing the trigger values as requested and eventually SyncInitTrigger() is called. If one of the changes triggers an error the function will return early not adding the new sync object possibly causing a use-after-free when the alarm eventually triggers.

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Reference

https://access.redhat.com/security/cve/CVE-2025-26601 https://bugzilla.redhat.com/show_bug.cgi?id=2345251

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.8