CVE-2025-26601

High

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.

SeverityHigh

CVSS7.8

Exploit probability—

Product

X.org Xwayland

PublishedFeb 25, 2025

First seenFeb 25, 2025

Weakness typeCWE-416Use after free

How to fix

Update

x.org xwayland24.1.6 or later
x.org x_server21.1.16 or later

Vendor advisories

Affected products

Product	Affected versions	Fixed in
x.org xwayland	v < 24.1.6	24.1.6
tigervnc tigervnc	No range specified	—
x.org x_server	v < 21.1.16	21.1.16
redhat enterprise_linux	7.0, 8.0, 9.0	—

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