CVE-2025-26599

High

Description

An access to an uninitialized pointer flaw was found in X.Org and Xwayland. The function compCheckRedirect() may fail if it cannot allocate the backing pixmap. In that case, compRedirectWindow() will return a BadAlloc error without validating the window tree marked just before, which leaves the validated data partly initialized and the use of an uninitialized pointer later.

SeverityHigh

CVSS7.8

Exploit probability—

Product

X.org Xwayland

PublishedFeb 25, 2025

First seenFeb 25, 2025

Weakness typeCWE-824CWE-824

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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