CVE-2026-56000

High

Description

Local attackers with a X connection able to provide GLX commit to the X server xorg-server before 21.2.24 and xwayland before 24.1.13 could cause a Heap Use After Free, due to CommonMakeCurrent() pointing into potentially reallocated memory.

SeverityHigh

CVSS7.8

Exploit probability—

ProductX.org Xwayland

PublishedJul 8, 2026

First seenJul 8, 2026

Weakness typeCWE-416Use after free

How to fix

Update

x.org xwayland24.1.13 or later
x.org x_server21.2.24 or later

Patches

gitlab.freedesktop.org/xorg/xserver/-/commit/2779affbdb4354e894f490e56f962527d6125043

Vendor advisories

openwall.com/lists/oss-security/2026/07/08/2

Affected products

Product	Affected versions	Fixed in
x.org xwayland	v < 24.1.13	24.1.13
x.org x_server	v < 21.2.24	21.2.24

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