CVE-2026-56000

xorg-x11-server / xwayland GLX contextTags Use-After-Free in CommonMakeCurrent()

State: Published
Severity: 9.0 Critical
Published: Jul 8, 2026
Updated: Jul 8, 2026
Reserved: Jun 18, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	9.0 Critical	CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H	suse

Weaknesses

CWE-416 Use after free

Affected Products

Product	Versions
xorg-x11-serverX.Org	before 21.1.24Affected
xwaylandX.Org	before 24.1.13Affected

References

https://gitlab.freedesktop.org/xorg/xserver/-/commit/2779affbdb4354e894f490e56f962527d6125043patch
https://www.openwall.com/lists/oss-security/2026/07/08/2vendor-advisory

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