CVE-2026-56000

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.

CVSS v3 7.8 HIGH

7.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://gitlab.freedesktop.org/xorg/xserver/-/commit/2779affbdb4354e894f490e56f962527d6125043	Patch
https://www.openwall.com/lists/oss-security/2026/07/08/2	Mailing List Patch Third Party Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:x.org:x_server::::::::
	cpe:2.3:a:x.org:xwayland::::::::

History

09 Jul 2026, 19:47

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 7.8
CPE		cpe:2.3:a:x.org:xwayland:::::::: cpe:2.3:a:x.org:x_server::::::::
First Time		X.org xwayland X.org X.org x Server
References	~~() https://gitlab.freedesktop.org/xorg/xserver/-/commit/2779affbdb4354e894f490e56f962527d6125043 -~~	() https://gitlab.freedesktop.org/xorg/xserver/-/commit/2779affbdb4354e894f490e56f962527d6125043 - Patch
References	~~() https://www.openwall.com/lists/oss-security/2026/07/08/2 -~~	() https://www.openwall.com/lists/oss-security/2026/07/08/2 - Mailing List, Patch, Third Party Advisory

08 Jul 2026, 09:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-07-08 09:16

Updated : 2026-07-09 19:47

NVD link : CVE-2026-56000

Mitre link : CVE-2026-56000

CVE.ORG link : CVE-2026-56000

JSON object : View

Products Affected

x.org

x_server
xwayland

CWE

CWE-416

Use After Free

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