CVE-2026-56000 | Local attackers with a X connection able to provide GLX comm… | CVSS 9.0 CRITICAL

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.

Metadata

CVE ID: CVE-2026-56000
State: PUBLISHED
Assigner: suse
Reserved: 2026-06-18 09:26 UTC
Published: 2026-07-08 07:36 UTC
Last updated: 2026-07-08 12:42 UTC
Primary CWE: CWE-416
CWE-416 Use after free
Vendor / Product: X.Org / xorg-x11-server
Sources: cve.org · NVD

Severity & Metrics

9.0 CRITICAL CVSS 4.0

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

SSVC — CISA Coordinator

Exploitation: none
Automatable: no
Tech. Impact: total

Affected products (2)

Vendor	Product	Platform	Versions
X.Org	xorg-x11-server	—	0 < 21.1.24
X.Org	xwayland	—	0 < 24.1.13

Weakness (CWE)

CWE	Source	Description
CWE-416	cna	CWE-416 Use after free

CVSS scores (1)

Score	Severity	Version	Source	Vector
9.0	CRITICAL	4.0	cna	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

References (2)