CVE-2026-56000 - Vulnerability Details - OpenCVE

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.

Attack Vector Network

Attack Complexity High

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact High

Subsequent System Integrity Impact High

Subsequent System Availability Impact High

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

No data.

No data.

No data.

No data.

References

Link	Providers
https://gitlab.freedesktop.org/xorg/xserver/-/commit/2779affbdb4354e894f490e56f962527d6125043
https://www.openwall.com/lists/oss-security/2026/07/08/2

History

Wed, 08 Jul 2026 08:30:00 +0000

Type	Values Removed	Values Added
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.
Title		xorg-x11-server / xwayland GLX contextTags Use-After-Free in CommonMakeCurrent()
Weaknesses		CWE-416
References		https://gitlab.freedesktop.org/xorg/xserver/-/commit/2779affbdb4354e894f490e56f962527d6125043 https://www.openwall.com/lists/oss-security/2026/07/08/2
Metrics		cvssV4_0 `{'score': 9, 'vector': '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'}`

MITRE

Status: PUBLISHED

Assigner: suse

Published: 2026-07-08T07:36:15.357Z

Updated: 2026-07-08T08:12:50.380Z

Reserved: 2026-06-18T09:26:55.988Z

Link: CVE-2026-56000

Vulnrichment

No data.

NVD

No data.

Redhat

No data.

OpenCVE Enrichment

No data.

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-56000", "assignerOrgId": "404e59f5-483d-4b8a-8e7a-e67604dd8afb", "state": "PUBLISHED", "assignerShortName": "suse", "dateReserved": "2026-06-18T09:26:55.988Z", "datePublished": "2026-07-08T07:36:15.357Z", "dateUpdated": "2026-07-08T08:12:50.380Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "404e59f5-483d-4b8a-8e7a-e67604dd8afb", "shortName": "suse", "dateUpdated": "2026-07-08T08:12:50.380Z"}, "title": "xorg-x11-server / xwayland GLX contextTags Use-After-Free in CommonMakeCurrent()", "datePublic": "2026-07-08T07:30:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-416", "description": "CWE-416 Use after free", "type": "CWE"}]}], "impacts": [{"capecId": "CAPEC-234", "descriptions": [{"lang": "en", "value": "CAPEC-234 Hijacking a privileged process"}]}], "affected": [{"vendor": "X.Org", "product": "xorg-x11-server", "packageName": "xorg-x11-server", "repo": "https://gitlab.freedesktop.org/xorg/xserver/", "versions": [{"status": "affected", "version": "0", "lessThan": "21.1.24", "versionType": "rpm"}], "defaultStatus": "unaffected"}, {"vendor": "X.Org", "product": "xwayland", "packageName": "xwayland", "repo": "https://gitlab.freedesktop.org/xorg/xserver/", "versions": [{"status": "affected", "version": "0", "lessThan": "24.1.13", "versionType": "rpmver"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "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\u00a0CommonMakeCurrent() pointing into potentially reallocated memory.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "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."}]}], "references": [{"url": "https://gitlab.freedesktop.org/xorg/xserver/-/commit/2779affbdb4354e894f490e56f962527d6125043", "tags": ["patch"]}, {"url": "https://www.openwall.com/lists/oss-security/2026/07/08/2", "tags": ["vendor-advisory"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "HIGH", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "HIGH", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "CRITICAL", "baseScore": 9, "vectorString": "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"}}], "credits": [{"lang": "en", "value": "Anonymous working with Trend Micro Zero Day Initiative.", "type": "finder"}], "source": {"discovery": "EXTERNAL"}, "x_generator": {"engine": "Vulnogram 1.0.2"}}}}