CVE-2026-109904 - Vulnerability Details - OpenCVE

A buffer overread caused by an integer-overflow in Proc/SProcXResQueryClientIds in X.Org xwayland before 24.1.15 and X Server before 21.1.26 could be used by attackers on authenticated X clients to crash the server or leak out information.

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

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.

Vendors	Products
X.org Subscribe	Xorg-x11-server Subscribe Xwayland Subscribe

No data.

No data.

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References

Link	Providers
https://gitlab.freedesktop.org/xorg/xserver/-/commit/ff754b812597177412f2e2fa2b1dd1eecbeb75cf

History

Fri, 13 Nov 2026 10:45:00 +0000

Type	Values Removed	Values Added
Description		A buffer overread caused by an integer-overflow in Proc/SProcXResQueryClientIds in X.Org xwayland before 24.1.15 and X Server before 21.1.26 could be used by attackers on authenticated X clients to crash the server or leak out information.
Title		X.Org Server XRes QueryClientIds Request Size Overflow
First Time appeared		X.org X.org xorg-x11-server X.org xwayland
Weaknesses		CWE-126
CPEs		cpe:2.3:a:x.org:xorg-x11-server:::::::: cpe:2.3:a:x.org:xwayland::::::::
Vendors & Products		X.org X.org xorg-x11-server X.org xwayland
References		https://gitlab.freedesktop.org/xorg/xserver/-/commit/ff754b812597177412f2e2fa2b1dd1eecbeb75cf
Metrics		cvssV4_0 `{'score': 6.9, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N'}`

Projects

Sign in to view the affected projects.

MITRE

Status: PUBLISHED

Assigner: suse

Published: 2026-11-13T10:27:48.418Z

Updated: 2026-11-13T10:27:48.418Z

Reserved: 2026-10-13T09:50:30.690Z

Link: CVE-2026-109904

Vulnrichment

No data.

NVD

Status : Awaiting Analysis

Published: 2026-11-13T11:17:15.677

Modified: 2026-11-13T11:17:15.783

Link: CVE-2026-109904

Redhat

No data.

OpenCVE Enrichment

No data.

Weaknesses

CWE-126

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-109904", "assignerOrgId": "404e59f5-483d-4b8a-8e7a-e67604dd8afb", "state": "PUBLISHED", "assignerShortName": "suse", "dateReserved": "2026-10-13T09:50:30.690Z", "datePublished": "2026-11-13T10:27:48.418Z", "dateUpdated": "2026-11-13T10:27:48.418Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "404e59f5-483d-4b8a-8e7a-e67604dd8afb", "shortName": "suse", "dateUpdated": "2026-11-13T10:27:48.418Z"}, "title": "X.Org Server XRes QueryClientIds Request Size Overflow", "datePublic": "2026-11-13T10:18:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-126", "description": "CWE-126 Buffer over-read", "type": "CWE"}]}], "impacts": [{"capecId": "CAPEC-540", "descriptions": [{"lang": "en", "value": "CAPEC-540 Overread Buffers"}]}], "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": "21.1.26", "versionType": "rpm"}], "defaultStatus": "unaffected"}, {"vendor": "X.Org", "product": "xwayland", "packageName": "xwayland", "repo": "https://gitlab.freedesktop.org/xorg/xserver/", "versions": [{"status": "affected", "version": "0", "lessThan": "24.1.15", "versionType": "rpm"}], "defaultStatus": "unaffected"}], "cpeApplicability": [{"operator": "OR", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:x.org:xorg-x11-server:*:*:*:*:*:*:*:*", "versionStartIncluding": "0", "versionEndExcluding": "21.1.26"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:x.org:xwayland:*:*:*:*:*:*:*:*", "versionStartIncluding": "0", "versionEndExcluding": "24.1.15"}]}]}], "descriptions": [{"lang": "en", "value": "A buffer overread caused by an integer-overflow in\u00a0Proc/SProcXResQueryClientIds in X.Org xwayland before 24.1.15 and X Server before 21.1.26 could be used by attackers on authenticated X clients to crash the server or leak out information.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "A buffer overread caused by an integer-overflow in <span>Proc/SProcXResQueryClientIds in X.Org xwayland before 24.1.15 and X Server before 21.1.26 could be used by attackers on authenticated X clients to crash the server or leak out information.</span>"}]}], "references": [{"url": "https://gitlab.freedesktop.org/xorg/xserver/-/commit/ff754b812597177412f2e2fa2b1dd1eecbeb75cf", "tags": ["patch"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "NONE", "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": "MEDIUM", "baseScore": 6.9, "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N"}}], "credits": [{"lang": "en", "value": "Acts1631 <[email protected]>", "type": "finder"}], "source": {"discovery": "EXTERNAL"}, "x_generator": {"engine": "Vulnogram 1.0.5"}}}}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "packageName": "xorg-x11-server", "product": "xorg-x11-server", "repo": "https://gitlab.freedesktop.org/xorg/xserver/", "vendor": "X.Org", "versions": [{"lessThan": "21.1.26", "status": "affected", "version": "0", "versionType": "rpm"}]}, {"defaultStatus": "unaffected", "packageName": "xwayland", "product": "xwayland", "repo": "https://gitlab.freedesktop.org/xorg/xserver/", "vendor": "X.Org", "versions": [{"lessThan": "24.1.15", "status": "affected", "version": "0", "versionType": "rpm"}]}], "source": "[email protected]"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A buffer overread caused by an integer-overflow in\u00a0Proc/SProcXResQueryClientIds in X.Org xwayland before 24.1.15 and X Server before 21.1.26 could be used by attackers on authenticated X clients to crash the server or leak out information."}], "id": "CVE-2026-109904", "lastModified": "2026-11-13T11:17:15.783", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "LOCAL", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.9, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "[email protected]", "type": "Secondary"}]}, "published": "2026-11-13T11:17:15.677", "references": [{"source": "[email protected]", "url": "https://gitlab.freedesktop.org/xorg/xserver/-/commit/ff754b812597177412f2e2fa2b1dd1eecbeb75cf"}], "sourceIdentifier": "[email protected]", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-126"}], "source": "[email protected]", "type": "Primary"}]}