CVE-2026-23763

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The driver allocates a 128-byte non-paged pool buffer and, upon receiving IOCTL 0x222060, maps it into user space using an MDL and MmMapLockedPagesSpecifyCache. Because the allocation size is not page-aligned, the mapping exposes the entire 0x1000-byte kernel page containing the buffer plus adjacent non-paged pool allocations with read/write permissions. An unprivileged local attacker can open a device handle (using the required 0x800 attribute flag), invoke the IOCTL to obtain the mapping, and then read or modify live kernel objects and pointers present on that page. This enables bypass of KASLR, arbitrary kernel memory read/write within the exposed page, corruption of kernel objects, and escalation to SYSTEM."}], "value": "VB-Audio Matrix and Matrix Coconut (versions ending in 1.0.2.2 and 2.0.2.2 and earlier, respectively), contain a local privilege escalation vulnerability in the VBMatrix VAIO virtual audio driver (vbmatrixvaio64*_win10.sys). 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The driver allocates a 128-byte non-paged pool buffer and, upon receiving IOCTL 0x222060, maps it into user space using an MDL and MmMapLockedPagesSpecifyCache. Because the allocation size is not page-aligned, the mapping exposes the entire 0x1000-byte kernel page containing the buffer plus adjacent non-paged pool allocations with read/write permissions. An unprivileged local attacker can open a device handle (using the required 0x800 attribute flag), invoke the IOCTL to obtain the mapping, and then read or modify live kernel objects and pointers present on that page. This enables bypass of KASLR, arbitrary kernel memory read/write within the exposed page, corruption of kernel objects, and escalation to SYSTEM.", "supportingMedia": [{"type": "text/html", "value": "VB-Audio Matrix and Matrix Coconut (versions ending in 1.0.2.2 and 2.0.2.2 and earlier, respectively), contain a local privilege escalation vulnerability in the VBMatrix VAIO virtual audio driver (vbmatrixvaio64*_win10.sys). The driver allocates a 128-byte non-paged pool buffer and, upon receiving IOCTL 0x222060, maps it into user space using an MDL and MmMapLockedPagesSpecifyCache. Because the allocation size is not page-aligned, the mapping exposes the entire 0x1000-byte kernel page containing the buffer plus adjacent non-paged pool allocations with read/write permissions. An unprivileged local attacker can open a device handle (using the required 0x800 attribute flag), invoke the IOCTL to obtain the mapping, and then read or modify live kernel objects and pointers present on that page. 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "modules": ["vbmatrixvaio64*_win10.sys"], "platforms": ["Windows"], "product": "Matrix", "vendor": "VB-Audio Software", "versions": [{"lessThanOrEqual": "1.0.2.2", "status": "affected", "version": "0", "versionType": "custom"}]}, {"defaultStatus": "unaffected", "modules": ["vbmatrixvaio64*_win10.sys"], "platforms": ["Windows"], "product": "Matrix Coconut", "vendor": "VB-Audio Software", "versions": [{"lessThanOrEqual": "2.0.2.2", "status": "affected", "version": "0", "versionType": "custom"}]}], "source": "disclosure@vulncheck.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "VB-Audio Matrix and Matrix Coconut (versions ending in 1.0.2.2 and 2.0.2.2 and earlier, respectively), contain a local privilege escalation vulnerability in the VBMatrix VAIO virtual audio driver (vbmatrixvaio64*_win10.sys). The driver allocates a 128-byte non-paged pool buffer and, upon receiving IOCTL 0x222060, maps it into user space using an MDL and MmMapLockedPagesSpecifyCache. Because the allocation size is not page-aligned, the mapping exposes the entire 0x1000-byte kernel page containing the buffer plus adjacent non-paged pool allocations with read/write permissions. An unprivileged local attacker can open a device handle (using the required 0x800 attribute flag), invoke the IOCTL to obtain the mapping, and then read or modify live kernel objects and pointers present on that page. This enables bypass of KASLR, arbitrary kernel memory read/write within the exposed page, corruption of kernel objects, and escalation to SYSTEM."}, {"lang": "es", "value": "VB-Audio Matrix y Matrix Coconut (versiones que terminan en 1.0.2.2 y 2.0.2.2 y anteriores, respectivamente), contienen una vulnerabilidad de escalada de privilegios local en el controlador de audio virtual VBMatrix VAIO (vbmatrixvaio64*_win10.sys). El controlador asigna un b\u00fafer de grupo no paginado de 128 bytes y, al recibir el IOCTL 0x222060, lo mapea en el espacio de usuario utilizando un MDL y MmMapLockedPagesSpecifyCache. Debido a que el tama\u00f1o de la asignaci\u00f3n no est\u00e1 alineado con la p\u00e1gina, el mapeo expone toda la p\u00e1gina del kernel de 0x1000 bytes que contiene el b\u00fafer m\u00e1s asignaciones adyacentes del grupo no paginado con permisos de lectura/escritura. Un atacante local sin privilegios puede abrir un identificador de dispositivo (utilizando el indicador de atributo 0x800 requerido), invocar el IOCTL para obtener el mapeo, y luego leer o modificar objetos y punteros del kernel en vivo presentes en esa p\u00e1gina. Esto permite el bypass de KASLR, lectura/escritura arbitraria de memoria del kernel dentro de la p\u00e1gina expuesta, corrupci\u00f3n de objetos del kernel, y escalada a SYSTEM."}], "id": "CVE-2026-23763", "lastModified": "2026-06-17T10:22:04.437", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "LOCAL", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.5, "baseSeverity": "HIGH", "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:H/VI:H/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": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "disclosure@vulncheck.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-23763", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-01-22T18:25:12.529261Z", "version": "2.0.3"}}]}, "published": "2026-01-22T17:16:37.620", "references": [{"source": "disclosure@vulncheck.com", "url": "https://forum.vb-audio.com/viewtopic.php?p=7527#p7527"}, {"source": "disclosure@vulncheck.com", "url": "https://forum.vb-audio.com/viewtopic.php?p=7574#p7574"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/emkaix/security-research/tree/main/CVE-2026-23763"}, {"source": "disclosure@vulncheck.com", "url": "https://vb-audio.com/"}, {"source": "disclosure@vulncheck.com", "url": "https://www.vulncheck.com/advisories/vb-audio-matrix-drivers-local-privilege-escalation-via-kernel-memory-exposure"}], "sourceIdentifier": "disclosure@vulncheck.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-668"}], "source": "disclosure@vulncheck.com", "type": "Secondary"}]}

{}

{"analysis": {"en": {"generated_at": "2026-04-16T17:59:37.622609+00:00", "value": {"mitigation_remediation": ["Upgrade VB\u2011Audio Matrix and Matrix Coconut to a version newer than 1.0.2.2 and 2.0.2.2.", "Disable the VB\u2011Audio Matrix drivers if the functionality is not required for the system.", "Monitor local processes for unusual device access and enforce the principle of least privilege for driver installation."], "summary": {"action": "Apply Patch", "impact": "Local Privilege Escalation via kernel memory exposure"}, "threat_synthesis": {"affected_systems": "VB\u2011Audio Software Matrix (versions ending in\u202f1.0.2.2 and earlier) and Matrix Coconut (versions ending in\u202f2.0.2.2 and earlier) on Windows are affected. The vulnerability is limited to the driver vbmatrixvaio64*_win10.sys.", "description_and_impact": "VB\u2011Audio Matrix and Matrix Coconut drivers contain a flaw in the vbmatrixvaio64.sys kernel device. The driver allocates a 128\u2011byte buffer in non\u2011paged pool and, when an attacker sends IOCTL\u202f0x222060, maps that buffer into user space with MmMapLockedPagesSpecifyCache. Because the allocation size is not page aligned, the mapping exposes the entire 4\u202fKiB kernel page, leaking adjacent non\u2011paged pool objects. An attacker with local access can read or write kernel memory on that page, corrupt kernel objects, bypass KASLR, and ultimately gain SYSTEM privileges. This is an improper access control weakness (CWE\u2011668).", "risk_and_exploitability": "The CVSS score of 8.5 indicates high severity, but the EPSS score is less than 1\u202f%, showing a very low probability of exploitation at present. The vulnerability is not listed in the CISA KEV catalog. Exploitation requires local execution, the ability to open the driver with the 0x800 flag, and to invoke the specific IOCTL. Once executed, the kernel page is mapped into user space, providing arbitrary read/write to that page, allowing manipulation of kernel pointers, corruption of objects, and escalation to SYSTEM."}}}}, "created": "2026-01-23T16:32:15.911417+00:00", "updated": "2026-04-16T18:00:11.191254+00:00", "vendors": ["vb-audio_software", "vb-audio_software$PRODUCT$matrix", "vb-audio_software$PRODUCT$matrix_coconut"]}