{"id":"CVE-2026-63027","kind":"vulnerability","aliases":["CVE-2026-63027"],"related":[],"title":"Intel TDX MigTD: incorrect check order lets a hypervisor cause denial of service","description":"Incorrect behavior order in the get_tcb_level_by_svn for the Intel(R) TDX Migration Trust Domain (MigTD) within Ring 0: Hypervisor may allow a denial of service. Network adversary with an unauthenticated user combined with a low complexity attack may enable denial of service. This result may potentially occur via adjacent access when attack requirements are not present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (none), integrity (none) and availability (low) of the vulnerable system, resulting in subsequent system confidentiality (none), integrity (none) and availability (none) impacts.","summary":"A flaw in how the Intel TDX Migration Trust Domain (MigTD) handles TCB level checks by SVN can let a hypervisor-adjacent attacker cause a denial of service. The sources describe only an availability impact, with no confidentiality or integrity loss.","severity":"medium","cvss":5.3,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["confidential-computing","hypervisor","infrastructure","intel-tdx","migtd"],"not_affected_if":["no-tdx-migration"],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T18:17:45+00:00","first_seen_at":"2026-11-10T18:23:00+00:00","triaged_at":"2026-11-10T18:25:16+00:00","updated_at":"2026-11-10T18:25:16+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-11-10T18:25:16Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"unknown","title":"Intel TDX MigTD: incorrect check order lets a hypervisor cause denial of service","impact":"low","summary":"A flaw in how the Intel TDX Migration Trust Domain (MigTD) handles TCB level checks by SVN can let a hypervisor-adjacent attacker cause a denial of service. The sources describe only an availability impact, with no confidentiality or integrity loss.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["intel-tdx","migtd","confidential-computing","hypervisor"],"confidence":0.5,"fix_status":"unknown","needs_auth":"unknown","worst_case":"Denial of service against the migration trust domain","analyst_note":"Check Intel's security advisory for affected MigTD versions, fixed versions and mitigation settings.","how_to_check":"- unknown","plain_action":"","product_name":"Intel TDX MigTD","needs_analyst":true,"not_affected_if":["no-tdx-migration"],"who_is_affected":"Intended for teams running Intel TDX confidential computing with the MigTD migration component inside Ring 0 hypervisor environments. The sources do not name affected MigTD versions or describe the exact configuration needed. Teams not using Intel TDX live migration can likely skip it.","user_interaction":"no","product_ecosystem":"vendor","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000726,"input_tokens":4687,"output_tokens":515,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':15A,18A '-63027':16A,19A '0':92C 'access':124C 'adjac':51B,123C 'adversari':101C 'allow':95C 'attack':52B,111C,126C 'avail':63B,151C,166C 'behavior':72C 'caus':10A,53B 'check':5A,43B 'combin':106C 'complex':110C 'comput':22B 'confidenti':21B,67B,146C,161C 'confidential-comput':20B 'cve':14A,17A 'denial':11A,55B,97C,114C 'describ':60B 'domain':38B,88C 'enabl':113C 'flaw':30B 'get':76C 'handl':40B 'hypervisor':9A,23B,50B,93C 'hypervisor-adjac':49B 'impact':64B,144C,168C 'incorrect':4A,71C 'infrastructur':24B 'integr':69B,148C,163C 'intel':1A,26B,34B,83C 'intel-tdx':25B 'interact':139C 'intern':133C 'knowledg':134C 'let':7A,47B 'level':42B,78C 'loss':70B 'low':109C,152C 'may':94C,112C,119C,143C 'migrat':36B,86C 'migtd':3A,28B,39B,89C 'network':100C 'none':147C,149C,162C,164C,167C 'occur':121C 'order':6A,73C 'potenti':120C,141C 'present':130C 'r':84C 'requir':127C,136C 'result':118C,157C 'ring':91C 'servic':13A,57B,99C,116C 'sourc':59B 'special':132C 'subsequ':159C 'svn':45B,80C 'system':156C,160C 'tcb':41B,77C 'tdx':2A,27B,35B,85C 'trust':37B,87C 'unauthent':104C 'user':105C,138C 'via':122C 'vulner':142C,155C 'within':90C 'without':131C","nicknames":[],"mitigations":[],"who_affected":"Intended for teams running Intel TDX confidential computing with the MigTD migration component inside Ring 0 hypervisor environments. The sources do not name affected MigTD versions or describe the exact configuration needed. Teams not using Intel TDX live migration can likely skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["confidentialcomputing","hypervisor","infrastructure","inteltdx","medium","migtd"],"campaign_type":null,"search_a":"'-2026':15A,18A '-63027':16A,19A 'caus':10A 'check':5A 'cve':14A,17A 'denial':11A 'hypervisor':9A 'incorrect':4A 'intel':1A 'let':7A 'migtd':3A 'order':6A 'servic':13A 'tdx':2A","search_b":"'adjac':51B 'attack':52B 'avail':63B 'caus':53B 'check':43B 'comput':22B 'confidenti':21B,67B 'confidential-comput':20B 'denial':55B 'describ':60B 'domain':38B 'flaw':30B 'handl':40B 'hypervisor':23B,50B 'hypervisor-adjac':49B 'impact':64B 'infrastructur':24B 'integr':69B 'intel':26B,34B 'intel-tdx':25B 'let':47B 'level':42B 'loss':70B 'migrat':36B 'migtd':28B,39B 'servic':57B 'sourc':59B 'svn':45B 'tcb':41B 'tdx':27B,35B 'trust':37B","search_c":"'0':92C 'access':124C 'adjac':123C 'adversari':101C 'allow':95C 'attack':111C,126C 'avail':151C,166C 'behavior':72C 'combin':106C 'complex':110C 'confidenti':146C,161C 'denial':97C,114C 'domain':88C 'enabl':113C 'get':76C 'hypervisor':93C 'impact':144C,168C 'incorrect':71C 'integr':148C,163C 'intel':83C 'interact':139C 'intern':133C 'knowledg':134C 'level':78C 'low':109C,152C 'may':94C,112C,119C,143C 'migrat':86C 'migtd':89C 'network':100C 'none':147C,149C,162C,164C,167C 'occur':121C 'order':73C 'potenti':120C,141C 'present':130C 'r':84C 'requir':127C,136C 'result':118C,157C 'ring':91C 'servic':99C,116C 'special':132C 'subsequ':159C 'svn':80C 'system':156C,160C 'tcb':77C 'tdx':85C 'trust':87C 'unauthent':104C 'user':105C,138C 'via':122C 'vulner':142C,155C 'within':90C 'without':131C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T18:17:45+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/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","cvss_by":"secure@intel.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-63027","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63027","severity":null,"published_at":"2026-11-10T18:17:45+00:00","modified_at":"2026-11-10T18:17:45+00:00","first_seen_at":"2026-11-10T18:23:00+00:00","fetched_at":"2026-11-10T18:23:00+00:00","note":null}],"documents":[],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}