{"id":"CVE-2026-56759","kind":"vulnerability","aliases":["CVE-2026-56759"],"related":[],"title":"Intel TDX MigTD: PCI BAR input validation flaw allows privilege escalation locally","description":"Improper input validation in the MigTD PCI BAR handling for the Intel(R) TDX Migration Trust Domain (MigTD) within Ring 0: Hypervisor may allow an escalation of privilege. System software adversary with a privileged user combined with a low complexity attack may enable data corruption. This result may potentially occur via local 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 (high) and availability (none) of the vulnerable system, resulting in subsequent system confidentiality (none), integrity (none) and availability (none) impacts.","summary":"Intel's MigTD component of the TDX Migration Trust Domain has an input validation flaw in PCI BAR handling that can let a privileged system software adversary escalate privilege or corrupt data. An attacker needs local access and a privileged user position, and the sources report high integrity impact with no confidentiality or availability impact.","severity":"medium","cvss":6.7,"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":"2026-11-10T18:17:41+00:00","first_seen_at":"2026-11-10T18:22:59+00:00","triaged_at":"2026-11-10T18:24:49+00:00","updated_at":"2026-11-10T18:24:49+00:00","category":"infrastructure","confidence":0.4,"triage":{"at":"2026-11-10T18:24:49Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Intel TDX MigTD: PCI BAR input validation flaw allows privilege escalation locally","impact":"high","summary":"Intel's MigTD component of the TDX Migration Trust Domain has an input validation flaw in PCI BAR handling that can let a privileged system software adversary escalate privilege or corrupt data. An attacker needs local access and a privileged user position, and the sources report high integrity impact with no confidentiality or availability impact.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["intel-tdx","migtd","hypervisor","confidential-computing"],"confidence":0.4,"fix_status":"unknown","needs_auth":"yes","worst_case":"local privileged attacker corrupts data and escalates privilege","analyst_note":"Find Intel's security advisory for CVE-2026-56759 to get affected MigTD versions, fixed releases and mitigation settings; NVD text alone does not give them.","how_to_check":"- unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["no-tdx-migration"],"who_is_affected":"Affects hosts running Intel TDX with the MigTD migration trust domain in a Ring 0 hypervisor context, according to the NVD description. Systems without TDX live migration via MigTD are not described as affected. The sources do not give version ranges or a vendor advisory link.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"yes","severity_if_unknown":"unknown"},"cost_usd":0.000732,"input_tokens":4675,"output_tokens":529,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':14A,17A '-56759':15A,18A '0':103C 'access':64B,135C 'adversari':54B,113C 'allow':9A,106C 'attack':61B,123C,137C 'avail':81B,162C,177C 'bar':5A,45B,90C 'combin':118C 'complex':122C 'compon':31B 'comput':21B 'confidenti':20B,79B,157C,172C 'confidential-comput':19B 'corrupt':58B,127C 'cve':13A,16A 'data':59B,126C 'domain':37B,99C 'enabl':125C 'escal':11A,55B,108C 'flaw':8A,42B 'handl':46B,91C 'high':74B,160C 'hypervisor':22B,104C 'impact':76B,82B,155C,179C 'improp':83C 'infrastructur':23B 'input':6A,40B,84C 'integr':75B,159C,174C 'intel':1A,25B,28B,94C 'intel-tdx':24B 'interact':150C 'intern':144C 'knowledg':145C 'let':49B 'local':12A,63B,134C 'low':121C 'may':105C,124C,130C,154C 'migrat':35B,97C 'migtd':3A,27B,30B,88C,100C 'need':62B 'none':158C,163C,173C,175C,178C 'occur':132C 'pci':4A,44B,89C 'posit':69B 'potenti':131C,152C 'present':141C 'privileg':10A,51B,56B,67B,110C,116C 'r':95C 'report':73B 'requir':138C,147C 'result':129C,168C 'ring':102C 'softwar':53B,112C 'sourc':72B 'special':143C 'subsequ':170C 'system':52B,111C,167C,171C 'tdx':2A,26B,34B,96C 'trust':36B,98C 'user':68B,117C,149C 'valid':7A,41B,85C 'via':133C 'vulner':153C,166C 'within':101C 'without':142C","nicknames":[],"mitigations":[],"who_affected":"Affects hosts running Intel TDX with the MigTD migration trust domain in a Ring 0 hypervisor context, according to the NVD description. Systems without TDX live migration via MigTD are not described as affected. The sources do not give version ranges or a vendor advisory link.","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':14A,17A '-56759':15A,18A 'allow':9A 'bar':5A 'cve':13A,16A 'escal':11A 'flaw':8A 'input':6A 'intel':1A 'local':12A 'migtd':3A 'pci':4A 'privileg':10A 'tdx':2A 'valid':7A","search_b":"'access':64B 'adversari':54B 'attack':61B 'avail':81B 'bar':45B 'compon':31B 'comput':21B 'confidenti':20B,79B 'confidential-comput':19B 'corrupt':58B 'data':59B 'domain':37B 'escal':55B 'flaw':42B 'handl':46B 'high':74B 'hypervisor':22B 'impact':76B,82B 'infrastructur':23B 'input':40B 'integr':75B 'intel':25B,28B 'intel-tdx':24B 'let':49B 'local':63B 'migrat':35B 'migtd':27B,30B 'need':62B 'pci':44B 'posit':69B 'privileg':51B,56B,67B 'report':73B 'softwar':53B 'sourc':72B 'system':52B 'tdx':26B,34B 'trust':36B 'user':68B 'valid':41B","search_c":"'0':103C 'access':135C 'adversari':113C 'allow':106C 'attack':123C,137C 'avail':162C,177C 'bar':90C 'combin':118C 'complex':122C 'confidenti':157C,172C 'corrupt':127C 'data':126C 'domain':99C 'enabl':125C 'escal':108C 'handl':91C 'high':160C 'hypervisor':104C 'impact':155C,179C 'improp':83C 'input':84C 'integr':159C,174C 'intel':94C 'interact':150C 'intern':144C 'knowledg':145C 'local':134C 'low':121C 'may':105C,124C,130C,154C 'migrat':97C 'migtd':88C,100C 'none':158C,163C,173C,175C,178C 'occur':132C 'pci':89C 'potenti':131C,152C 'present':141C 'privileg':110C,116C 'r':95C 'requir':138C,147C 'result':129C,168C 'ring':102C 'softwar':112C 'special':143C 'subsequ':170C 'system':111C,167C,171C 'tdx':96C 'trust':98C 'user':117C,149C 'valid':85C 'via':133C 'vulner':153C,166C 'within':101C 'without':142C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T18:17:41+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:N/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-2026-56759","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-56759","severity":null,"published_at":"2026-11-10T18:17:41+00:00","modified_at":"2026-11-10T18:17:41+00:00","first_seen_at":"2026-11-10T18:22:59+00:00","fetched_at":"2026-11-10T18:22:59+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"}