{"id":"CVE-2026-40426","kind":"vulnerability","aliases":["CVE-2026-40426"],"related":[],"title":"Intel NPU Driver: integer underflow lets a local user crash the system","description":"Integer underflow (wrap or wraparound) for the Intel(R) NPU Driver software before version 1.33.0 within Ring 3: User Applications may allow a denial of service. Unprivileged software adversary with an authenticated user combined with a low complexity attack may enable denial of service. This result may potentially occur via local access when attack requirements are present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (low), integrity (low) and availability (high) of the vulnerable system, resulting in subsequent system confidentiality (none), integrity (none) and availability (none) impacts.","summary":"The Intel NPU Driver before version 1.33.0 has an integer underflow reachable from Ring 3 user applications. A local, authenticated user can trigger a denial of service that takes the system down.","severity":"medium","cvss":5.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["intel-npu","linux","vendor","windows"],"not_affected_if":["driver-1.33.0-or-later","no-intel-npu"],"how_to_check":"- Check the installed Intel NPU Driver version on Windows or Linux systems with an Intel NPU and confirm whether it is below `1.33.0`.","fix":"- Intel NPU Driver: move to `1.33.0` or later.","status":"open","published_at":"2026-11-10T17:17:42+00:00","first_seen_at":"2026-11-10T17:22:43+00:00","triaged_at":"2026-11-10T17:24:19+00:00","updated_at":"2026-11-10T17:24:19+00:00","category":"vendor","confidence":0.6,"triage":{"at":"2026-11-10T17:24:19Z","model":"claude-haiku-5-5","output":{"fix":"- Intel NPU Driver: move to `1.33.0` or later.","reach":"local","title":"Intel NPU Driver: integer underflow lets a local user crash the system","impact":"low","summary":"The Intel NPU Driver before version 1.33.0 has an integer underflow reachable from Ring 3 user applications. A local, authenticated user can trigger a denial of service that takes the system down.","audience":"businesses","category":"vendor","nicknames":[],"who_cares":["intel-npu","windows","linux"],"confidence":0.6,"fix_status":"available","needs_auth":"yes","worst_case":"local user crashes the system through denial of service","analyst_note":"","how_to_check":"- Check the installed Intel NPU Driver version on Windows or Linux systems with an Intel NPU and confirm whether it is below `1.33.0`.","plain_action":"","product_name":"","needs_analyst":false,"not_affected_if":["no-intel-npu","driver-1.33.0-or-later"],"who_is_affected":"Systems with an Intel NPU and an Intel NPU Driver older than `1.33.0`. Exposure requires a local authenticated user running an application that reaches the driver. Machines without an Intel NPU, or with the driver at `1.33.0` or later, can skip it.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000706,"input_tokens":4669,"output_tokens":478,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':14A,17A '-40426':15A,18A '1.33.0':31B,70C '3':39B,73C 'access':107C 'adversari':84C 'allow':77C 'applic':41B,75C 'attack':94C,109C 'authent':44B,87C 'avail':133C,148C 'combin':89C 'complex':93C 'confidenti':128C,143C 'crash':10A 'cve':13A,16A 'denial':49B,79C,97C 'driver':3A,28B,66C 'enabl':96C 'high':134C 'impact':126C,150C 'integ':4A,34B,56C 'integr':130C,145C 'intel':1A,20B,26B,63C 'intel-npu':19B 'interact':121C 'intern':115C 'knowledg':116C 'let':6A 'linux':22B 'local':8A,43B,106C 'low':92C,129C,131C 'may':76C,95C,102C,125C 'none':144C,146C,149C 'npu':2A,21B,27B,65C 'occur':104C 'potenti':103C,123C 'present':112C 'r':64C 'reachabl':36B 'requir':110C,118C 'result':101C,139C 'ring':38B,72C 'servic':51B,81C,99C 'softwar':67C,83C 'special':114C 'subsequ':141C 'system':12A,55B,138C,142C 'take':53B 'trigger':47B 'underflow':5A,35B,57C 'unprivileg':82C 'user':9A,40B,45B,74C,88C,120C 'vendor':23B 'version':30B,69C 'via':105C 'vulner':124C,137C 'window':24B 'within':71C 'without':113C 'wrap':58C 'wraparound':60C","nicknames":[],"mitigations":[],"who_affected":"Systems with an Intel NPU and an Intel NPU Driver older than `1.33.0`. Exposure requires a local authenticated user running an application that reaches the driver. Machines without an Intel NPU, or with the driver at `1.33.0` or later, can skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["intelnpu","linux","medium","vendor","windows"],"campaign_type":null,"search_a":"'-2026':14A,17A '-40426':15A,18A 'crash':10A 'cve':13A,16A 'driver':3A 'integ':4A 'intel':1A 'let':6A 'local':8A 'npu':2A 'system':12A 'underflow':5A 'user':9A","search_b":"'1.33.0':31B '3':39B 'applic':41B 'authent':44B 'denial':49B 'driver':28B 'integ':34B 'intel':20B,26B 'intel-npu':19B 'linux':22B 'local':43B 'npu':21B,27B 'reachabl':36B 'ring':38B 'servic':51B 'system':55B 'take':53B 'trigger':47B 'underflow':35B 'user':40B,45B 'vendor':23B 'version':30B 'window':24B","search_c":"'1.33.0':70C '3':73C 'access':107C 'adversari':84C 'allow':77C 'applic':75C 'attack':94C,109C 'authent':87C 'avail':133C,148C 'combin':89C 'complex':93C 'confidenti':128C,143C 'denial':79C,97C 'driver':66C 'enabl':96C 'high':134C 'impact':126C,150C 'integ':56C 'integr':130C,145C 'intel':63C 'interact':121C 'intern':115C 'knowledg':116C 'local':106C 'low':92C,129C,131C 'may':76C,95C,102C,125C 'none':144C,146C,149C 'npu':65C 'occur':104C 'potenti':103C,123C 'present':112C 'r':64C 'requir':110C,118C 'result':101C,139C 'ring':72C 'servic':81C,99C 'softwar':67C,83C 'special':114C 'subsequ':141C 'system':138C,142C 'underflow':57C 'unprivileg':82C 'user':74C,88C,120C 'version':69C 'via':105C 'vulner':124C,137C 'within':71C 'without':113C 'wrap':58C 'wraparound':60C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T17:17:42+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/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:X/U:X","cvss_by":"secure@intel.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-40426","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40426","severity":null,"published_at":"2026-11-10T17:17:42+00:00","modified_at":"2026-11-10T17:17:42+00:00","first_seen_at":"2026-11-10T17:22:43+00:00","fetched_at":"2026-11-10T17:22:43+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"}