{"id":"CVE-2026-119385","kind":"vulnerability","aliases":["CVE-2026-119385"],"related":[],"title":"Windows Hyper-V: race condition lets a local user cause denial of service","description":"Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Hyper-V allows an authorized attacker to deny service locally.","summary":"A race condition in how Windows Hyper-V handles a shared resource lets an authorized attacker crash or stall the service locally. The sources do not say whether the attack leads to code execution or data exposure.","severity":"medium","cvss":4.7,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"Windows Hyper-V","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["hyper-v","infrastructure","virtualization","windows"],"not_affected_if":["hyper-v-role-not-enabled"],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:19:52+00:00","first_seen_at":"2026-11-10T19:24:56+00:00","triaged_at":"2026-11-10T20:04:12+00:00","updated_at":"2026-11-10T20:04:12+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-11-10T20:04:12Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Windows Hyper-V: race condition lets a local user cause denial of service","impact":"low","summary":"A race condition in how Windows Hyper-V handles a shared resource lets an authorized attacker crash or stall the service locally. The sources do not say whether the attack leads to code execution or data exposure.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows","hyper-v","virtualization"],"confidence":0.6,"fix_status":"unknown","needs_auth":"yes","worst_case":"Local attacker causes denial of service on the Hyper-V host","analyst_note":"Check the Microsoft Security Response Center entry for CVE-2026-119385 for affected builds and the patch.","how_to_check":"unknown","plain_action":"","product_name":"Windows Hyper-V","needs_analyst":true,"not_affected_if":["hyper-v-role-not-enabled"],"who_is_affected":"Hyper-V is the Windows virtualization feature, so the exposed systems are Windows hosts with the Hyper-V role enabled. The attacker needs to be an authorized user on the local machine, and hosts without Hyper-V can skip it. The sources do not list affected versions or a fix.","user_interaction":"no","product_ecosystem":"vendor","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000694,"input_tokens":4503,"output_tokens":488,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-119385':17A,20A '-2026':16A,19A 'allow':84C 'attack':47B,61B,87C 'author':46B,86C 'caus':11A 'code':64B 'concurr':69C 'condit':6A,33B,78C 'crash':48B 'cve':15A,18A 'data':67B 'deni':89C 'denial':12A 'execut':65B,70C 'exposur':68B 'handl':40B 'hyper':3A,23A,26B,38B,82C 'hyper-v':2A,22A,25B,37B,81C 'improp':75C 'infrastructur':28B 'lead':62B 'let':7A,44B 'local':9A,53B,91C 'race':5A,32B,77C 'resourc':43B,73C 'say':58B 'servic':14A,52B,90C 'share':42B,72C 'sourc':55B 'stall':50B 'synchron':76C 'use':71C 'user':10A 'v':4A,24A,27B,39B,83C 'virtual':29B 'whether':59B 'window':1A,30B,36B,80C 'windows':21A","nicknames":[],"mitigations":[],"who_affected":"Hyper-V is the Windows virtualization feature, so the exposed systems are Windows hosts with the Hyper-V role enabled. The attacker needs to be an authorized user on the local machine, and hosts without Hyper-V can skip it. The sources do not list affected versions or a fix.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":["hyperv","windowshyperv"],"ptokens":["hyper","windows"],"labels":["hyperv","infrastructure","medium","vendor","virtualization","windows"],"campaign_type":null,"search_a":"'-119385':17A,20A '-2026':16A,19A 'caus':11A 'condit':6A 'cve':15A,18A 'denial':12A 'hyper':3A,23A 'hyper-v':2A,22A 'let':7A 'local':9A 'race':5A 'servic':14A 'user':10A 'v':4A,24A 'window':1A 'windows':21A","search_b":"'attack':47B,61B 'author':46B 'code':64B 'condit':33B 'crash':48B 'data':67B 'execut':65B 'exposur':68B 'handl':40B 'hyper':26B,38B 'hyper-v':25B,37B 'infrastructur':28B 'lead':62B 'let':44B 'local':53B 'race':32B 'resourc':43B 'say':58B 'servic':52B 'share':42B 'sourc':55B 'stall':50B 'v':27B,39B 'virtual':29B 'whether':59B 'window':30B,36B","search_c":"'allow':84C 'attack':87C 'author':86C 'concurr':69C 'condit':78C 'deni':89C 'execut':70C 'hyper':82C 'hyper-v':81C 'improp':75C 'local':91C 'race':77C 'resourc':73C 'servic':90C 'share':72C 'synchron':76C 'use':71C 'v':83C 'window':80C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:19:52+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-119385","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-119385","severity":null,"published_at":"2026-11-10T19:19:52+00:00","modified_at":"2026-11-10T19:19:52+00:00","first_seen_at":"2026-11-10T19:24:56+00:00","fetched_at":"2026-11-10T19:24:56+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"}