{"id":"CVE-2026-113751","kind":"vulnerability","aliases":["CVE-2026-113751"],"related":[],"title":"Windows Fast FAT driver race condition lets local attacker gain privileges","description":"Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Fast FAT Driver allows an authorized attacker to elevate privileges locally.","summary":"A race condition in the Windows Fast FAT file system driver lets an authorized local user gain higher privileges. The attacker needs a local foothold on the machine first.","severity":"high","cvss":7.0,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["fat-filesystem","infrastructure","windows"],"not_affected_if":["no-local-untrusted-users"],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:18:53+00:00","first_seen_at":"2026-11-10T19:24:37+00:00","triaged_at":"2026-11-10T19:52:18+00:00","updated_at":"2026-11-10T19:52:18+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-11-10T19:52:18Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Windows Fast FAT driver race condition lets local attacker gain privileges","impact":"high","summary":"A race condition in the Windows Fast FAT file system driver lets an authorized local user gain higher privileges. The attacker needs a local foothold on the machine first.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows","fat-filesystem"],"confidence":0.5,"fix_status":"unknown","needs_auth":"yes","worst_case":"local user gains elevated system privileges on the Windows machine","analyst_note":"Find the Microsoft security update guide entry for CVE-2026-113751 to confirm affected Windows builds and the patch.","how_to_check":"unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["no-local-untrusted-users"],"who_is_affected":"Windows machines that use the Fast FAT file system driver. The flaw needs a local, already-authorized user, so exposure is limited to shared or multi-user systems where untrusted users have logon access. The sources do not say which Windows builds are affected.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000665,"input_tokens":4508,"output_tokens":428,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Find the Microsoft security update guide entry for CVE-2026-113751 to confirm affected Windows builds and the patch.","search":"'-113751':14A,17A '-2026':13A,16A 'allow':67C 'attack':9A,43B,70C 'author':36B,69C 'concurr':52C 'condit':6A,25B,61C 'cve':12A,15A 'driver':4A,33B,66C 'elev':72C 'execut':53C 'fast':2A,29B,64C 'fat':3A,19B,30B,65C 'fat-filesystem':18B 'file':31B 'filesystem':20B 'first':51B 'foothold':47B 'gain':10A,39B 'higher':40B 'improp':58C 'infrastructur':21B 'let':7A,34B 'local':8A,37B,46B,74C 'machin':50B 'need':44B 'privileg':11A,41B,73C 'race':5A,24B,60C 'resourc':56C 'share':55C 'synchron':59C 'system':32B 'use':54C 'user':38B 'window':1A,22B,28B,63C","nicknames":[],"mitigations":[],"who_affected":"Windows machines that use the Fast FAT file system driver. The flaw needs a local, already-authorized user, so exposure is limited to shared or multi-user systems where untrusted users have logon access. The sources do not say which Windows builds are affected.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["fatfilesystem","high","infrastructure","windows"],"campaign_type":null,"search_a":"'-113751':14A,17A '-2026':13A,16A 'attack':9A 'condit':6A 'cve':12A,15A 'driver':4A 'fast':2A 'fat':3A 'gain':10A 'let':7A 'local':8A 'privileg':11A 'race':5A 'window':1A","search_b":"'attack':43B 'author':36B 'condit':25B 'driver':33B 'fast':29B 'fat':19B,30B 'fat-filesystem':18B 'file':31B 'filesystem':20B 'first':51B 'foothold':47B 'gain':39B 'higher':40B 'infrastructur':21B 'let':34B 'local':37B,46B 'machin':50B 'need':44B 'privileg':41B 'race':24B 'system':32B 'user':38B 'window':22B,28B","search_c":"'allow':67C 'attack':70C 'author':69C 'concurr':52C 'condit':61C 'driver':66C 'elev':72C 'execut':53C 'fast':64C 'fat':65C 'improp':58C 'local':74C 'privileg':73C 'race':60C 'resourc':56C 'share':55C 'synchron':59C 'use':54C 'window':63C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:18:53+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-113751","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-113751","severity":null,"published_at":"2026-11-10T19:18:53+00:00","modified_at":"2026-11-10T19:18:53+00:00","first_seen_at":"2026-11-10T19:24:37+00:00","fetched_at":"2026-11-10T19:24:37+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"}