{"id":"CVE-2026-96056","kind":"vulnerability","aliases":["CVE-2026-96056"],"related":[],"title":"Windows USB driver heap overflow lets a local user gain higher privileges","description":"Heap-based buffer overflow in Windows USB Driver allows an authorized attacker to elevate privileges locally.","summary":"A heap-based buffer overflow in the Windows USB driver lets a user who already has some access on the machine corrupt kernel memory. An attacker can use it to elevate privileges on that Windows system.","severity":"high","cvss":7.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","usb","windows"],"not_affected_if":["no-local-untrusted-users"],"how_to_check":"Run winver (or [System.Environment]::OSVersion) to get the build, then compare it with the November 2026 cumulative update for your Windows version in the MSRC Security Update Guide entry for CVE-2026-96056. The exact build numbers are not yet confirmed. Confirm the November 2026 cumulative update is installed (Get-HotFix).","fix":"Install the November 2026 (2026-11-10) Windows cumulative security update for your Windows version. Exact KB and build numbers: unknown, to be read from the MSRC entry.","status":"open","published_at":"2026-11-10T19:22:03+00:00","first_seen_at":"2026-11-10T19:25:28+00:00","triaged_at":"2026-11-10T19:36:47+00:00","updated_at":"2026-11-10T19:58:21+00:00","category":"infrastructure","confidence":0.4,"triage":{"at":"2026-11-10T19:36:47Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Windows USB driver heap overflow lets a local user gain higher privileges","impact":"high","summary":"A heap-based buffer overflow in the Windows USB driver lets a user who already has some access on the machine corrupt kernel memory. An attacker can use it to elevate privileges on that Windows system.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows","usb"],"confidence":0.5,"fix_status":"unknown","needs_auth":"yes","worst_case":"local user gains SYSTEM privileges on the Windows machine","analyst_note":"Check the Microsoft Security Update Guide entry for CVE-2026-96056 for affected builds and the patch KB; the NVD text alone gives no versions or fix.","how_to_check":"- Check the Windows build with `winver` and compare it against the Microsoft security update guide entry for CVE-2026-96056\n- Confirm Windows Update has applied the latest cumulative update\n- unknown for anything beyond that, as the sources do not say which builds are affected","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["no-local-untrusted-users"],"who_is_affected":"Any Windows machine where a user with local access could plug in or interact with USB devices is in scope; the sources do not list affected builds. Servers without interactive local users are less exposed, but the sources do not say which configurations are safe.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000714,"input_tokens":4492,"output_tokens":530,"severity_before":"high"},"analyst_status":"done","analyst_note":"Check the Microsoft Security Update Guide entry for CVE-2026-96056 for affected builds and the patch KB; the NVD text alone gives no versions or fix.","search":"'-2026':14A,17A '-96056':15A,18A 'access':40B 'allow':68C 'alreadi':37B 'attack':48B,71C 'author':70C 'base':25B,61C 'buffer':26B,62C 'corrupt':44B 'cve':13A,16A 'driver':3A,32B,67C 'elev':53B,73C 'gain':10A 'heap':4A,24B,60C 'heap-bas':23B,59C 'higher':11A 'infrastructur':19B 'kernel':45B 'let':6A,33B 'local':8A,75C 'machin':43B 'memori':46B 'overflow':5A,27B,63C 'privileg':12A,54B,74C 'system':58B 'usb':2A,20B,31B,66C 'use':50B 'user':9A,35B 'window':1A,21B,30B,57B,65C","nicknames":[],"mitigations":[],"who_affected":"Any Windows machine where a user with local access could plug in or interact with USB devices is in scope; the sources do not list affected builds. Servers without interactive local users are less exposed, but the sources do not say which configurations are safe.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"unknown","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["high","infrastructure","usb","windows"],"campaign_type":null,"search_a":"'-2026':14A,17A '-96056':15A,18A 'cve':13A,16A 'driver':3A 'gain':10A 'heap':4A 'higher':11A 'let':6A 'local':8A 'overflow':5A 'privileg':12A 'usb':2A 'user':9A 'window':1A","search_b":"'access':40B 'alreadi':37B 'attack':48B 'base':25B 'buffer':26B 'corrupt':44B 'driver':32B 'elev':53B 'heap':24B 'heap-bas':23B 'infrastructur':19B 'kernel':45B 'let':33B 'machin':43B 'memori':46B 'overflow':27B 'privileg':54B 'system':58B 'usb':20B,31B 'use':50B 'user':35B 'window':21B,30B,57B","search_c":"'allow':68C 'attack':71C 'author':70C 'base':61C 'buffer':62C 'driver':67C 'elev':73C 'heap':60C 'heap-bas':59C 'local':75C 'overflow':63C 'privileg':74C 'usb':66C 'window':65C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:22:03+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:L/AC:L/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-2026-96056","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-96056","severity":null,"published_at":"2026-11-10T19:22:03+00:00","modified_at":"2026-11-10T19:22:03+00:00","first_seen_at":"2026-11-10T19:25:28+00:00","fetched_at":"2026-11-10T19:25:28+00:00","note":null},{"source":"analyst","external_id":"CVE-2026-96056:2587","url":"https://api.msrc.microsoft.com/cvrf/v3.0/updates/CVE-2026-96056","severity":null,"published_at":"2026-11-10T19:58:21+00:00","modified_at":"2026-11-10T19:58:21+00:00","first_seen_at":"2026-11-10T19:58:21+00:00","fetched_at":"2026-11-10T19:58:21+00:00","note":"MSRC API confirms CVE-2026-96056 is in the November 2026 (2026-11-10) Patch Tuesday release. The affected builds and KB were not readable: the update guide page is JS-only and the CVRF document returned no match. Nothing verified. Sibling USB driver CVEs (e.g. CVE-2026-61926) share the pattern, but their builds do not transfer. Settle it by opening the MSRC update guide entry in a browser.","cites":["https://api.msrc.microsoft.com/cvrf/v3.0/updates/CVE-2026-96056"]}],"documents":[{"id":117723,"url":"https://api.msrc.microsoft.com/cvrf/v3.0/updates/CVE-2026-96056","title":"MSRC CVRF update index for CVE-2026-96056 (November 2026 Security Updates)","kind":"vendor","source":"analyst","publisher":null,"text":"MSRC API lists CVE-2026-96056 under the November 2026 Security Updates, initial release 2026-11-10. No affected builds or KB in this response.","published_at":null,"relation":"advisory","confidence":null,"note":null}],"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"}