{"id":"CVE-2026-95893","kind":"vulnerability","aliases":["CVE-2026-95893"],"related":[],"title":"Windows Win32K: uninitialized memory lets a local user read data","description":"Use of uninitialized resource in Windows Win32K allows an authorized attacker to disclose information locally.","summary":"Windows Win32K, the kernel graphics driver, reads a resource it never initialized, which can leak memory contents. An attacker who already has a logon on the machine can read information they should not see.","severity":"medium","cvss":5.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","win32k","windows"],"not_affected_if":["no-untrusted-local-users"],"how_to_check":"- Check the Windows build with `winver` and compare it against the Microsoft security update guide entry for CVE-2026-95893\n- Confirm Windows Update has installed the latest cumulative update","fix":null,"status":"open","published_at":"2026-11-10T19:21:42+00:00","first_seen_at":"2026-11-10T19:25:23+00:00","triaged_at":"2026-11-10T20:00:30+00:00","updated_at":"2026-11-10T20:00:30+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-11-10T20:00:30Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Windows Win32K: uninitialized memory lets a local user read data","impact":"low","summary":"Windows Win32K, the kernel graphics driver, reads a resource it never initialized, which can leak memory contents. An attacker who already has a logon on the machine can read information they should not see.","audience":"everyone","category":"infrastructure","nicknames":[],"who_cares":["windows","win32k"],"confidence":0.6,"fix_status":"unknown","needs_auth":"yes","worst_case":"local user reads kernel memory contents, possibly sensitive data","analyst_note":"Confirm affected Windows builds and the fixed cumulative update from the Microsoft Security Response Center entry for CVE-2026-95893.","how_to_check":"- Check the Windows build with `winver` and compare it against the Microsoft security update guide entry for CVE-2026-95893\n- Confirm Windows Update has installed the latest cumulative update","plain_action":"Install the latest Windows security update through Windows Update.","product_name":"","needs_analyst":true,"not_affected_if":["no-untrusted-local-users"],"who_is_affected":"Affects Windows systems with the Win32K component, where a local user with an account can trigger the flaw. Shared multi-user machines and servers with untrusted local logons carry the most exposure. The sources do not list affected Windows builds.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000704,"input_tokens":4485,"output_tokens":510,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':12A,15A '-95893':13A,16A 'allow':61C 'alreadi':40B 'attack':38B,64C 'author':63C 'content':36B 'cve':11A,14A 'data':10A 'disclos':66C 'driver':25B 'graphic':24B 'inform':49B,67C 'infrastructur':17B 'initi':31B 'kernel':23B 'leak':34B 'let':5A 'local':7A,68C 'logon':43B 'machin':46B 'memori':4A,35B 'never':30B 'read':9A,26B,48B 'resourc':28B,57C 'see':53B 'uniniti':3A,56C 'use':54C 'user':8A 'win32k':2A,18B,21B,60C 'window':1A,19B,20B,59C","nicknames":[],"mitigations":[],"who_affected":"Affects Windows systems with the Win32K component, where a local user with an account can trigger the flaw. Shared multi-user machines and servers with untrusted local logons carry the most exposure. The sources do not list affected Windows builds.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"everyone","plain_action":null,"pkeys":[],"ptokens":[],"labels":["infrastructure","medium","win32k","windows"],"campaign_type":null,"search_a":"'-2026':12A,15A '-95893':13A,16A 'cve':11A,14A 'data':10A 'let':5A 'local':7A 'memori':4A 'read':9A 'uniniti':3A 'user':8A 'win32k':2A 'window':1A","search_b":"'alreadi':40B 'attack':38B 'content':36B 'driver':25B 'graphic':24B 'inform':49B 'infrastructur':17B 'initi':31B 'kernel':23B 'leak':34B 'logon':43B 'machin':46B 'memori':35B 'never':30B 'read':26B,48B 'resourc':28B 'see':53B 'win32k':18B,21B 'window':19B,20B","search_c":"'allow':61C 'attack':64C 'author':63C 'disclos':66C 'inform':67C 'local':68C 'resourc':57C 'uniniti':56C 'use':54C 'win32k':60C 'window':59C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:21:42+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-95893","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-95893","severity":null,"published_at":"2026-11-10T19:21:42+00:00","modified_at":"2026-11-10T19:21:42+00:00","first_seen_at":"2026-11-10T19:25:23+00:00","fetched_at":"2026-11-10T19:25:23+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"}