{"id":"CVE-2026-95991","kind":"vulnerability","aliases":["CVE-2026-95991"],"related":[],"title":"Windows Graphics Kernel: use-after-free lets a local user gain higher privileges","description":"Use after free in Windows Graphics Kernel allows an authorized attacker to elevate privileges locally.","summary":"A use-after-free bug in the Windows Graphics Kernel lets an attacker who already has a local account raise their privileges. The sources do not say whether it is exploited in the wild.","severity":"high","cvss":7.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","windows"],"not_affected_if":["no-local-untrusted-users"],"how_to_check":"- Open Microsoft's Security Update Guide entry for CVE-2026-95991, find your Windows version in the affected products table and note the fixed build/KB. Run winver (or Get-HotFix) and compare; if the KB is installed or your build is at/above the fixed one, you are patched.","fix":null,"status":"open","published_at":"2026-11-10T19:21:55+00:00","first_seen_at":"2026-11-10T19:25:26+00:00","triaged_at":"2026-11-10T19:38:04+00:00","updated_at":"2026-11-10T20:13:23+00:00","category":"infrastructure","confidence":0.4,"triage":{"at":"2026-11-10T19:38:04Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Windows Graphics Kernel: use-after-free lets a local user gain higher privileges","impact":"high","summary":"A use-after-free bug in the Windows Graphics Kernel lets an attacker who already has a local account raise their privileges. The sources do not say whether it is exploited in the wild.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows"],"confidence":0.6,"fix_status":"unknown","needs_auth":"yes","worst_case":"local user gains SYSTEM-level privileges on the machine","analyst_note":"Check the Microsoft Security Update Guide entry for CVE-2026-95991 for affected builds and the patch KB.","how_to_check":"- Run `winver` on the machine and compare the build against Microsoft's security update guide entry for CVE-2026-95991\n- unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["no-local-untrusted-users"],"who_is_affected":"Any Windows machine with the graphics kernel component is in scope, and the attacker needs a local logon first. Shared multi-user hosts, terminal servers and workstations with untrusted local users carry the most risk. unknown for specific affected builds.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000684,"input_tokens":4484,"output_tokens":472,"severity_before":"high"},"analyst_status":"done","analyst_note":"Check the Microsoft Security Update Guide entry for CVE-2026-95991 for affected builds and the patch KB.","search":"'-2026':16A,19A '-95991':17A,20A 'account':42B 'allow':65C 'alreadi':38B 'attack':36B,68C 'author':67C 'bug':28B 'cve':15A,18A 'elev':70C 'exploit':54B 'free':7A,27B,60C 'gain':12A 'graphic':2A,32B,63C 'higher':13A 'infrastructur':21B 'kernel':3A,33B,64C 'let':8A,34B 'local':10A,41B,72C 'privileg':14A,45B,71C 'rais':43B 'say':50B 'sourc':47B 'use':5A,25B,58C 'use-after-fre':4A,24B 'user':11A 'whether':51B 'wild':57B 'window':1A,22B,31B,62C","nicknames":[],"mitigations":[],"who_affected":"Any Windows machine with the graphics kernel component is in scope, and the attacker needs a local logon first. Shared multi-user hosts, terminal servers and workstations with untrusted local users carry the most risk. unknown for specific affected builds.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"unknown","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["high","infrastructure","windows"],"campaign_type":null,"search_a":"'-2026':16A,19A '-95991':17A,20A 'cve':15A,18A 'free':7A 'gain':12A 'graphic':2A 'higher':13A 'kernel':3A 'let':8A 'local':10A 'privileg':14A 'use':5A 'use-after-fre':4A 'user':11A 'window':1A","search_b":"'account':42B 'alreadi':38B 'attack':36B 'bug':28B 'exploit':54B 'free':27B 'graphic':32B 'infrastructur':21B 'kernel':33B 'let':34B 'local':41B 'privileg':45B 'rais':43B 'say':50B 'sourc':47B 'use':25B 'use-after-fre':24B 'whether':51B 'wild':57B 'window':22B,31B","search_c":"'allow':65C 'attack':68C 'author':67C 'elev':70C 'free':60C 'graphic':63C 'kernel':64C 'local':72C 'privileg':71C 'use':58C 'window':62C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:21:55+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-2026-95991","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-95991","severity":null,"published_at":"2026-11-10T19:21:55+00:00","modified_at":"2026-11-10T19:21:55+00:00","first_seen_at":"2026-11-10T19:25:26+00:00","fetched_at":"2026-11-10T19:25:26+00:00","note":null},{"source":"analyst","external_id":"CVE-2026-95991:2624","url":null,"severity":null,"published_at":"2026-11-10T20:13:23+00:00","modified_at":"2026-11-10T20:13:23+00:00","first_seen_at":"2026-11-10T20:13:23+00:00","fetched_at":"2026-11-10T20:13:23+00:00","note":"Could not read Microsoft's advisory: MSRC page is JS-only (web-cli empty), CVRF API 404/too large, browser-cli 402 credits. Only NVD data (CVSS 7.8 AV:L/PR:L, vendor-scored) is known; builds, KB and exploitation status unknown. Nothing verified. Needs the MSRC entry read for builds/KB."}],"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"}