{"id":"CVE-2026-83636","aliases":["EUVD-2026-99928","GHSA-9g32-6jp5-7gv6"],"status":"published","title":"Windows Hyper-V Denial of Service Vulnerability","description":"Null pointer dereference in Windows Hyper-V allows an authorized attacker to deny service locally.","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00434,"percentile":0.38146,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-476"],"published":"2026-10-13T19:00:49Z","modified":"2026-11-10T20:41:59Z","products":[{"vendor":"microsoft","product":"windows 10 version 21h2"},{"vendor":"microsoft","product":"windows 10 version 22h2"},{"vendor":"microsoft","product":"windows 11 version 23h2"},{"vendor":"microsoft","product":"windows 11 version 24h2"},{"vendor":"microsoft","product":"windows 11 version 25h2"},{"vendor":"microsoft","product":"windows 11 version 26h1"},{"vendor":"microsoft","product":"windows 11 version 26h2"},{"vendor":"microsoft","product":"windows server 2022"},{"vendor":"microsoft","product":"windows server 2025"},{"vendor":"microsoft","product":"windows server 2025 (server core installation)"},{"vendor":"microsoft","product":"windows_10_21h2"},{"vendor":"microsoft","product":"windows_10_22h2"},{"vendor":"microsoft","product":"windows_11_23h2"},{"vendor":"microsoft","product":"windows_11_24h2"},{"vendor":"microsoft","product":"windows_11_25h2"},{"vendor":"microsoft","product":"windows_11_26h1"},{"vendor":"microsoft","product":"windows_11_26h2"},{"vendor":"microsoft","product":"windows_server_2022"},{"vendor":"microsoft","product":"windows_server_2025"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83636","tags":["vendor-advisory","patch","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-83636"},{"url":"https://github.com/advisories/GHSA-9g32-6jp5-7gv6"}],"sources":{"cve":[{"id":"CVE-2026-83636","title":"Windows Hyper-V Denial of Service Vulnerability","description":"Null pointer dereference in Windows Hyper-V allows an authorized attacker to deny service locally.","status":"published","published":"2026-10-13T19:00:49.092Z","modified":"2026-11-10T20:41:59.813Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C","level":"medium","assessor":"cna"}],"cwes":["CWE-476"],"updated_at":"2026-11-10T22:18:28.707469Z"}],"euvd":[{"id":"EUVD-2026-99928","description":"Null pointer dereference in Windows Hyper-V allows an authorized attacker to deny service locally.","status":"published","published":"2026-10-13T19:00:49Z","modified":"2026-11-10T20:41:59Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C","level":"medium"}],"updated_at":"2026-11-10T22:23:57.623557Z"}],"ghsa":[{"id":"GHSA-9g32-6jp5-7gv6","title":"Null pointer dereference in Windows Hyper-V allows an authorized attacker to deny service locally.","description":"Null pointer dereference in Windows Hyper-V allows an authorized attacker to deny service locally.","status":"published","published":"2026-10-13T21:34:29Z","modified":"2026-10-13T21:34:38Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T15:13:16.244853Z"}],"nvd":[{"id":"CVE-2026-83636","description":"Null pointer dereference in Windows Hyper-V allows an authorized attacker to deny service locally.","status":"published","published":"2026-10-13T19:20:03.737Z","modified":"2026-10-28T19:43:50.88Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:12:57.603498Z"}]}}