{"id":"CVE-2026-83756","aliases":["EUVD-2026-99981","GHSA-x3wm-44fj-6jpj"],"status":"published","title":"Windows Win32 Kernel Subsystem Elevation of Privilege Vulnerability","description":"Use after free in Windows Win32 Kernel Subsystem allows an authorized attacker to elevate privileges locally.","severity":{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00325,"percentile":0.25877,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-416"],"published":"2026-10-13T19:00:53Z","modified":"2026-11-10T20:42:27Z","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-2026-83756","tags":["vendor-advisory","patch","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-83756"},{"url":"https://github.com/advisories/GHSA-x3wm-44fj-6jpj"}],"sources":{"cve":[{"id":"CVE-2026-83756","title":"Windows Win32 Kernel Subsystem Elevation of Privilege Vulnerability","description":"Use after free in Windows Win32 Kernel Subsystem allows an authorized attacker to elevate privileges locally.","status":"published","published":"2026-10-13T19:00:53.969Z","modified":"2026-11-10T20:42:27.394Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high","assessor":"cna"}],"cwes":["CWE-416"],"updated_at":"2026-11-10T22:18:28.707469Z"}],"euvd":[{"id":"EUVD-2026-99981","description":"Use after free in Windows Win32 Kernel Subsystem allows an authorized attacker to elevate privileges locally.","status":"published","published":"2026-10-13T19:00:53Z","modified":"2026-11-10T20:42:27Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high"}],"updated_at":"2026-11-10T22:23:57.623557Z"}],"ghsa":[{"id":"GHSA-x3wm-44fj-6jpj","title":"Use after free in Windows Win32 Kernel Subsystem allows an authorized attacker to elevate...","description":"Use after free in Windows Win32 Kernel Subsystem allows an authorized attacker to elevate privileges locally.","status":"published","published":"2026-10-13T21:34:49Z","modified":"2026-10-13T21:34:49Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T15:13:16.842321Z"}],"nvd":[{"id":"CVE-2026-83756","description":"Use after free in Windows Win32 Kernel Subsystem allows an authorized attacker to elevate privileges locally.","status":"published","published":"2026-10-13T19:20:21.927Z","modified":"2026-10-21T19:00:30.727Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:12:57.603498Z"}]}}