{"id":"CVE-2026-70027","aliases":["EUVD-2026-99138","GHSA-85f9-w8fr-r836"],"status":"published","title":"Windows Subsystem for Linux Elevation of Privilege Vulnerability","description":"Heap-based buffer overflow in Windows Subsystem for Linux 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":0.00379,"percentile":0.32276,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-122"],"published":"2026-10-13T18:59:36Z","modified":"2026-11-10T20:34:56Z","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-2026-70027","tags":["vendor-advisory","patch","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-70027"},{"url":"https://github.com/advisories/GHSA-85f9-w8fr-r836"}],"sources":{"cve":[{"id":"CVE-2026-70027","title":"Windows Subsystem for Linux Elevation of Privilege Vulnerability","description":"Heap-based buffer overflow in Windows Subsystem for Linux allows an authorized attacker to elevate privileges locally.","status":"published","published":"2026-10-13T18:59:36.56Z","modified":"2026-11-10T20:34:56.662Z","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-122"],"updated_at":"2026-11-10T22:18:27.902968Z"}],"euvd":[{"id":"EUVD-2026-99138","description":"Heap-based buffer overflow in Windows Subsystem for Linux allows an authorized attacker to elevate privileges locally.","status":"published","published":"2026-10-13T18:59:36Z","modified":"2026-11-10T20:34:56Z","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":"2026-11-10T21:23:23.709697Z"}],"ghsa":[{"id":"GHSA-85f9-w8fr-r836","title":"Heap-based buffer overflow in Windows Subsystem for Linux allows an authorized attacker to...","description":"Heap-based buffer overflow in Windows Subsystem for Linux allows an authorized attacker to elevate privileges locally.","status":"published","published":"2026-10-13T21:34:00Z","modified":"2026-10-13T21:34:07Z","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-122"],"updated_at":"2026-11-02T15:13:14.588915Z"}],"nvd":[{"id":"CVE-2026-70027","description":"Heap-based buffer overflow in Windows Subsystem for Linux allows an authorized attacker to elevate privileges locally.","status":"published","published":"2026-10-13T19:19:14.01Z","modified":"2026-10-16T19:12:54.97Z","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-122"],"updated_at":"2026-11-02T14:12:57.603498Z"}]}}