CVE catalog

CVE-2026-27922

Use after free in Windows Ancillary Function Driver…

[CVE catalog]

Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

Severity
High · CVSS 7CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
Source
[NVD] · [CVE record]
EPSS
0.20% · Oct 27, 2026

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Version impact has not been established. The original provider fields are retained below.

Provider details and historical evidence
Original provider fields
{
  "package_releases": [],
  "fixed_versions": [],
  "distribution_packages": [
    {
      "name": "windows_10_1607",
      "ecosystem": "cpe",
      "fixed_version": "10.0.14393.9060"
    },
    {
      "name": "windows_10_1809",
      "ecosystem": "cpe",
      "fixed_version": "10.0.17763.8644"
    },
    {
      "name": "windows_10_21h2",
      "ecosystem": "cpe",
      "fixed_version": "10.0.19044.7184"
    },
    {
      "name": "windows_10_22h2",
      "ecosystem": "cpe",
      "fixed_version": "10.0.19045.7184"
    },
    {
      "name": "windows_11_23h2",
      "ecosystem": "cpe",
      "fixed_version": "10.0.22631.6936"
    },
    {
      "name": "windows_11_24h2",
      "ecosystem": "cpe",
      "fixed_version": "10.0.26100.8246"
    },
    {
      "name": "windows_11_25h2",
      "ecosystem": "cpe",
      "fixed_version": "10.0.26200.8246"
    },
    {
      "name": "windows_11_26h1",
      "ecosystem": "cpe",
      "fixed_version": "10.0.28000.1836"
    },
    {
      "name": "windows_server_2012",
      "ecosystem": "cpe",
      "fixed_version": ""
    },
    {
      "name": "windows_10_1607",
      "ranges": [
        {
          "fixed": "10.0.14393.9060",
          "introduced": "",
          "last_affected": "",
          "start_excluding": ""
        }
      ],
      "ecosystem": "cpe",
      "fixed_version": "10.0.14393.9060",
      "provider_record_id": "NVD-CVE-2026-27922"
    },
    {
      "name": "windows_10_1809",
      "ranges": [
        {
          "fixed": "10.0.17763.8644",
          "introduced": "",
          "last_affected": "",
          "start_excluding": ""
        }
      ],
      "ecosystem": "cpe",
      "fixed_version": "10.0.17763.8644",
      "provider_record_id": "NVD-CVE-2026-27922"
    },
    {
      "name": "windows_10_21h2",
      "ranges": [
        {
          "fixed": "10.0.19044.7184",
          "introduced": "",
          "last_affected": "",
          "start_excluding": ""
        }
      ],
      "ecosystem": "cpe",
      "fixed_version": "10.0.19044.7184",
      "provider_record_id": "NVD-CVE-2026-27922"
    },
    {
      "name": "windows_10_22h2",
      "ranges": [
        {
          "fixed": "10.0.19045.7184",
          "introduced": "",
          "last_affected": "",
          "start_excluding": ""
        }
      ],
      "ecosystem": "cpe",
      "fixed_version": "10.0.19045.7184",
      "provider_record_id": "NVD-CVE-2026-27922"
    },
    {
      "name": "windows_11_23h2",
      "ranges": [
        {
          "fixed": "10.0.22631.6936",
          "introduced": "",
          "last_affected": "",
          "start_excluding": ""
        }
      ],
      "ecosystem": "cpe",
      "fixed_version": "10.0.22631.6936",
      "provider_record_id": "NVD-CVE-2026-27922"
    },
    {
      "name": "windows_11_24h2",
      "ranges": [
        {
          "fixed": "10.0.26100.8246",
          "introduced": "",
          "last_affected": "",
          "start_excluding": ""
        }
      ],
      "ecosystem": "cpe",
      "fixed_version": "10.0.26100.8246",
      "provider_record_id": "NVD-CVE-2026-27922"
    },
    {
      "name": "windows_11_25h2",
      "ranges": [
        {
          "fixed": "10.0.26200.8246",
          "introduced": "",
          "last_affected": "",
          "start_excluding": ""
        }
      ],
      "ecosystem": "cpe",
      "fixed_version": "10.0.26200.8246",
      "provider_record_id": "NVD-CVE-2026-27922"
    },
    {
      "name": "windows_11_26h1",
      "ranges": [
        {
          "fixed": "10.0.28000.1836",
          "introduced": "",
          "last_affected": "",
          "start_excluding": ""
        }
      ],
      "ecosystem": "cpe",
      "fixed_version": "10.0.28000.1836",
      "provider_record_id": "NVD-CVE-2026-27922"
    },
    {
      "name": "windows_server_2012",
      "ranges": [],
      "ecosystem": "cpe",
      "fixed_version": "",
      "provider_record_id": "NVD-CVE-2026-27922"
    }
  ]
}

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

Observed:

References

[CERT-Bund public advisories] · [FIRST EPSS] · [National Vulnerability Database (NVD)]