certfr_avis - certfr-2026-avi-1174

CERTFR-2026-AVI-1174

Vulnerability from certfr_avis

Une vulnérabilité a été découverte dans Microsoft Windows. Elle permet à un attaquant de provoquer une élévation de privilèges.

Solutions

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

Impacted products

	Vendor	Product	Description
	Microsoft	Windows	Windows 11 version 26H1 pour systèmes x64 antérieures à 10.0.28000.2956
	Microsoft	Windows	Windows 11 Version 26H1 pour systèmes ARM64 versions antérieures à 10.0.28000.2956

References

Title

Publication Time

Tags

Bulletin de sécurité Microsoft Windows CVE-2026-85921

2026-09-14

vendor-advisory

Show details on source website

JSON

To clipboard

{
  "$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
  "affected_systems": [
    {
      "description": "Windows 11 version 26H1 pour syst\u00e8mes x64 ant\u00e9rieures \u00e0 10.0.28000.2956",
      "product": {
        "name": "Windows",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    },
    {
      "description": "Windows 11 Version 26H1 pour syst\u00e8mes ARM64 versions ant\u00e9rieures \u00e0 10.0.28000.2956",
      "product": {
        "name": "Windows",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    }
  ],
  "affected_systems_content": "",
  "content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
  "cves": [
    {
      "name": "CVE-2026-85921",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-85921"
    }
  ],
  "initial_release_date": "2026-09-15T00:00:00",
  "last_revision_date": "2026-09-15T00:00:00",
  "links": [],
  "reference": "CERTFR-2026-AVI-1174",
  "revisions": [
    {
      "description": "Version initiale",
      "revision_date": "2026-09-15T00:00:00.000000"
    }
  ],
  "risks": [
    {
      "description": "\u00c9l\u00e9vation de privil\u00e8ges"
    }
  ],
  "summary": "Une vuln\u00e9rabilit\u00e9 a \u00e9t\u00e9 d\u00e9couverte dans Microsoft Windows. Elle permet \u00e0 un attaquant de provoquer une \u00e9l\u00e9vation de privil\u00e8ges.",
  "title": "Vuln\u00e9rabilit\u00e9 dans Microsoft Windows",
  "vendor_advisories": [
    {
      "published_at": "2026-09-14",
      "title": "Bulletin de s\u00e9curit\u00e9 Microsoft Windows CVE-2026-85921",
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85921"
    }
  ]
}

CVE-2026-85921 (GCVE-0-2026-85921)

Vulnerability from cvelistv5

Published

2026-09-14 17:19

Modified

2026-09-15 22:39

Severity ?

8.2 (High) - CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C

CWE

CWE-415 - Double Free

Summary

Double free in Windows Secure Kernel Mode allows an authorized attacker to elevate privileges locally.

References

URL

Tags

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85921

vendor-advisory, patch

Impacted products

	Vendor	Product	Version
	Microsoft	Windows 11 version 26H1	Version: 10.0.28000.0 < 10.0.28000.2956

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-85921",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-14T00:00:00+00:00",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-15T03:56:12.878Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "platforms": [
            "ARM64-based Systems",
            "x64-based Systems"
          ],
          "product": "Windows 11 version 26H1",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.28000.2956",
              "status": "affected",
              "version": "10.0.28000.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:microsoft:windows_11_26H1:*:*:*:*:*:*:x64:*",
                  "versionEndExcluding": "10.0.28000.2956",
                  "versionStartIncluding": "10.0.28000.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "datePublic": "2026-09-14T14:00:00.000Z",
      "descriptions": [
        {
          "lang": "en-US",
          "value": "Double free in Windows Secure Kernel Mode allows an authorized attacker to elevate privileges locally."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en-US",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-415",
              "description": "CWE-415: Double Free",
              "lang": "en-US",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-15T22:39:14.254Z",
        "orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
        "shortName": "microsoft"
      },
      "references": [
        {
          "name": "Windows Secure Kernel Mode Elevation of Privilege Vulnerability",
          "tags": [
            "vendor-advisory",
            "patch"
          ],
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85921"
        }
      ],
      "title": "Windows Secure Kernel Mode Elevation of Privilege Vulnerability"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
    "assignerShortName": "microsoft",
    "cveId": "CVE-2026-85921",
    "datePublished": "2026-09-14T17:19:07.991Z",
    "dateReserved": "2026-09-04T18:24:41.250Z",
    "dateUpdated": "2026-09-15T22:39:14.254Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

Action not permitted

CERTFR-2026-AVI-1174

Vulnerability from certfr_avis

Solutions

CVE-2026-85921 (GCVE-0-2026-85921)

Vulnerability from cvelistv5

Tags

Sightings

Nomenclature