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Windows Container Isolation FS Filter Driver (unionfs.sys) Elevation of Privilege Vulnerability

Type: advisorySource: Official CVE List1 source record

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to elevate privileges locally.

Announced Source revision 1
Original source ↗

CVE-2026-97787

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-97787

Windows 11 version 23H2

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Windows 11 Version 23H2

Source reference: /containers/cna/affected/1/product

Affected versions
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Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Windows 11 Version 24H2

Source reference: /containers/cna/affected/2/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Windows 11 Version 25H2

Source reference: /containers/cna/affected/3/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Windows 11 version 26H1

Source reference: /containers/cna/affected/4/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Windows 11 Version 26H2

Source reference: /containers/cna/affected/5/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Windows Server 2022

Source reference: /containers/cna/affected/6/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Windows Server 2025

Source reference: /containers/cna/affected/7/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Windows Server 2025 (Server Core installation)

Source reference: /containers/cna/affected/8/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "vendor": "Microsoft",
    "product": "Windows 11 version 23H2",
    "versions": [
      {
        "status": "affected",
        "version": "10.0.22631.0",
        "lessThan": "10.0.22631.7652",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "ARM64-based Systems"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Windows 11 Version 23H2",
    "versions": [
      {
        "status": "affected",
        "version": "10.0.22631.0",
        "lessThan": "10.0.22631.7652",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "x64-based Systems"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Windows 11 Version 24H2",
    "versions": [
      {
        "status": "affected",
        "version": "10.0.26100.0",
        "lessThan": "10.0.26100.9711",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "ARM64-based Systems",
      "x64-based Systems"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Windows 11 Version 25H2",
    "versions": [
      {
        "status": "affected",
        "version": "10.0.26200.0",
        "lessThan": "10.0.26200.9711",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "ARM64-based Systems",
      "x64-based Systems"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Windows 11 version 26H1",
    "versions": [
      {
        "status": "affected",
        "version": "10.0.28000.0",
        "lessThan": "10.0.28000.3231",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "ARM64-based Systems",
      "x64-based Systems"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Windows 11 Version 26H2",
    "versions": [
      {
        "status": "affected",
        "version": "10.0.26300.0",
        "lessThan": "10.0.26300.9711",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "ARM64-based Systems",
      "x64-based Systems"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Windows Server 2022",
    "versions": [
      {
        "status": "affected",
        "version": "10.0.20348.0",
        "lessThan": "10.0.20348.5761",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "x64-based Systems"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Windows Server 2025",
    "versions": [
      {
        "status": "affected",
        "version": "10.0.26100.0",
        "lessThan": "10.0.26100.33650",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "x64-based Systems"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Windows Server 2025 (Server Core installation)",
    "versions": [
      {
        "status": "affected",
        "version": "10.0.26100.0",
        "lessThan": "10.0.26100.33650",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "x64-based Systems"
    ]
  }
]
Related CVEs
CVE-2026-97787

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#55332 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement