Description
Windows Universal Disk Format File System Driver (UDFS) Elevation of Privilege Vulnerability
Published: 2026-07-14
Score: 7.3 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

The vulnerability is located in the Windows Universal Disk Format (UDFS) file system driver that handles UDF-formatted media. An attacker who can trigger the bug can gain higher privileges on the affected system; this elevation of privilege is inferred from the vulnerability type and the listed CWEs. This flaw is categorized as a buffer overflow (CWE-122) combined with an integer overflow (CWE-191) that can bypass permission checks; the integer overflow detail is inferred from the CWE list, as it is not explicitly stated in the CVE description.

Affected Systems

Affected systems include Microsoft Windows operating systems: Windows 10 releases 1607, 1809, 21H2, and 22H2; Windows 11 releases 24H2, 25H2, and 26H1; and Windows Server editions 2012, 2016, 2019, 2022, and 2025, including Server Core installations.

Risk and Exploitability

The CVSS score of 7.3 reflects a high severity, but the EPSS score of less than 1% indicates a very low current exploitation probability. The flaw is not listed in the CISA KEV catalog. Attackers would need local or direct access to UDF-formatted media or a removable device; this attack vector is inferred from the vulnerability type and the lack of documented network exposure. The elevated privileges could allow local attackers to modify or read protected data or install malware with higher permissions.

Generated by OpenCVE AI on July 31, 2026 at 08:56 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Download and install the Microsoft security update that contains the UDFS driver fix from the Microsoft Update Catalog or via Windows Update.
  • If the update cannot be applied immediately, disable the UDFS driver or remove support for UDF file systems by disabling the drive type or using Group Policy to block UDF formatted media.
  • Restrict removable media or block USB and optical devices that can carry UDF file systems through device restrictions or group policy until the patch is installed, and monitor event logs for unexpected UDFS activity.

Generated by OpenCVE AI on July 31, 2026 at 08:56 UTC.

Tracking

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Advisories

No advisories yet.

History

Wed, 15 Jul 2026 12:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 14 Jul 2026 17:15:00 +0000

Type Values Removed Values Added
Description Windows Universal Disk Format File System Driver (UDFS) Elevation of Privilege Vulnerability
Title Windows Universal Disk Format File System Driver (UDFS) Elevation of Privilege Vulnerability
First Time appeared Microsoft
Microsoft windows 10 1607
Microsoft windows 10 1809
Microsoft windows 10 21h2
Microsoft windows 10 22h2
Microsoft windows 11 24h2
Microsoft windows 11 25h2
Microsoft windows 11 26h1
Microsoft windows Server 2012
Microsoft windows Server 2012 R2
Microsoft windows Server 2016
Microsoft windows Server 2019
Microsoft windows Server 2022
Microsoft windows Server 2025
Weaknesses CWE-122
CWE-191
CPEs cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_21H2:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_22H2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_24H2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_25H2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_26H1:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2012:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2012_R2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft windows 10 1607
Microsoft windows 10 1809
Microsoft windows 10 21h2
Microsoft windows 10 22h2
Microsoft windows 11 24h2
Microsoft windows 11 25h2
Microsoft windows 11 26h1
Microsoft windows Server 2012
Microsoft windows Server 2012 R2
Microsoft windows Server 2016
Microsoft windows Server 2019
Microsoft windows Server 2022
Microsoft windows Server 2025
References
Metrics cvssV3_1

{'score': 7.3, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C'}


Subscriptions

Microsoft Windows 10 1607 Windows 10 1809 Windows 10 21h2 Windows 10 22h2 Windows 11 24h2 Windows 11 25h2 Windows 11 26h1 Windows Server 2012 Windows Server 2012 R2 Windows Server 2016 Windows Server 2019 Windows Server 2022 Windows Server 2025
cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-08-03T22:54:16.447Z

Reserved: 2026-06-01T17:02:37.207Z

Link: CVE-2026-49790

cve-icon Vulnrichment

Updated: 2026-07-15T10:47:35.946Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-31T09:00:07Z

Weaknesses
  • CWE-122

    Heap-based Buffer Overflow

  • CWE-191

    Integer Underflow (Wrap or Wraparound)