PT-2026-47871 · Microsoft · Universal Disk Format File System Driver+1

CVE-2026-40409 · Published 2026-06-09 · Updated 2026-06-11

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Windows Universal Disk Format File System Driver (UDFS) (affected versions not specified)

Description An elevation-of-privilege issue exists in the Windows Universal Disk Format File System Driver (UDFS), which allows attackers to gain higher permissions and affect the system.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

DoS

LPE

Weakness Enumeration

CWE-197

Related Identifiers

BDU:2026-08586

CVE-2026-40409

Affected Products

Universal Disk Format File System Driver

Windows

References · 6

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40409 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-40409 · Security Note
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-40409 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-08586 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-40409 · Security Note
• https://t.me/cveNotify/167083 · Telegram Post