CVE-2025-27464 CRITICAL

CVE-2025-27464: WinPVDrivers: Excessive permissions on user-exposed devices

Vendor Xen
Product Windows PV drivers
Weakness CWE-276
Published July 9, 2026
Last update July 9, 2026
View on NVD All CVEs

CVSS base score

9.4/10
Attack vector Local
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

What the vulnerability does

01Description

[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] The Windows PV drivers expose various facilities to userspace. Several of these have no security descriptor, and are therefore fully accessible to unprivileged users. These are: 1. XenCons, CVE-2025-27462 2. XenIface, CVE-2025-27463 3. XenBus, CVE-2025-27464

Key dates

02Disclosure timeline

July 9, 2026 CVE published