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CVE-2025-27463— WinPVDrivers: Excessive permissions on user-exposed devices

Quick assessment

Affected
Xen Windows PV drivers
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Xen是Xen开源的一款开源的虚拟机监视器产品。该产品能够使不同和不兼容的操作系统运行在同一台计算机上，并支持在运行时进行迁移，保证正常运行并且避免宕机。 Xen存在安全漏洞，该漏洞源于通过WinPVDrivers绕过限制，可能导致权限提升。

AI Predicted 9.8 Difficulty: Easy EPSS 0.16% · P4

Affected Version Matrix 1

VendorProduct Version RangeStatus
Xen Windows PV drivers all affected
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I. Basic Information for CVE-2025-27463

Vulnerability Information
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Vulnerability Title
WinPVDrivers: Excessive permissions on user-exposed devices
Source: CVE Program / CVE List V5
Vulnerability Description
[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
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
缺省权限不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Xen 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Xen是Xen开源的一款开源的虚拟机监视器产品。该产品能够使不同和不兼容的操作系统运行在同一台计算机上，并支持在运行时进行迁移，保证正常运行并且避免宕机。 Xen存在安全漏洞，该漏洞源于通过WinPVDrivers绕过限制，可能导致权限提升。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Xen Windows PV drivers all -

II. Public POCs for CVE-2025-27463

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III. Intelligence Information for CVE-2025-27463

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Vendor Advisories for CVE-2025-27463 (1)

Same Patch Batch · Xen · 2026-07-09 · 11 CVEs total

CVE-2026-42486 Multiple RBAC issues in XAPI
CVE-2026-23562 Multiple RBAC issues in XAPI
CVE-2026-23560 Multiple RBAC issues in XAPI
CVE-2026-23561 Multiple RBAC issues in XAPI
CVE-2026-23559 Multiple RBAC issues in XAPI
CVE-2026-23556 oxenstored keeps quota related use counts across domain destruction
CVE-2025-58146 XAPI UTF-8 string handling
CVE-2025-58151 varstored: TOCTOU issues with mapped guest memory
CVE-2025-27464 WinPVDrivers: Excessive permissions on user-exposed devices
CVE-2025-27462 WinPVDrivers: Excessive permissions on user-exposed devices

IV. Related Vulnerabilities

Same product: Windows PV drivers
Same vendor: Xen
Same weakness: CWE-276

V. Comments for CVE-2025-27463

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