CVE-2025-27463

CRITICAL

WinPVDrivers: Excessive permissions on user-exposed devices

Title source: cna

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

References (1)

Core 1

Core References

https://xenbits.xen.org/xsa/advisory-468.html

Scores

CVSS v4 9.4

EPSS 0.0016

EPSS Percentile 5.4%

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact total

Details

CWE

CWE-276

Status published

Products (1)

Xen/Windows PV drivers all

Published Jul 09, 2026

Tracked Since Jul 09, 2026