Critical severity · published Jul 9, 2026
CVE-2025-27463
WinPVDrivers: Excessive permissions on user-exposed devices
9.4
CVSS
0.2%
EPSS
No
On KEV
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
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 5% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WP
Windows PV drivers · Xen
All versions, or not specified · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-27463
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-27463
xenbits.xen.org
https://xenbits.xen.org/xsa/advisory-468.html
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CVE-2025-27462
WinPVDrivers: Excessive permissions on user-exposed devices