Vulnerability details
CVE-2025-27464
Xen Windows PV drivers
WinPVDrivers: Excessive permissions on user-exposed devices
CVSS 4.0
9.4Critical
Official 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
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.4Critical | 4.0 | CVEProject cvelistV5 (CNA) (XEN) | 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 |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Xen | Windows PV drivers | all | CVEProject cvelistV5 (CNA) |
References and advisories
1
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Details
- Published
- 2026-07-09
- Last updated
- 2026-07-09
- State
- Published
- Assigner (CNA)
- XEN
Exploit prediction (EPSS)
0.15%
Probability of exploitation in 30 days
5%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-276Incorrect default permissions