CVE-2025-27462: CWE-276 Incorrect default permissions in Xen Windows PV drivers
[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
AI Analysis
Technical Summary
The Xen Windows PV drivers expose several facilities to userspace, including XenCons, XenIface, and XenBus. For CVE-2025-27462 specifically, the XenCons interface lacks a security descriptor, resulting in incorrect default permissions that allow unprivileged users full access. This vulnerability is classified under CWE-276 (Incorrect Default Permissions) and has a CVSS 4.0 score of 9.4, indicating critical severity. No patch or remediation guidance is currently provided by the vendor, and no known exploits are reported in the wild.
Potential Impact
Due to the absence of security descriptors on the XenCons interface, unprivileged users can access this facility fully, potentially leading to unauthorized actions or information disclosure within the Xen Windows PV driver environment. The critical CVSS score reflects high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to affected systems and consider applying any vendor-recommended workarounds once published.
CVE-2025-27462: CWE-276 Incorrect default permissions in Xen Windows PV drivers
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 v4.0
Score 9.4critical
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Xen Windows PV drivers expose several facilities to userspace, including XenCons, XenIface, and XenBus. For CVE-2025-27462 specifically, the XenCons interface lacks a security descriptor, resulting in incorrect default permissions that allow unprivileged users full access. This vulnerability is classified under CWE-276 (Incorrect Default Permissions) and has a CVSS 4.0 score of 9.4, indicating critical severity. No patch or remediation guidance is currently provided by the vendor, and no known exploits are reported in the wild.
Potential Impact
Due to the absence of security descriptors on the XenCons interface, unprivileged users can access this facility fully, potentially leading to unauthorized actions or information disclosure within the Xen Windows PV driver environment. The critical CVSS score reflects high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to affected systems and consider applying any vendor-recommended workarounds once published.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- XEN
- Date Reserved
- 2025-02-26T09:16:54.461Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a4fbf4768715ace439fdced
Added to database: 07/09/2026, 15:33:27 UTC
Last enriched: 07/09/2026, 15:49:31 UTC
Last updated: 07/10/2026, 03:34:49 UTC
Views: 7
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