CVE-2025-27464: 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 XenBus (CVE-2025-27464), the driver fails to set a security descriptor, resulting in incorrect default permissions that grant full access to unprivileged users. This vulnerability is classified under CWE-276 (Incorrect Default Permissions). The CVSS 4.0 vector indicates local attack vector with low complexity, no privileges required, no user interaction, and high impacts on confidentiality, integrity, availability, scope, and security requirements. The vendor has not published a remediation or patch at this time.
Potential Impact
Unprivileged users on a system with the affected Xen Windows PV drivers can gain unauthorized full access to the XenBus facility due to missing security descriptors. This can lead to significant confidentiality, integrity, and availability impacts on the affected system components. The vulnerability is rated critical with a CVSS 4.0 score of 9.4, reflecting the severity of the permission misconfiguration.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict local user access to systems running the affected Xen Windows PV drivers where possible. Monitor vendor communications for updates on patches or official mitigations.
CVE-2025-27464: 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 XenBus (CVE-2025-27464), the driver fails to set a security descriptor, resulting in incorrect default permissions that grant full access to unprivileged users. This vulnerability is classified under CWE-276 (Incorrect Default Permissions). The CVSS 4.0 vector indicates local attack vector with low complexity, no privileges required, no user interaction, and high impacts on confidentiality, integrity, availability, scope, and security requirements. The vendor has not published a remediation or patch at this time.
Potential Impact
Unprivileged users on a system with the affected Xen Windows PV drivers can gain unauthorized full access to the XenBus facility due to missing security descriptors. This can lead to significant confidentiality, integrity, and availability impacts on the affected system components. The vulnerability is rated critical with a CVSS 4.0 score of 9.4, reflecting the severity of the permission misconfiguration.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict local user access to systems running the affected Xen Windows PV drivers where possible. Monitor vendor communications for updates on patches or official mitigations.
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: 6a4fbf4768715ace439fdcf3
Added to database: 07/09/2026, 15:33:27 UTC
Last enriched: 07/09/2026, 15:49:19 UTC
Last updated: 07/09/2026, 16:34:19 UTC
Views: 3
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