Executive brief
The Xen Project Windows Paravirtual (PV) drivers, which improve the performance of Windows virtual machines running on the Xen hypervisor, contain a security flaw in the XenIface component. This component lacks proper access controls, allowing any standard user on the virtual machine to gain full administrative or kernel-level control. An attacker could use this to bypass security boundaries, access sensitive data, or disrupt the entire guest operating system.
Technical details
The XenIface component within the Xen Project Windows PV drivers fails to implement security descriptors for certain facilities exposed to userspace. This results in incorrect default permissions (CWE-276), making these interfaces fully accessible to unprivileged users. An attacker with local access to a Windows guest VM can exploit this lack of access control to perform unauthorized operations, leading to a local privilege escalation (LPE) from a standard user to the guest kernel. The vulnerability affects all releases of the xeniface driver. Patches are available from the Xen Project, and a PowerShell mitigation script has been provided to apply security descriptors to existing registry and device objects.
Affected products
- Xen Project Windows PV drivers All versions
Timeline
- 2025-05-27: disclosed: Initial public release of XSA-468
- 2025-05-27: patched: Patches released for xenbus, xencons, and xeniface
- 2026-07-09: advisory: NVD publication date