CVE-2025-27463 WinPVDrivers: Excessive permissions on user-exposed devices
Unprivileged users can access XenIface devices due to missing security descriptors, potentially leading to privilege escalation or security bypass.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-27463?
CVE-2025-27463 is a critical missing authorization vulnerability in Xen Windows PV drivers, published on 9 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
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
Weakness: CWE-276
Which versions are affected by CVE-2025-27463?
How do I fix CVE-2025-27463?
Apply the vendor's patch.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2025-27463 being exploited?
There is no known exploitation of CVE-2025-27463 in the wild and no public exploit code.
Sources
Also known as GHSA-j273-68h8-x289.