CVE-2025-27466 Mutiple vulnerabilities in the Viridian interface
A NULL pointer dereference in the Xen hypervisor's Viridian interface allows a guest to cause a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-27466?
CVE-2025-27466 is a critical vulnerability in Xen Xen, published on 11 Sep 2025. An attacker can exploit it over the internet without logging in, 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.]
There are multiple issues related to the handling and accessing of guest memory pages in the viridian code:
1. A NULL pointer dereference in the updating of the reference TSC area. This is CVE-2025-27466.
2. A NULL pointer dereference by assuming the SIM page is mapped when a synthetic timer message has to be delivered. This is CVE-2025-58142.
3. A race in the mapping of the reference TSC page, where a guest can get Xen to free a page while still present in the guest physical to machine (p2m) page tables. This is CVE-2025-58143.
Weakness: CWE-395
Which versions are affected by CVE-2025-27466?
It affects 1 product.
Products include Xen Xen.
How do I fix CVE-2025-27466?
Apply the vendor's patch.
Is CVE-2025-27466 being exploited?
There is no known exploitation of CVE-2025-27466 in the wild and no public exploit code.
Other vulnerabilities in Xen Xen
Sources
Also known as ALPINE-CVE-2025-27466, DEBIAN-CVE-2025-27466, GHSA-wx7g-7g56-c87j, UBUNTU-CVE-2025-27466.