CVE-2018-18883 Null dereference in n/a

High 8.8 Published 1 Nov 2018 Updated 5 Aug 2024

Guest VMs can crash the Xen hypervisor host via a null pointer dereference due to improper nested VT-x restrictions.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2018-18883?

CVE-2018-18883 is a high-severity vulnerability in Xen Xen, published on 1 Nov 2018. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

An issue was discovered in Xen 4.9.x through 4.11.x, on Intel x86 platforms, allowing x86 HVM and PVH guests to cause a host OS denial of service (NULL pointer dereference) or possibly have unspecified other impact because nested VT-x is not properly restricted.

Weakness: CWE-476

Which versions are affected by CVE-2018-18883?

It affects 1 product.

Products include Xen Xen.

How do I fix CVE-2018-18883?

Apply the vendor's patch.

Is CVE-2018-18883 being exploited?

There is no known exploitation of CVE-2018-18883 in the wild and no public exploit code.

All Xen Xen vulnerabilities

Sources

Also known as ALPINE-CVE-2018-18883, DEBIAN-CVE-2018-18883, GHSA-7xx2-fw34-h693, UBUNTU-CVE-2018-18883.