CVE-2018-5244 Denial of service in n/a
Guest OS administrators can cause host memory exhaustion and denial of service by repeatedly rebooting virtual machines due to a memory leak in Xen.
- 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-2018-5244?
CVE-2018-5244 is a medium-severity denial of service vulnerability in Xen Xen, published on 5 Jan 2018. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In Xen 4.10, new infrastructure was introduced as part of an overhaul to how MSR emulation happens for guests. Unfortunately, one tracking structure isn't freed when a vcpu is destroyed. This allows guest OS administrators to cause a denial of service (host OS memory consumption) by rebooting many times.
Weakness: CWE-119
Which versions are affected by CVE-2018-5244?
It affects 1 product.
Products include Xen Xen.
How do I fix CVE-2018-5244?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2018-5244 being exploited?
There is no known exploitation of CVE-2018-5244 in the wild and no public exploit code.
Other vulnerabilities in Xen Xen
Sources
Also known as ALPINE-CVE-2018-5244, GHSA-3r9m-2j47-xq4r.