CVE-2018-19963 Denial of service in n/a

High 7.8 Published 8 Dec 2018 Updated 5 Aug 2024

A flaw in Xen's IOREQ server resource accounting allows guest users to crash the host or potentially escalate privileges.

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-2018-19963?

CVE-2018-19963 is a high-severity denial of service vulnerability in Xen Xen, published on 8 Dec 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 4.11 allowing HVM guest OS users to cause a denial of service (host OS crash) or possibly gain host OS privileges because x86 IOREQ server resource accounting (for external emulators) was mishandled.

Weakness: CWE-617

Which versions are affected by CVE-2018-19963?

It affects 1 product.

Products include Xen Xen.

How do I fix CVE-2018-19963?

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-2018-19963 being exploited?

There is no known exploitation of CVE-2018-19963 in the wild and no public exploit code.

All Xen Xen vulnerabilities

Sources

Also known as ALPINE-CVE-2018-19963, DEBIAN-CVE-2018-19963, GHSA-fxvq-f6w2-c6gp.