CVE-2016-1571 Denial of service in n/a
Local HVM guest users can crash the host system via a specific instruction when shadow mode or nested virtualization is enabled.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2016-1571?
CVE-2016-1571 is a medium-severity denial of service vulnerability in Citrix Xenserver, published on 22 Jan 2016. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The paging_invlpg function in include/asm-x86/paging.h in Xen 3.3.x through 4.6.x, when using shadow mode paging or nested virtualization is enabled, allows local HVM guest users to cause a denial of service (host crash) via a non-canonical guest address in an INVVPID instruction, which triggers a hypervisor bug check.
Weakness: CWE-17
Which versions are affected by CVE-2016-1571?
It affects 2 products.
Products include Citrix Xenserver, Xen Xen.
How do I fix CVE-2016-1571?
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-2016-1571 being exploited?
There is no known exploitation of CVE-2016-1571 in the wild and no public exploit code.
Other vulnerabilities in Citrix Xenserver
Sources
Also known as DEBIAN-CVE-2016-1571, GHSA-rh8h-9p3w-xjvv, UBUNTU-CVE-2016-1571.