CVE-2016-6259 Denial of service in n/a
Local 32-bit PV guest kernels can crash the hypervisor and VMs by triggering a safety check due to missing SMAP whitelisting.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2016-6259?
CVE-2016-6259 is a medium-severity denial of service vulnerability in Citrix Xenserver, published on 2 Aug 2016. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Xen 4.5.x through 4.7.x do not implement Supervisor Mode Access Prevention (SMAP) whitelisting in 32-bit exception and event delivery, which allows local 32-bit PV guest OS kernels to cause a denial of service (hypervisor and VM crash) by triggering a safety check.
Weakness: CWE-20
Which versions are affected by CVE-2016-6259?
It affects 2 products.
Products include Citrix Xenserver, Xen Xen.
How do I fix CVE-2016-6259?
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-2016-6259 being exploited?
There is no known exploitation of CVE-2016-6259 in the wild and no public exploit code.
Other vulnerabilities in Citrix Xenserver
Sources
Also known as ALPINE-CVE-2016-6259, DEBIAN-CVE-2016-6259, GHSA-prj4-495w-f4qv, UBUNTU-CVE-2016-6259.