CVE-2015-4164 Denial of service in n/a
Local 32-bit PV guest administrators can cause a system hang via a specific hypercall due to a loop iteration error in the Xen hypervisor.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2015-4164?
CVE-2015-4164 is a medium-severity denial of service vulnerability in Xen Xen, published on 15 Jun 2015. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
The compat_iret function in Xen 3.1 through 4.5 iterates the wrong way through a loop, which allows local 32-bit PV guest administrators to cause a denial of service (large loop and system hang) via a hypercall_iret call with EFLAGS.VM set.
Weakness: CWE-399
Which versions are affected by CVE-2015-4164?
It affects 1 product.
Products include Xen Xen.
How do I fix CVE-2015-4164?
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-2015-4164 being exploited?
There is no known exploitation of CVE-2015-4164 in the wild and no public exploit code.
Other vulnerabilities in Xen Xen
Sources
Also known as DEBIAN-CVE-2015-4164, GHSA-jg3g-vx8c-2j78, UBUNTU-CVE-2015-4164.