CVE-2015-7971 Denial of service in n/a

Low 2.1 Published 30 Oct 2015 Updated 6 Aug 2024

Local guests can cause a denial of service in the Xen hypervisor by sending crafted profiling hypercalls that trigger excessive console logging.

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-2015-7971?

CVE-2015-7971 is a low-severity denial of service vulnerability in Xen Xen, published on 30 Oct 2015. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

Xen 3.2.x through 4.6.x does not limit the number of printk console messages when logging certain pmu and profiling hypercalls, which allows local guests to cause a denial of service via a sequence of crafted (1) HYPERCALL_xenoprof_op hypercalls, which are not properly handled in the do_xenoprof_op function in common/xenoprof.c, or (2) HYPERVISOR_xenpmu_op hypercalls, which are not properly handled in the do_xenpmu_op function in arch/x86/cpu/vpmu.c.

Weakness: CWE-19

Which versions are affected by CVE-2015-7971?

It affects 1 product.

Products include Xen Xen.

How do I fix CVE-2015-7971?

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-2015-7971 being exploited?

There is no known exploitation of CVE-2015-7971 in the wild and no public exploit code.

All Xen Xen vulnerabilities

Sources

Also known as DEBIAN-CVE-2015-7971, GHSA-p377-fgpq-vgvx, UBUNTU-CVE-2015-7971.