CVE-2018-12893 Denial of service in n/a
A malicious PV guest can crash the Xen hypervisor, causing a denial of service on x86 systems.
- 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-2018-12893?
CVE-2018-12893 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 2 Jul 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 through 4.10.x. One of the fixes in XSA-260 added some safety checks to help prevent Xen livelocking with debug exceptions. Unfortunately, due to an oversight, at least one of these safety checks can be triggered by a guest. A malicious PV guest can crash Xen, leading to a Denial of Service. All Xen systems which have applied the XSA-260 fix are vulnerable. Only x86 systems are vulnerable. ARM systems are not vulnerable. Only x86 PV guests can exploit the vulnerability. x86 HVM and PVH guests cannot exploit the vulnerability. An attacker needs to be able to control hardware debugging facilities to exploit the vulnerability, but such permissions are typically available to unprivileged users.
Which versions are affected by CVE-2018-12893?
It affects 2 products.
Products include Debian Debian Linux, Xen Xen.
How do I fix CVE-2018-12893?
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-2018-12893 being exploited?
There is no known exploitation of CVE-2018-12893 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as ALPINE-CVE-2018-12893, DEBIAN-CVE-2018-12893, GHSA-7589-4cgq-4p68, UBUNTU-CVE-2018-12893.