CVE-2015-6855 Denial of service in n/a
A guest user can crash the QEMU instance by sending specific IDE commands to an ATAPI device, causing a divide-by-zero error.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2015-6855?
CVE-2015-6855 is a high-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 6 Nov 2015. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
hw/ide/core.c in QEMU does not properly restrict the commands accepted by an ATAPI device, which allows guest users to cause a denial of service or possibly have unspecified other impact via certain IDE commands, as demonstrated by a WIN_READ_NATIVE_MAX command to an empty drive, which triggers a divide-by-zero error and instance crash.
Weakness: CWE-369
Which versions are affected by CVE-2015-6855?
It affects 7 products.
Products include Arista Eos, Canonical Ubuntu Linux, Debian Debian Linux, Fedoraproject Fedora, Qemu Qemu, Suse Linux Enterprise Desktop and 1 more.
How do I fix CVE-2015-6855?
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-2015-6855 being exploited?
There is no known exploitation of CVE-2015-6855 in the wild and no public exploit code.
Other vulnerabilities in Canonical Ubuntu Linux
Sources
Also known as DEBIAN-CVE-2015-6855, GHSA-8gcq-wcj5-xgq6, UBUNTU-CVE-2015-6855.