CVE-2019-19582 Denial of service in n/a
A malicious guest OS can cause a hypervisor crash or hang via an infinite loop in bitmap iteration on x86 systems with 64+ nodes.
- 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-2019-19582?
CVE-2019-19582 is a medium-severity denial of service vulnerability in Fedoraproject Fedora, published on 11 Dec 2019. 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 4.12.x allowing x86 guest OS users to cause a denial of service (infinite loop) because certain bit iteration is mishandled. In a number of places bitmaps are being used by the hypervisor to track certain state. Iteration over all bits involves functions which may misbehave in certain corner cases: On x86 accesses to bitmaps with a compile time known size of 64 may incur undefined behavior, which may in particular result in infinite loops. A malicious guest may cause a hypervisor crash or hang, resulting in a Denial of Service (DoS). All versions of Xen are vulnerable. x86 systems with 64 or more nodes are vulnerable (there might not be any such systems that Xen would run on). x86 systems with less than 64 nodes are not vulnerable.
Weakness: CWE-835
Which versions are affected by CVE-2019-19582?
It affects 2 products.
Products include Fedoraproject Fedora, Xen Xen.
How do I fix CVE-2019-19582?
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-2019-19582 being exploited?
There is no known exploitation of CVE-2019-19582 in the wild and no public exploit code.
Other vulnerabilities in Fedoraproject Fedora
Sources
Also known as ALPINE-CVE-2019-19582, DEBIAN-CVE-2019-19582, GHSA-wv8f-82g9-5vhw, UBUNTU-CVE-2019-19582.