CVE-2019-19581 Denial of service in n/a
A malicious 32-bit Arm guest can crash the Xen hypervisor via out-of-bounds access, causing a denial of service.
- 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-2019-19581?
CVE-2019-19581 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 32-bit Arm guest OS users to cause a denial of service (out-of-bounds access) 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 32-bit Arm accesses to bitmaps with bit a count which is a multiple of 32, an out of bounds access may occur. A malicious guest may cause a hypervisor crash or hang, resulting in a Denial of Service (DoS). All versions of Xen are vulnerable. 32-bit Arm systems are vulnerable. 64-bit Arm systems are not vulnerable.
Weakness: CWE-119
Which versions are affected by CVE-2019-19581?
It affects 2 products.
Products include Fedoraproject Fedora, Xen Xen.
How do I fix CVE-2019-19581?
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-2019-19581 being exploited?
There is no known exploitation of CVE-2019-19581 in the wild and no public exploit code.
Other vulnerabilities in Fedoraproject Fedora
Sources
Also known as DEBIAN-CVE-2019-19581, GHSA-h398-v6mj-crpf, UBUNTU-CVE-2019-19581.