This security bulletin contains one low risk vulnerability.
Exploit availability: NoDescription
The vulnerability allows a local privileged user to a crash the entire system.
An issue was discovered in Xen through 4.14.x. Nodes in xenstore have an ownership. In oxenstored, a owner could give a node away. However, node ownership has quota implications. Any guest can run another guest out of quota, or create an unbounded number of nodes owned by dom0, thus running xenstored out of memory A malicious guest administrator can cause a denial of service against a specific guest or against the whole host. All systems using oxenstored are vulnerable. Building and using oxenstored is the default in the upstream Xen distribution, if the Ocaml compiler is available. Systems using C xenstored are not vulnerable.Mitigation
Install update from vendor's website.Vulnerable software versions
Xen: 4.0.0 - 4.14.1
Can this vulnerability be exploited remotely?
Is there known malware, which exploits this vulnerability?