CVE-2020-29486

Description

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.

How to fix CVE-2020-29486

To remediate CVE-2020-29486, upgrade the affected package to a fixed version below.

• —upgrade to 4.13.2-r3 or later
• —upgrade to 4.14.0+88-g1d1d1f5391-1 or later

Is CVE-2020-29486 being exploited?

Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 4.13.2-r3
• from 0, < 4.14.0+88-g1d1d1f5391-1

CVSS scores

References (2)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2020-29486
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2020-29486