CVE-2020-29568: Debian Linux

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

An issue was discovered in Xen through 4.14.x. Some OSes (such as Linux, FreeBSD, and NetBSD) are processing watch events using a single thread. If the events are received faster than the thread is able to handle, they will get queued. As the queue is unbounded, a guest may be able to trigger an OOM in the backend. All systems with a FreeBSD, Linux, or NetBSD (any version) dom0 are vulnerable.

Affected products

• Debian Debian Linux: version 9.0 only; version 10.0 only
• Xen Xen: up to and including 4.14.1

Published 2020-12-15. Last modified 2026-06-17.