CVE-2020-27675: Debian Linux

Medium severity, CVSS 4.7. EPSS: 0.3% chance of exploitation in the next 30 days.

An issue was discovered in the Linux kernel through 5.9.1, as used with Xen through 4.14.x. drivers/xen/events/events_base.c allows event-channel removal during the event-handling loop (a race condition). This can cause a use-after-free or NULL pointer dereference, as demonstrated by a dom0 crash via events for an in-reconfiguration paravirtualized device, aka CID-073d0552ead5.

Affected products

• Debian Debian Linux: version 9.0 only
• Fedoraproject Fedora: version 31 only; version 32 only; version 33 only
• Linux Linux Kernel: up to and including 5.9.1

Published 2020-10-22. Last modified 2026-06-17.