CVE-2020-25641: Canonical Ubuntu Linux

Medium severity, CVSS 5.5. EPSS: 0.4% chance of exploitation in the next 30 days.

A flaw was found in the Linux kernel's implementation of biovecs in versions before 5.9-rc7. A zero-length biovec request issued by the block subsystem could cause the kernel to enter an infinite loop, causing a denial of service. This flaw allows a local attacker with basic privileges to issue requests to a block device, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

Affected products

• Canonical Ubuntu Linux: version 18.04 only; version 20.04 only
• Debian Debian Linux: version 9.0 only
• Linux Linux Kernel: up to and including 5.8.13; version 5.9.0 only
• Opensuse Leap: version 15.1 only; version 15.2 only
• Red Hat Enterprise Linux: version 7.0 only; version 8.0 only

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