CVE-2020-27786: Linux Kernel

High severity, CVSS 7.8. EPSS: 1.7% chance of exploitation in the next 30 days.

A flaw was found in the Linux kernel’s implementation of MIDI, where an attacker with a local account and the permissions to issue ioctl commands to midi devices could trigger a use-after-free issue. A write to this specific memory while freed and before use causes the flow of execution to change and possibly allow for memory corruption or privilege escalation. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

Affected products

• Linux Linux Kernel: before 4.4.224 (fixed in 4.4.224); from 4.5, before 4.9.224 (fixed in 4.9.224); from 4.10, before 4.14.181 (fixed in 4.14.181); from 4.15, before 4.19.124 (fixed in 4.19.124); from 4.20, before 5.4.42 (fixed in 5.4.42); from 5.5, before 5.6.14 (fixed in 5.6.14)
• Netapp Cloud Backup: affected versions not specified
• Netapp Solidfire Baseboard Management Controller: affected versions not specified
• Red Hat Enterprise Linux: version 7.0 only; version 8.0 only
• Red Hat Enterprise Mrg: version 2.0 only
• Red Hat Openshift Container Platform: version 4.4 only; version 4.5 only; version 4.6 only

Published 2020-12-11. Last modified 2026-06-17.