CVE-2020-14356

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2020-08-19 · updated 2026-06-17
Weakness: CWE-476

Description

A flaw null pointer dereference in the Linux kernel cgroupv2 subsystem in versions before 5.7.10 was found in the way when reboot the system. A local user could use this flaw to crash the system or escalate their privileges on the system.

Affected products

Canonical Ubuntu Linux: 14.04, 16.04, 18.04, 20.04
Debian Linux: 9.0
Linux kernel: from 4.5 before 4.9.231; from 4.10 before 4.14.189; from 4.15 before 4.19.134; from 4.20 before 5.4.53; from 5.5 before 5.7.10 — fixed in 4.14.189, 4.19.134, 4.9.231, 5.4.53, 5.7.10
Active IQ Unified Manager for VMware vSphere, Linux, and Microsoft Windows: all versions
NetApp Cloud Backup: all versions
NetApp Hci Management Node: all versions
NetApp Solidfire: all versions
NetApp Solidfire Baseboard Management Controller Firmware: all versions
openSUSE Leap: 15.1, 15.2
Red Hat Enterprise Linux: 8.0

How to fix

Upgrade to a fixed version: Linux kernel 4.14.189, 4.19.134, 4.9.231, 5.4.53. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2020-14356 or the next vulnerability affects your stack