Privilege escalation in Linux kernel allowed unprivileged users with shell access to gain root access or run a DoS attack on the system.
We have integrated the fix in NRSW versions 4.5.0.105, 4.4.0.112 and 4.3.0.113.
More information:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-22555