Red Hat: CVE-2021-20321: Moderate: kernel security and bug fix update (Multiple Advisories)

Description
A race condition accessing file object in the Linux kernel OverlayFS subsystem was found in the way users do rename in specific way with OverlayFS. A local user could use this flaw to crash the system.
Solution(s)
redhat-upgrade-kernel
redhat-upgrade-kernel-rt

References
CVE-2021-20321
RHSA-2021:5227
RHSA-2021:5241