kernel is vulnerable to denial of service. A NULL pointer reference allows a local privileged user to cause a denial of service.
access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.4_release_notes/
access.redhat.com/errata/RHSA-2021:1620
access.redhat.com/security/updates/classification/#important
bugzilla.redhat.com/show_bug.cgi?id=1930251
www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00438.html