kernel is vulnerable to use-after-free. It is possible because of a flaw in debugfs_remove.
lists.opensuse.org/opensuse-security-announce/2020-04/msg00035.html
access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.3_release_notes/index
access.redhat.com/errata/RHSA-2020:4609
access.redhat.com/security/updates/classification/#moderate
bugzilla.kernel.org/show_bug.cgi?id=205713
lists.debian.org/debian-lts-announce/2020/12/msg00015.html
lore.kernel.org/linux-block/[email protected]/
security.netapp.com/advisory/ntap-20200103-0001/