kernel-rt is vulnerable to denial of service. The vulnerability exists because the double free happens during flush procedure, and no use of incorrect data during flush finishing even if double free could happen without kernel crash.
www.openwall.com/lists/oss-security/2021/05/25/1
www.openwall.com/lists/oss-security/2021/06/01/2
access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.5_release_notes/
access.redhat.com/errata/RHSA-2021:4356
access.redhat.com/security/updates/classification/#moderate
bugzilla.redhat.com/show_bug.cgi?id=1964139
lists.debian.org/debian-lts-announce/2021/06/msg00019.html
lists.debian.org/debian-lts-announce/2021/06/msg00020.html
www.openwall.com/lists/oss-security/2021/05/25/1