Atlassian Questions for Confluence creates a Confluence user account with the username disabledsystemuser.

The disabledsystemuser account is created with a hardcoded password and is added to the confluence-users group, which allows viewing and editing all non-restricted pages within Confluence by default

A remote, unauthenticated attacker with knowledge of the hardcoded password could exploit this to log into Confluence and access any pages the confluence-users group has access to.
The bpf verifier(kernel/bpf/verifier.c) did not properly restrict several *_OR_NULL pointer types which allows these types to do pointer arithmetic. An unprivileged user could use this flaw to escalate their privileges on a system. Setting parameter "kernel.unprivileged_bpf_disabled=1" prevents such privilege escalation by restricting access to bpf(2) call.