Status: IN
Polyinstantiated directories in SELinux isolate /tmp, /var/tmp, and home directories per-user, preventing race condition attacks and information leaks. Instance directories (/tmp-inst/, /var/tmp/tmp-inst/) hold per-user subdirectories that get bind-mounted over the shared paths.
Source: repo:entries/2026/03/04/en-documentation-red_hat_enterprise_linux-9-html-using_selinux-configuring-polyi.md