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Test your applicationsUpgrade RHEL:8 kernel-rt-modules to version 0:4.18.0-372.32.1.rt7.189.el8_6 or higher.
This issue was patched in RHSA-2022:7134.
Note: Versions mentioned in the description apply only to the upstream kernel-rt-modules package and not the kernel-rt-modules package as distributed by RHEL.
See How to fix? for RHEL:8 relevant fixed versions and status.
It was discovered that the cls_route filter implementation in the Linux kernel would not remove an old filter from the hashtable before freeing it if its handle had the value 0.