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A race condition in the Linux kernel netfilter nf_tables subsystem could occur during flowtable type lookup. The issue is in the interaction between __nft_flowtable_type_get(), which iterates over the nf_tables_flowtables list during nf_tables_newflowtable(), and nft_unregister_flowtable_type() during nf_flow_inet_module_exit(), which can concurrently unregister entries from the same list. The list traversal in __nft_flowtable_type_get() lacked appropriate synchronization, creating a potential data race on nf_tables_flowtables list entries. The fix uses RCU-safe list iteration in __nft_flowtable_type_get() and wraps the lookup path with an RCU read-side critical section in nft_flowtable_type_get() to protect the full type query operation.
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