Amazon Linux AMI: CVE-2024-27020: Security patch for kernel (ALAS-2024-1942)

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nf_tables: Fix potential data-race in __nft_expr_type_get()

nft_unregister_expr() can concurrent with __nft_expr_type_get(),

and there is not any protection when iterate over nf_tables_expressions

list in __nft_expr_type_get(). Therefore, there is potential data-race

of nf_tables_expressions list entry.

Use list_for_each_entry_rcu() to iterate over nf_tables_expressions

list in __nft_expr_type_get(), and use rcu_read_lock() in the caller

nft_expr_type_get() to protect the entire type query process.