Vulnerability CVE-2024-27020
Published: 2024-05-01

Description:
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.

 References:
https://git.kernel.org/stable/c/0b6de00206adbbfc6373b3ae38d2a6f197987907
https://git.kernel.org/stable/c/8d56bad42ac4c43c6c72ddd6a654a2628bf839c5
https://git.kernel.org/stable/c/a9ebf340d123ae12582210407f879d6a5a1bc25b
https://git.kernel.org/stable/c/01f1a678b05ade4b1248019c2dcca773aebbeb7f
https://git.kernel.org/stable/c/f969eb84ce482331a991079ab7a5c4dc3b7f89bf
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