Vulnerability CVE-2024-35898
Published: 2024-05-19

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

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

nft_unregister_flowtable_type() within nf_flow_inet_module_exit() can
concurrent with __nft_flowtable_type_get() within nf_tables_newflowtable().
And thhere is not any protection when iterate over nf_tables_flowtables
list in __nft_flowtable_type_get(). Therefore, there is pertential
data-race of nf_tables_flowtables list entry.

Use list_for_each_entry_rcu() to iterate over nf_tables_flowtables list
in __nft_flowtable_type_get(), and use rcu_read_lock() in the caller
nft_flowtable_type_get() to protect the entire type query process.

 References:
https://git.kernel.org/stable/c/69d1fe14a680042ec913f22196b58e2c8ff1b007
https://git.kernel.org/stable/c/a347bc8e6251eaee4b619da28020641eb5b0dd77
https://git.kernel.org/stable/c/940d41caa71f0d3a52df2fde5fada524a993e331
https://git.kernel.org/stable/c/2485bcfe05ee3cf9ca8923a94fa2e456924c79c8
https://git.kernel.org/stable/c/9b5b7708ec2be21dd7ef8ca0e3abe4ae9f3b083b
https://git.kernel.org/stable/c/8b891153b2e4dc0ca9d9dab8f619d49c740813df
https://git.kernel.org/stable/c/e684b1674fd1ca4361812a491242ae871d6b2859
https://git.kernel.org/stable/c/24225011d81b471acc0e1e315b7d9905459a6304
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