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

Summary

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.

Timeline

1. May 1, 2024, 5:30 AM UTCCVE published
2. Oct 30, 2024, 7:26 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: total

3. Oct 15, 2026, 12:39 AM UTCRecord last updated

Affected versions

• Linux Linux

  From ef1f7df9170dbd875ce198ba84e6ab80f6fc139e · fixed in 939109c0a8e2a006a6cc8209e262d25065f4403a; From ef1f7df9170dbd875ce198ba84e6ab80f6fc139e · fixed in b38a133d37fa421c8447b383d788c9cc6f5cb34c; From ef1f7df9170dbd875ce198ba84e6ab80f6fc139e · fixed in 934e66e231cff2b18faa2c8aad0b8cec13957e05; From ef1f7df9170dbd875ce198ba84e6ab80f6fc139e · fixed in 0b6de00206adbbfc6373b3ae38d2a6f197987907; From ef1f7df9170dbd875ce198ba84e6ab80f6fc139e · fixed in 8d56bad42ac4c43c6c72ddd6a654a2628bf839c5; From ef1f7df9170dbd875ce198ba84e6ab80f6fc139e · fixed in a9ebf340d123ae12582210407f879d6a5a1bc25b; From ef1f7df9170dbd875ce198ba84e6ab80f6fc139e · fixed in 01f1a678b05ade4b1248019c2dcca773aebbeb7f; From ef1f7df9170dbd875ce198ba84e6ab80f6fc139e · fixed in f969eb84ce482331a991079ab7a5c4dc3b7f89bf

• Linux Linux

  3.13

• KernelLinux

  From 3.13.0 · fixed in 4.19.313; From 4.20.0 · fixed in 5.4.275; From 5.5.0 · fixed in 5.10.216; From 5.11.0 · fixed in 5.15.157; From 5.16.0 · fixed in 6.1.88; From 6.2.0 · fixed in 6.6.29; From 6.7.0 · fixed in 6.8.8

References 8