CVE-2024-27020: Linux Kernel

High severity, CVSS 7.0. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Linux Linux Kernel: from 3.13, before 4.19.313 (fixed in 4.19.313); from 4.20, before 5.4.275 (fixed in 5.4.275); from 5.5, before 5.10.216 (fixed in 5.10.216); from 5.11, before 5.15.157 (fixed in 5.15.157); from 5.16, before 6.1.88 (fixed in 6.1.88); from 6.2, before 6.6.29 (fixed in 6.6.29); …

Published 2024-05-01. Last modified 2026-08-04.