CVE-2024-27020: netfilter: nf_tables: Fix potential data-race in __nft_expr_type_get()

Severity: high (CVSS 7.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-05-01 · updated 2026-10-15
Weakness: CWE-362

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.

Affected products

Linux kernel: from 3.13 before 4.19.313; from 4.20 before 5.4.275; from 5.5 before 5.10.216; from 5.11 before 5.15.157; from 5.16 before 6.1.88; from 6.2 before 6.6.29 — fixed in 4.19.313, 5.10.216, 5.15.157, 5.4.275, 6.1.88, 6.6.29

How to fix

Upgrade to a fixed version: Linux kernel 4.19.313, 5.10.216, 5.15.157, 5.4.275. Check the vendor advisory for mitigations.

References

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