CVE-2024-27019: netfilter: nf_tables: Fix potential data-race in __nft_obj_type_get()

Severity: medium (CVSS 4.7 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 2026-08-04
Weakness: CWE-362

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: Fix potential data-race in __nft_obj_type_get() nft_unregister_obj() can concurrent with __nft_obj_type_get(), and there is not any protection when iterate over nf_tables_objects list in __nft_obj_type_get(). Therefore, there is potential data-race of nf_tables_objects list entry. Use list_for_each_entry_rcu() to iterate over nf_tables_objects list in __nft_obj_type_get(), and use rcu_read_lock() in the caller nft_obj_type_get() to protect the entire type query process.

Affected products

Fedoraproject Fedora: 38, 39, 40
Linux kernel: from 4.10 before 5.15.157; from 5.16 before 6.1.88; from 6.2 before 6.6.29; from 6.7 before 6.8.8; 6.9-rc1, 6.9-rc2, 6.9-rc3, 6.9-rc4 — fixed in 5.15.157, 6.1.88, 6.6.29, 6.8.8

How to fix

Upgrade to a fixed version: Linux kernel 5.15.157, 6.1.88, 6.6.29, 6.8.8. Check the vendor advisory for mitigations.

References

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