Bugzilla – Bug 1223815
VUL-0: CVE-2024-27020: kernel: netfilter: nf_tables: Fix potential data-race in __nft_expr_type_get()
Last modified: 2024-07-17 18:23:52 UTC
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. References: http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-27020 https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2024/CVE-2024-27020.mbox https://git.kernel.org/stable/c/0b6de00206adbbfc6373b3ae38d2a6f197987907 https://git.kernel.org/stable/c/8d56bad42ac4c43c6c72ddd6a654a2628bf839c5 https://git.kernel.org/stable/c/a9ebf340d123ae12582210407f879d6a5a1bc25b https://git.kernel.org/stable/c/01f1a678b05ade4b1248019c2dcca773aebbeb7f https://git.kernel.org/stable/c/f969eb84ce482331a991079ab7a5c4dc3b7f89bf https://www.cve.org/CVERecord?id=CVE-2024-27020 https://bugzilla.redhat.com/show_bug.cgi?id=2278256 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4EZ6PJW7VOZ224TD7N4JZNU6KV32ZJ53/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DAMSOZXJEPUOXW33WZYWCVAY7Z5S7OOY/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GCBZZEC7L7KTWWAS2NLJK6SO3IZIL4WW/