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Date: Wed, 1 May 2024 07:31:21 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2024-27020: netfilter: nf_tables: Fix potential data-race in __nft_expr_type_get() 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. The Linux kernel CVE team has assigned CVE-2024-27020 to this issue. Affected and fixed versions =========================== Issue introduced in 3.13 with commit ef1f7df9170d and fixed in 5.15.157 with commit 0b6de00206ad Issue introduced in 3.13 with commit ef1f7df9170d and fixed in 6.1.88 with commit 8d56bad42ac4 Issue introduced in 3.13 with commit ef1f7df9170d and fixed in 6.6.29 with commit a9ebf340d123 Issue introduced in 3.13 with commit ef1f7df9170d and fixed in 6.8.8 with commit 01f1a678b05a Issue introduced in 3.13 with commit ef1f7df9170d and fixed in 6.9-rc5 with commit f969eb84ce48 Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2024-27020 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: net/netfilter/nf_tables_api.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: 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
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