Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: fix use-after-free in nf_tables_addchain() nf_tables_addchain() publishes the chain to table->chains via list_add_tail_rcu() (in nft_chain_add()) before registering hooks. If nf_tables_register_hook() then fails, the error path calls nft_chain_del() (list_del_rcu()) followed by nf_tables_chain_destroy() with no RCU grace period in between. This creates two use-after-free conditions: 1) Control-plane: nf_tables_dump_chains() traverses table->chains under rcu_read_lock(). A concurrent dump can still be walking the chain when the error path frees it. 2) Packet path: for NFPROTO_INET, nf_register_net_hook() briefly installs the IPv4 hook before IPv6 registration fails. Packets entering nft_do_chain() via the transient IPv4 hook can still be dereferencing chain->blob_gen_X when the error path frees the chain. Add synchronize_rcu() between nft_chain_del() and the chain destroy so that all RCU readers -- both dump threads and in-flight packet evaluation -- have finished before the chain is freed.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
91c7b38dc9f0de4f7f444b796d14476bc12df7bc to < 2a6586ecfa4ce1413daaafee250d2590e05f1a33affected91c7b38dc9f0de4f7f444b796d14476bc12df7bc to < 7017745068a9068904e1e7a1b170a5785647cc81affected91c7b38dc9f0de4f7f444b796d14476bc12df7bc to < f3fe58ce37926a10115ede527d59b91bcc05400aaffected91c7b38dc9f0de4f7f444b796d14476bc12df7bc to < dbd0af8083dd201f07c49110b2ee93710abdff28affected91c7b38dc9f0de4f7f444b796d14476bc12df7bc to < 2f9a4ffeb763aec822f8ff3d1e82202d27d46d4baffected91c7b38dc9f0de4f7f444b796d14476bc12df7bc to < 71e99ee20fc3f662555118cf1159443250647533affected
Linux Linux
Default version status: affected
3.16affected0 to < 3.16unaffected6.1.165 to ≤ 6.1.*unaffected6.6.128 to ≤ 6.6.*unaffected6.12.75 to ≤ 6.12.*unaffected6.18.14 to ≤ 6.18.*unaffected6.19.4 to ≤ 6.19.*unaffected7.0 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/2a6586ecfa4ce1413daaafee250d2590e05f1a33 ↗
- https://git.kernel.org/stable/c/7017745068a9068904e1e7a1b170a5785647cc81 ↗
- https://git.kernel.org/stable/c/f3fe58ce37926a10115ede527d59b91bcc05400a ↗
- https://git.kernel.org/stable/c/dbd0af8083dd201f07c49110b2ee93710abdff28 ↗
- https://git.kernel.org/stable/c/2f9a4ffeb763aec822f8ff3d1e82202d27d46d4b ↗
- https://git.kernel.org/stable/c/71e99ee20fc3f662555118cf1159443250647533 ↗
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-253495.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html ↗