Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 91c7b38dc9f0de4f7f444b796d14476bc12df7bc before 2a6586ecfa4ce1413daaafee250d2590e05f1a33; affected 91c7b38dc9f0de4f7f444b796d14476bc12df7bc before 7017745068a9068904e1e7a1b170a5785647cc81; affected 91c7b38dc9f0de4f7f444b796d14476bc12df7bc before f3fe58ce37926a10115ede527d59b91bcc05400a; affected 91c7b38dc9f0de4f7f444b796d14476bc12df7bc before dbd0af8083dd201f07c49110b2ee93710abdff28; affected 91c7b38dc9f0de4f7f444b796d14476bc12df7bc before 2f9a4ffeb763aec822f8ff3d1e82202d27d46d4b; affected 91c7b38dc9f0de4f7f444b796d14476bc12df7bc before 71e99ee20fc3f662555118cf1159443250647533 |
| Linux / Linux | affected 3.16; unaffected 0 before 3.16; unaffected 6.1.165 through 6.1.*; unaffected 6.6.128 through 6.6.*; unaffected 6.12.75 through 6.12.*; unaffected 6.18.14 through 6.18.*; unaffected 6.19.4 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
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
ADP enrichment
No English description supplied.
- 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
No English description supplied.
No references supplied.