CVE-2026-23231High· 7.8▾ MidnightPoC availableIn 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())…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 42.9 · likelihood 0.2 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Public exploit / PoC code seen in 1 source. Availability, not in-the-wild use.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Sep 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.8%
Exploit-DB (last check)
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:
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.
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.
Linux >= 91c7b38dc9f0de4f7f444b796d14476bc12df7bc < 2a6586ecfa4ce1413daaafee250d2590e05f1a33Linux >= 91c7b38dc9f0de4f7f444b796d14476bc12df7bc < 7017745068a9068904e1e7a1b170a5785647cc81Linux >= 91c7b38dc9f0de4f7f444b796d14476bc12df7bc < f3fe58ce37926a10115ede527d59b91bcc05400aLinux >= 91c7b38dc9f0de4f7f444b796d14476bc12df7bc < dbd0af8083dd201f07c49110b2ee93710abdff28Linux >= 91c7b38dc9f0de4f7f444b796d14476bc12df7bc < 2f9a4ffeb763aec822f8ff3d1e82202d27d46d4bLinux >= 91c7b38dc9f0de4f7f444b796d14476bc12df7bc < 71e99ee20fc3f662555118cf1159443250647533Linux 3.16Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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