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linux/net/netfilter
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Inseo An 71e99ee20f 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.

Fixes: 91c7b38dc9 ("netfilter: nf_tables: use new transaction infrastructure to handle chain")
Signed-off-by: Inseo An <y0un9sa@gmail.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
 		2026-02-17 15:04:20 +01:00
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ipset
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ipvs ipvs: do not keep dest_dst if dev is going down 2026-02-17 15:04:20 +01:00
Kconfig
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Makefile netfilter: flowtable: move path discovery infrastructure to its own file 2025-11-27 23:59:43 +00:00
core.c
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nf_bpf_link.c
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nf_conncount.c netfilter: nf_conncount: fix tracking of connections from localhost 2026-01-20 16:23:38 +01:00
nf_conntrack_acct.c
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nf_conntrack_amanda.c netfilter: annotate NAT helper hook pointers with __rcu 2026-02-17 15:04:20 +01:00
nf_conntrack_bpf.c Networking changes for 7.0 2026-02-11 19:31:52 -08:00
nf_conntrack_broadcast.c
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nf_conntrack_core.c netfilter: conntrack: warn when cleanup is stuck 2025-12-10 01:15:27 -08:00
nf_conntrack_ecache.c
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nf_conntrack_expect.c
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nf_conntrack_extend.c
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nf_conntrack_ftp.c netfilter: annotate NAT helper hook pointers with __rcu 2026-02-17 15:04:20 +01:00
nf_conntrack_h323_asn1.c
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nf_conntrack_h323_main.c netfilter: nf_conntrack_h323: don't pass uninitialised l3num value 2026-02-17 15:04:20 +01:00
nf_conntrack_h323_types.c
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nf_conntrack_helper.c
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nf_conntrack_irc.c netfilter: annotate NAT helper hook pointers with __rcu 2026-02-17 15:04:20 +01:00
nf_conntrack_labels.c
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nf_conntrack_netbios_ns.c
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nf_conntrack_netlink.c netfilter: nf_conntrack: don't rely on implicit includes 2026-01-20 16:23:37 +01:00
nf_conntrack_ovs.c net/ipv6: Introduce payload_len helpers 2026-02-06 20:50:03 -08:00
nf_conntrack_pptp.c
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nf_conntrack_proto.c
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nf_conntrack_proto_generic.c netfilter: nf_conntrack: Add allow_clash to generic protocol handler 2026-01-20 16:23:37 +01:00
nf_conntrack_proto_gre.c netfilter: nf_conntrack: don't rely on implicit includes 2026-01-20 16:23:37 +01:00
nf_conntrack_proto_icmp.c netfilter: nf_conntrack: enable icmp clash support 2026-01-20 16:23:37 +01:00
nf_conntrack_proto_icmpv6.c netfilter: nf_conntrack: enable icmp clash support 2026-01-20 16:23:37 +01:00
nf_conntrack_proto_sctp.c
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nf_conntrack_proto_tcp.c
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nf_conntrack_proto_udp.c
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nf_conntrack_sane.c
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nf_conntrack_seqadj.c
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nf_conntrack_sip.c
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nf_conntrack_snmp.c netfilter: annotate NAT helper hook pointers with __rcu 2026-02-17 15:04:20 +01:00
nf_conntrack_standalone.c
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nf_conntrack_tftp.c netfilter: annotate NAT helper hook pointers with __rcu 2026-02-17 15:04:20 +01:00
nf_conntrack_timeout.c
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nf_conntrack_timestamp.c
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nf_dup_netdev.c
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nf_flow_table_bpf.c bpf: Remove redundant KF_TRUSTED_ARGS flag from all kfuncs 2026-01-02 12:04:28 -08:00
nf_flow_table_core.c netfilter: flowtable: dedicated slab for flow entry 2026-02-06 13:34:55 +01:00
nf_flow_table_inet.c
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nf_flow_table_ip.c netfilter: flowtable: Add IP6IP6 tx sw acceleration 2026-01-29 09:52:06 +01:00
nf_flow_table_offload.c netfilter: nf_conntrack: don't rely on implicit includes 2026-01-20 16:23:37 +01:00
nf_flow_table_path.c netfilter: nf_conntrack: don't rely on implicit includes 2026-01-20 16:23:37 +01:00
nf_flow_table_procfs.c
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nf_flow_table_xdp.c
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nf_hooks_lwtunnel.c
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nf_internals.h
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nf_log.c netfilter: replace -EEXIST with -EBUSY 2026-01-01 11:31:48 +01:00
nf_log_syslog.c net/ipv6: Introduce payload_len helpers 2026-02-06 20:50:03 -08:00
nf_nat_amanda.c
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nf_nat_bpf.c bpf: Remove redundant KF_TRUSTED_ARGS flag from all kfuncs 2026-01-02 12:04:28 -08:00
nf_nat_core.c netfilter: nf_nat: remove bogus direction check 2025-12-11 13:08:37 +01:00
nf_nat_ftp.c
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nf_nat_helper.c
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nf_nat_irc.c
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nf_nat_masquerade.c
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nf_nat_ovs.c netfilter: nf_conntrack: don't rely on implicit includes 2026-01-20 16:23:37 +01:00
nf_nat_proto.c netfilter: nf_conntrack: don't rely on implicit includes 2026-01-20 16:23:37 +01:00
nf_nat_redirect.c
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nf_nat_sip.c
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nf_nat_tftp.c
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nf_queue.c
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nf_sockopt.c
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nf_synproxy_core.c netfilter: don't include xt and nftables.h in unrelated subsystems 2026-01-20 16:23:37 +01:00
nf_tables_api.c netfilter: nf_tables: fix use-after-free in nf_tables_addchain() 2026-02-17 15:04:20 +01:00
nf_tables_core.c
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nf_tables_offload.c
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nf_tables_trace.c
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nfnetlink.c
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nfnetlink_acct.c
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nfnetlink_cthelper.c
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nfnetlink_cttimeout.c
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nfnetlink_hook.c
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nfnetlink_log.c
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nfnetlink_osf.c
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nfnetlink_queue.c netfilter: nfnetlink_queue: do shared-unconfirmed check before segmentation 2026-02-06 13:34:55 +01:00
nft_bitwise.c
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nft_byteorder.c
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nft_chain_filter.c
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nft_chain_nat.c
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nft_chain_route.c
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nft_cmp.c
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nft_compat.c netfilter: nft_compat: add more restrictions on netlink attributes 2026-01-20 16:23:37 +01:00
nft_connlimit.c netfilter: nft_connlimit: add support to object update operation 2025-11-28 00:06:43 +00:00
nft_counter.c netfilter: nft_counter: serialize reset with spinlock 2026-02-17 15:04:20 +01:00
nft_ct.c
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nft_ct_fast.c
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nft_dup_netdev.c
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nft_dynset.c
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nft_exthdr.c
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nft_fib.c
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nft_fib_inet.c
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nft_fib_netdev.c
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nft_flow_offload.c netfilter: nf_conntrack: don't rely on implicit includes 2026-01-20 16:23:37 +01:00
nft_fwd_netdev.c
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nft_hash.c
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nft_immediate.c
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nft_inner.c
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nft_last.c
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nft_limit.c
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nft_log.c audit: add audit_log_nf_skb helper function 2025-12-16 11:04:14 -05:00
nft_lookup.c
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nft_masq.c
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nft_meta.c
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nft_nat.c
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nft_numgen.c
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nft_objref.c
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nft_osf.c
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nft_payload.c
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nft_queue.c
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nft_quota.c netfilter: nft_quota: use atomic64_xchg for reset 2026-02-17 15:04:20 +01:00
nft_range.c
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nft_redir.c
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nft_reject.c
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nft_reject_inet.c
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nft_reject_netdev.c
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nft_rt.c
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nft_set_bitmap.c
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nft_set_hash.c netfilter: nft_set_hash: fix get operation on big endian 2026-02-06 13:34:55 +01:00
nft_set_pipapo.c netfilter: nf_tables: add .abort_skip_removal flag for set types 2026-01-22 17:18:13 +01:00
nft_set_pipapo.h
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nft_set_pipapo_avx2.c
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nft_set_pipapo_avx2.h
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nft_set_rbtree.c netfilter: nft_set_rbtree: validate open interval overlap 2026-02-06 13:36:07 +01:00
nft_socket.c
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nft_synproxy.c netfilter: don't include xt and nftables.h in unrelated subsystems 2026-01-20 16:23:37 +01:00
nft_tproxy.c
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nft_tunnel.c
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nft_xfrm.c
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utils.c
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x_tables.c netfilter: replace -EEXIST with -EBUSY 2026-01-01 11:31:48 +01:00
xt_AUDIT.c audit: add audit_log_nf_skb helper function 2025-12-16 11:04:14 -05:00
xt_CHECKSUM.c
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xt_CLASSIFY.c
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xt_CONNSECMARK.c
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xt_CT.c
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xt_DSCP.c
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xt_HL.c
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xt_HMARK.c
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xt_IDLETIMER.c
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xt_LED.c
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xt_LOG.c
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xt_MASQUERADE.c
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xt_NETMAP.c
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xt_NFLOG.c
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xt_NFQUEUE.c
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xt_RATEEST.c
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xt_REDIRECT.c
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xt_SECMARK.c
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xt_TCPMSS.c
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xt_TCPOPTSTRIP.c
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xt_TEE.c
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xt_TPROXY.c
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xt_TRACE.c
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xt_addrtype.c
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xt_bpf.c
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xt_cgroup.c
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xt_cluster.c
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xt_comment.c
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xt_connbytes.c
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xt_connlabel.c
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xt_connlimit.c netfilter: nf_conncount: rework API to use sk_buff directly 2025-11-28 00:05:49 +00:00
xt_connmark.c
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xt_conntrack.c
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xt_cpu.c
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xt_dccp.c
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xt_devgroup.c
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xt_dscp.c
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xt_ecn.c
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xt_esp.c
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xt_hashlimit.c
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xt_helper.c
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xt_hl.c
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xt_ipcomp.c
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xt_iprange.c
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xt_ipvs.c
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xt_l2tp.c
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xt_length.c
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xt_limit.c
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xt_mac.c
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xt_mark.c
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xt_multiport.c
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xt_nat.c
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xt_nfacct.c
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xt_osf.c
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xt_owner.c
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xt_physdev.c
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xt_pkttype.c
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xt_policy.c
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xt_quota.c
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xt_rateest.c
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xt_realm.c
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xt_recent.c
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xt_repldata.h
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xt_sctp.c
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xt_set.c
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xt_socket.c
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xt_state.c
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xt_statistic.c
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xt_string.c
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xt_tcpmss.c netfilter: xt_tcpmss: check remaining length before reading optlen 2026-01-20 16:23:38 +01:00
xt_tcpudp.c
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xt_time.c netfilter: xt_time: use is_leap_year() helper 2026-01-29 09:52:07 +01:00
xt_u32.c
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