From d98cc35b49400a2eb9acf139ac7a9509e511475a Mon Sep 17 00:00:00 2001 From: Anmol Jain Date: Wed, 30 Jul 2025 10:01:43 +0000 Subject: [PATCH] netfilter: nf_tables: skip bound chain on rule flush jira VULN-6585 cve CVE-2023-3777 commit-author Pablo Neira Ayuso commit 6eaf41e87a223ae6f8e7a28d6e78384ad7e407f8 Skip bound chain when flushing table rules, the rule that owns this chain releases these objects. Otherwise, the following warning is triggered: WARNING: CPU: 2 PID: 1217 at net/netfilter/nf_tables_api.c:2013 nf_tables_chain_destroy+0x1f7/0x210 [nf_tables] CPU: 2 PID: 1217 Comm: chain-flush Not tainted 6.1.39 #1 RIP: 0010:nf_tables_chain_destroy+0x1f7/0x210 [nf_tables] Fixes: d0e2c7de92c7 ("netfilter: nf_tables: add NFT_CHAIN_BINDING") Reported-by: Kevin Rich Signed-off-by: Pablo Neira Ayuso Signed-off-by: Florian Westphal (cherry picked from commit 6eaf41e87a223ae6f8e7a28d6e78384ad7e407f8) Signed-off-by: Anmol Jain --- net/netfilter/nf_tables_api.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index 015f13c824667..0e9c0a6c8efd2 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -3729,6 +3729,8 @@ static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info, list_for_each_entry(chain, &table->chains, list) { if (!nft_is_active_next(net, chain)) continue; + if (nft_chain_is_bound(chain)) + continue; ctx.chain = chain; err = nft_delrule_by_chain(&ctx);