kernel/1108-netfilter-conntrack-add-missing-netlink-policy-validations.patch

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From 3579bfdd048b5391909e01eae2e7bfb5d742b97b Mon Sep 17 00:00:00 2001
From: Florian Westphal <fwestpha@redhat.com>
Date: Wed, 13 May 2026 17:15:58 +0200
Subject: [PATCH] netfilter: conntrack: add missing netlink policy validations
JIRA: https://redhat.atlassian.net/browse/RHEL-168848
Upstream Status: commit f900e1d77ee0
commit f900e1d77ee0ef87bfb5ab3fe60f0b3d8ad5ba05
Author: Florian Westphal <fw@strlen.de>
Date: Tue Mar 10 00:28:29 2026 +0100
netfilter: conntrack: add missing netlink policy validations
Hyunwoo Kim reports out-of-bounds access in sctp and ctnetlink.
These attributes are used by the kernel without any validation.
Extend the netlink policies accordingly.
Quoting the reporter:
nlattr_to_sctp() assigns the user-supplied CTA_PROTOINFO_SCTP_STATE
value directly to ct->proto.sctp.state without checking that it is
within the valid range. [..]
and: ... with exp->dir = 100, the access at
ct->master->tuplehash[100] reads 5600 bytes past the start of a
320-byte nf_conn object, causing a slab-out-of-bounds read confirmed by
UBSAN.
Fixes: 076a0ca02644 ("netfilter: ctnetlink: add NAT support for expectations")
Fixes: a258860e01b8 ("netfilter: ctnetlink: add full support for SCTP to ctnetlink")
Reported-by: Hyunwoo Kim <imv4bel@gmail.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Florian Westphal <fwestpha@redhat.com>
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 399227e..527bf07 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -3518,7 +3518,7 @@ ctnetlink_change_expect(struct nf_conntrack_expect *x,
#if IS_ENABLED(CONFIG_NF_NAT)
static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
- [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
+ [CTA_EXPECT_NAT_DIR] = NLA_POLICY_MAX(NLA_BE32, IP_CT_DIR_REPLY),
[CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
};
#endif
diff --git a/net/netfilter/nf_conntrack_proto_sctp.c b/net/netfilter/nf_conntrack_proto_sctp.c
index 4cc97f9..fabb2c1 100644
--- a/net/netfilter/nf_conntrack_proto_sctp.c
+++ b/net/netfilter/nf_conntrack_proto_sctp.c
@@ -587,7 +587,8 @@ static int sctp_to_nlattr(struct sk_buff *skb, struct nlattr *nla,
}
static const struct nla_policy sctp_nla_policy[CTA_PROTOINFO_SCTP_MAX+1] = {
- [CTA_PROTOINFO_SCTP_STATE] = { .type = NLA_U8 },
+ [CTA_PROTOINFO_SCTP_STATE] = NLA_POLICY_MAX(NLA_U8,
+ SCTP_CONNTRACK_HEARTBEAT_SENT),
[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL] = { .type = NLA_U32 },
[CTA_PROTOINFO_SCTP_VTAG_REPLY] = { .type = NLA_U32 },
};