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Florian Westphal says: ==================== netfilter: updates for net The following patchset contains Netfilter fixes for *net*. Due to bug volume the plan is to make a second *net* pull request this Friday. 1) Zero nf_conntrack_expect at allocation to prevent uninitialized data leaks to userspace. Add missing exp->dir initialization. 2) Prevent out-of-bounds writes in nft_set_pipapo caused by inconsistent clones during allocation failures. Fail operations if the clone enters an error state. This was a day-0 bug. 3) Fix use-after-free race between ipset dump and array resizing. Protect array pointer access with rcu_read_lock(). From Xiang Mei. Bug existed since v4.20. 4) Validate skb_dst() exists before access in nf_conntrack_sip. This Prevent crash when called from tc ingress or openvswitch. From Pablo Neira Ayuso. Bug added in 4.3 when ovs gained support for conntrack helpers. 5) Cap the maximum number of expectations to NF_CT_EXPECT_MAX_CNT during userspace helper policy updates. Also from Pablo. 6) Prevent NULL pointer dereference in nft_fib on netdev egress hooks. Add nft_fib_netdev_validate() to restrict fib expressions to appropriate netdev hooks. Restrict nft_fib_validate() to IPv4, IPv6, and INET protocols. From Theodor Arsenij Larionov-Trichkine. Bug was exposed in v5.16 when egress hooks got added. 7) Restrict nfnetlink_queue writes to network headers. Validate IP/IPv6 header length and disable extension headers or IP option modifications. Disable bridge modification for now, its unlikely anyone is using this. 8) Restrict arbitrary writes to link-layer and network headers in nftables. Prevent link-layer modifications from spilling into network headers. Prevent writes to IP version and length fields. 9) Restrict L3 checksum update offset to IPv4. Else csum offset can be used to munge arbitrary header offsets, rendering the previous change moot. These three patches are follow-ups to a 7.1 change that disabled header rewrite ability in unprivileged network namespaces. unprivileged netns support is not yet enabled again here. netfilter pull request nf-26-06-30 * tag 'nf-26-06-30' of https://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf: netfilter: nftables: restrict checkum update offset netfilter: nftables: restrict linklayer and network header writes netfilter: nfnetlink_queue: restrict writes to network header netfilter: nft_fib: reject fib expression on the netdev egress hook netfilter: nfnetlink_cthelper: cap to maximum number of expectation per master netfilter: nf_conntrack_sip: validate skb_dst() before accessing it netfilter: ipset: fix race between dump and ip_set_list resize netfilter: nft_set_pipapo: don't leak bad clone into future transaction netfilter: nf_conntrack_expect: zero at allocation time ==================== Link: https://patch.msgid.link/20260630045243.2657-1-fw@strlen.de Signed-off-by: Paolo Abeni <pabeni@redhat.com>
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