In the Linux kernel, the following vulnerability has been resolved:

netfilter: bridge: make ebt_snat ARP rewrite writable

The ebtables SNAT target keeps the Ethernet source address rewrite
behind skb_ensure_writable(skb, 0).  This is intentional: at the bridge
ebtables hooks the Ethernet header is addressed through
skb_mac_header()/eth_hdr(), while skb->data points at the Ethernet
payload.  Asking skb_ensure_writable() for ETH_HLEN bytes would check
the payload, not the Ethernet header, and would reintroduce the small
packet regression fixed by commit 63137bc5882a.

However, the optional ARP sender hardware address rewrite is different.
It writes through skb_store_bits() at an offset relative to skb->data:

        skb_store_bits(skb, sizeof(struct arphdr), info->mac, ETH_ALEN)

skb_header_pointer() only safely reads the ARP header; it does not make
the later sender hardware address range writable.  If that range is
still held in a nonlinear skb fragment backed by a splice-imported file
page, skb_store_bits() maps the frag page and copies the new MAC address
directly into it.

Ensure the ARP SHA range is writable before reading the ARP header and
before calling skb_store_bits().

https://git.kernel.org/stable/c/153ea96c806aea395daba907a4f88480b6ad5093

https://git.kernel.org/stable/c/67ba971ae02514d85818fe0c32549ab4bfa3bf49

https://git.kernel.org/stable/c/76280b78cc9f23bdc6438e10ad6dff148ef8375b

https://git.kernel.org/stable/c/afd64b59c3de9bbbdd3759e834fdc55cda716e0b

https://git.kernel.org/stable/c/b18675263db1147c8e1cab625400c13a0d87bd2d

https://git.kernel.org/stable/c/b7e91939ba9be805a62a257fa4e227dffbb88fa0

https://git.kernel.org/stable/c/bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87

https://git.kernel.org/stable/c/c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5

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