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CVE-2026-45844 is a Linux kernel netfilter arp_tables flaw affecting ARP payload handling on ARPHRD_IEEE1394 (FireWire) interfaces. In arp_packet_match(), the code unconditionally parses ARP payloads as if both source and target hardware addresses are present. For IPv4-over-IEEE1394 ARP, however, the target hardware address field is omitted per RFC 2734, and arp_hdr_len() already reflects this shorter layout. Because arp_packet_match() advances past a nonexistent target hardware address, it reads incorrect bytes when evaluating target hardware address and target IP address fields. This causes arptables rule evaluation to operate on garbage data and produce incorrect filtering decisions. Related unsafe assumptions also existed in arpt_mangle, where standard-layout pointer arithmetic could calculate the wrong offset for target fields on IEEE1394 ARP packets, potentially corrupting packets during mangling. The fix aligns arp_tables handling with the existing ARP stack behavior by treating IEEE1394 ARP specially, returning no match for unsupported target hardware address matches and dropping unsupported mangling cases.
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