CVE-2026-80875

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

ipvs: use parsed transport offset in TCP state lookup

TCP state handling reparses the skb to find the TCP header. For IPv6 it

uses sizeof(struct ipv6hdr), while the surrounding IPVS code already

parsed the packet with ip_vs_fill_iph_skb() and has the real

transport-header offset in iph.len.

This makes TCP state handling look at the wrong bytes when an IPv6

packet carries extension headers. Use the parsed transport offset passed

down from ip_vs_set_state() when reading the TCP header.

For IPv4 and for IPv6 packets without extension headers, the passed

offset matches the previous value.