CVE-2026-98371 xfrm: iptfs: fix runt reassembly panic from short inner tot_len

In the Linux kernel, the following vulnerability has been resolved: xfrm: iptfs: fix runt reassembly panic from short inner totlen When the start of an inner packet is split across two outer packets such that fewer than 4 bytes land at the end of the first one, inputprocesspayload saves those byt...