CVE-2026-31471

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

xfrm: iptfs: only publish mode_data after clone setup

iptfsclonestate() stores x->modedata before allocating the reorder window. If that allocation fails, the code frees the cloned state and returns -ENOMEM, leaving x->modedata pointing at freed memory.

The xfrm clone unwind later runs destroystate() through x->modedata, so the failed clone path tears down IPTFS state that clone_state() already freed.

Keep the cloned IPTFS state private until all allocations succeed so failed clones leave x->modedata unset. The destroy path already handles a NULL modedata pointer.