CVE-2026-31414

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

netfilter: nf_conntrack_expect: use expect->helper

Use expect->helper in ctnetlink and /proc to dump the helper name.

Using nfct_help() without holding a reference to the master conntrack

is unsafe.

Use exp->master->helper in ctnetlink path if userspace does not provide

an explicit helper when creating an expectation to retain the existing

behaviour. The ctnetlink expectation path holds the reference on the

master conntrack and nf_conntrack_expect lock and the nfnetlink glue

path refers to the master ct that is attached to the skb.