CVE-2026-31427 netfilter: nf_conntrack_sip: fix use of uninitialized rtp_addr in process_sdp

In the Linux kernel, the following vulnerability has been resolved: netfilter: nfconntracksip: fix use of uninitialized rtpaddr in processsdp processsdp declares union nfinetaddr rtpaddr on the stack and passes it to the nfnatsip sdpsession hook after walking the SDP media descriptions. However...