CVE-2026-31415 ipv6: avoid overflows in ip6_datagram_send_ctl()

In the Linux kernel, the following vulnerability has been resolved: ipv6: avoid overflows in ip6datagramsendctl Yiming Qian reported : I believe I found a locally triggerable kernel bug in the IPv6 sendmsg ancillary-data path that can panic the kernel via skbunderpanic local DoS. The core issue i...