CVE-2026-45840 openvswitch: cap upcall PID array size and pre-size vport replies

In the Linux kernel, the following vulnerability has been resolved: openvswitch: cap upcall PID array size and pre-size vport replies The vport netlink reply helpers allocate a fixed-size skb with nlmsgnewNLMSGDEFAULTSIZE, ... but serialize the full upcall PID array via ovsvportgetupcallportids...