CVE-2026-97998 netfilter: nfnetlink_log: cope with concurrent instance destruction

In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlinklog: cope with concurrent instance destruction Instances are refcounted. However, only memory release happens on the 1 - 0 transition; the unlink from hashes can occur with any refcount. Uncooperative userspac...