CVE-2026-98813 bpf: Hold map BTF for the memory allocator destructor record

In the Linux kernel, the following vulnerability has been resolved: bpf: Hold map BTF for the memory allocator destructor record bpfmasetdtor duplicates map-record so that the bpfmemalloc destructor can release the special fields of hash and rhash map elements once the allocator frees them for...