CVE-2026-93138: In the Linux kernel, the following vulnerability has been resolved: bpf: Fix vmlinux BTF prep race in bpf_get_btf_vmlin

A race condition (a timing bug where two processes access shared data simultaneously without proper coordination) was found in the Linux kernel's bpf_get_btf_vmlinux() function, where one thread could read incomplete data published by another thread because the pointer was shared without proper synchronization (memory ordering guarantees). The fix uses smp_store_release() and smp_load_acquire() (special CPU instructions that ensure data is fully written and read in the correct order on weakly ordered architectures, where CPU cores can process instructions out of order).