CVE-2025-37939 is a medium severity vulnerability in the Linux kernel's libbpf component. It involves improper access to the BTF.ext core_relo header, which could lead to a buffer read overflow. The issue was identified and fixed by updating the btf_ext_parse_info() function to verify the presence of the core_relo header before accessing its fields. This vulnerability was reported by the OSS Fuzz project.