CVE-2026-89556

In the Linux kernel, the following vulnerability has been resolved:

module: validate string table section types

In elf validity cache sechdrs, section sizes and offsets are validated, unless the section type is SHT NULL or SHT NOBITS.

Later, elf validity cache secstrings and elf validity cache index str access the section name table (.shstrtab) and symbol string table (.strtab) headers without first ensuring that their types are SHT STRTAB. If a section type is SHT NULL or SHT NOBITS, sh offset has not been validated and may reference out-of-bounds memory when dereferenced in elf validity cache secstrings or elf validity cache strtab.

Validate that both string section headers are of type SHT STRTAB before caching them.