CVE-2026-89556

/// Technical description

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.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References