CVE-2026-64354
HIGH
7,8
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Attack Vector: local
Attack Complexity: low
Privileges Required: low
User Interaction: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Description
AI Translation Available
In the Linux kernel, the following vulnerability has been resolved:
bpf: Validate BTF repeated field counts before expansion
btf_parse_struct_metas() walks user-supplied BTF during BPF_BTF_LOAD,
and btf_repeat_fields() expands repeatable fields from array elements
into the fixed BTF_FIELDS_MAX scratch array used by btf_parse_fields().
The remaining-capacity check performs the expanded field count calculation
in u32. A malformed BTF can wrap that calculation, causing the check to
pass even when the expanded field count exceeds the scratch array
capacity. The following memcpy() can then write past the end of the
array.
Use checked addition and multiplication before copying repeated fields
and reject impossible counts.
https://git.kernel.org/stable/c/b9452b594fd3aecbfd4aa0a6a1f741330a37dab7
https://git.kernel.org/stable/c/c5ff816d5f13900c3f1f3298cfcc61339e056e56
https://git.kernel.org/stable/c/cd407de2ef5dc70f1970b343ffaa16186340fdfd
https://git.kernel.org/stable/c/ff77d013b737c0f77d925e2f2c59f0cf3d76bd35