CVE-2026-64354

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux797d73ee232dd1833dec4824bc53a22032e97c1c < c5ff816d5f13900c3f1f3298cfcc61339e056e56affected
LinuxLinux797d73ee232dd1833dec4824bc53a22032e97c1c < cd407de2ef5dc70f1970b343ffaa16186340fdfdaffected
LinuxLinux797d73ee232dd1833dec4824bc53a22032e97c1c < ff77d013b737c0f77d925e2f2c59f0cf3d76bd35affected
LinuxLinux797d73ee232dd1833dec4824bc53a22032e97c1c < b9452b594fd3aecbfd4aa0a6a1f741330a37dab7affected
LinuxLinux6f957d972feee9b385ea3ae6530310a84e55ba71affected
LinuxLinux6.11.6 < 6.12affected
LinuxLinux6.12affected
LinuxLinux0 < 6.12unaffected
LinuxLinux6.12.96 <= 6.12.*unaffected
LinuxLinux6.18.39 <= 6.18.*unaffected
LinuxLinux7.1.4 <= 7.1.*unaffected
LinuxLinux7.2-rc1 <= *unaffected

Weaknesses

References