CyberRota Analysis
AI-GeneratedA vulnerability in the Linux kernel allows for a malformed BPF Type Format (BTF) to bypass capacity checks, potentially leading to a buffer overflow during the expansion of repeatable fields. This flaw can result in memory corruption, which may be exploited to execute arbitrary code or cause a denial of service. Organizations using Linux systems, particularly those leveraging BPF functionality, should prioritize patching this vulnerability to mitigate the associated risks.
Original NVD Description
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.