Linux

How out-of-bounds array access happens in C kernel modules and how to fix it

A high-severity out-of-bounds array access vulnerability was discovered in the natflow_conntrack.c kernel module where the `ct->proto.tcp.state` value was used directly as an array index without bounds validation. An attacker capable of manipulating TCP connection state could trigger reads beyond the `tcp_conntrack_names[]` array, potentially leaking kernel memory or causing system crashes. The fix adds a simple bounds check using `ARRAY_SIZE()` before array access.