This counts SCTP packets received from peers that failed checksum validation and were therefore discarded, distinct from cSctpStatOutOfBlues which is about correctly-checksummed packets that just couldn't be matched to an association. A nonzero and growing value here points to data corruption somewhere on the physical path to this device - a failing NIC, a flaky cable, or a misbehaving middlebox mangling packets - since checksum failures happen well below the SCTP association layer. If this counter rises specifically on one physical interface while others stay clean, that isolates the corruption to that link rather than to the SCTP stack itself.