CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's GARP attribute parser, where an unsigned integer underflow occurs due to incorrect computation of the data length, leading to potential truncation of the parsed data. This can result in the failure to process Join/Leave events for critical attributes like GVRP VLAN registration, disrupting network operations. Network administrators and organizations relying on Linux-based systems for network management should prioritize this issue to ensure reliable GARP functionality.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: net: garp: fix unsigned integer underflow in garp_pdu_parse_attr The receive-side GARP attribute parser computes dlen with reversed operands: dlen = sizeof(*ga) - ga->len; ga->len is the on-wire attribute length and includes the GARP attribute header. For normal attributes with data, ga->len is larger than sizeof(*ga), so the subtraction underflows in unsigned arithmetic. The resulting value is later passed to garp_attr_lookup(), whose length argument is u8. After truncation, the parsed data length usually no longer matches the length stored for locally registered attributes, so received Join/Leave events are ignored. This breaks the GARP receive path for common attributes, such as GVRP VLAN registration attributes. Compute the data length as the attribute length minus the header length.