CVE-2026-74737
CriticalCVSS 9.8Summary
In the Linux kernel, the am65-cpsw-nuss driver has a bug in extracting the port ID from the source tag. It uses the full 16 bits, while only the lower 8 bits represent the port ID, which can lead to out-of-bounds memory access and system crash.
Risk Assessment
The vulnerability could be exploited to cause a system crash or potentially escalate privileges, threatening system security.
Recommendation
Apply the kernel patch that uses only the lower 8 bits of the source tag as the port ID, and update the driver.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: net: ethernet: ti: am65-cpsw-nuss: Fix port_id extraction from SRC TAG On the packet reception path, the ID of the MAC Port on which the packet was received, is embedded in the RX DMA Descriptor's metadata. The ID is extracted using the helper function cppi5_desc_get_tags_ids() which fills in the 16-bit Source Tag into the 'port_id' variable. However, it is only the lower 8-bits of the 16-bit Source Tag that represent the MAC Port ID, while the upper 8-bits are Hardware-Reserved and carry an arbitrary value. With the existing logic, sporadic kernel crash is observed due to the subsequent driver code accessing out-of-bound memory because of an invalid port_id. Hence, fix the port_id extraction logic to use only the lower 8-bits of the Source Tag as the MAC Port ID.