Threats Tagged 'cve-2025-40337'

A vulnerability in the Linux kernel's stmmac network driver caused it to incorrectly handle Rx checksum offload errors. The affected function, stmmac_rx, would mark packets as having valid checksums even when hardware reported checksum errors, potentially allowing corrupt packets to be processed by the network stack. This flaw has been corrected by ensuring the kernel checks the hardware status flag indicating checksum errors and forces software validation of such packets.

In the Linux kernel, the following vulnerability has been resolved: net: stmmac: Correctly handle Rx checksum offload errors The stmmac_rx function would previously set skb->ip_summed to CHECKSUM_UNNECESSARY if hardware checksum offload (CoE) was enabled and the packet was of a known IP ethertype. However, this logic failed to check if the hardware had actually reported a checksum error. The hardware status, indicating a header or payload checksum failure, was being ignored at this stage. This could cause corrupt packets to be passed up the network stack as valid. This patch corrects the logic by checking the `csum_none` status flag, which is set when the hardware reports a checksum error. If this flag is set, skb->ip_summed is now correctly set to CHECKSUM_NONE, ensuring the kernel's network stack will perform its own validation and properly handle the corrupt packet.