cvedb.io
CVE-2025-40337
HIGH · CVSS 8.2
EPSS exploitation probability: 0%
Published 2025-12-09T16:17:43.923 · Last modified 2026-07-30T06:24:30.197

Summary

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

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.