{"id":"CVE-2025-40337","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: stmmac: Correctly handle Rx checksum offload errors\n\nThe stmmac_rx function would previously set skb->ip_summed to\nCHECKSUM_UNNECESSARY if hardware checksum offloa…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: stmmac: Correctly handle Rx checksum offload errors\n\nThe stmmac_rx function would previously set skb->ip_summed to\nCHECKSUM_UNNECESSARY if hardware checksum offloa…","severity":"high","cvss":8.2,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L","published":"2025-12-09","updated":"2026-10-14","sourceUpdated":"2026-10-14T22:10:00.210","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-40337","references":[{"url":"https://git.kernel.org/stable/c/1aa319e0f12d2d761a31556b82a5852c98eb0bea","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/63fbe0e6413279d5ea5842e2423e351ded547683","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/719fcdf29051f7471d5d433475af76219019d33d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ee0aace5f844ef59335148875d05bec8764e71e8","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd"],"epss":0.00481,"epssPercentile":0.3993,"ingestedAt":"2026-10-14T23:00:02.032Z","slug":"CVE-2025-40337","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet: stmmac: Correctly handle Rx checksum offload errors\n\nThe stmmac_rx function would previously set skb->ip_summed to\nCHECKSUM_UNNECESSARY if hardware checksum offload (CoE) was enabled\nand the packet was of a known IP ethertype.\n\nHowever, this logic failed to check if the hardware had actually\nreported a checksum error. The hardware status, indicating a header or\npayload checksum failure, was being ignored at this stage. This could\ncause corrupt packets to be passed up the network stack as valid.\n\nThis patch corrects the logic by checking the `csum_none` status flag,\nwhich is set when the hardware reports a checksum error. If this flag\nis set, skb->ip_summed is now correctly set to CHECKSUM_NONE,\nensuring the kernel's network stack will perform its own validation and\nproperly handle the corrupt packet.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":45.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}