{"cve":"CVE-2025-40337","nvd":{"published":"2025-12-09T16:17:43.923","modified":"2026-10-14T22:10:00.210","status":"Deferred","description":"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 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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L","score":8.2},"cwes":[],"references":["https://git.kernel.org/stable/c/1aa319e0f12d2d761a31556b82a5852c98eb0bea","https://git.kernel.org/stable/c/63fbe0e6413279d5ea5842e2423e351ded547683","https://git.kernel.org/stable/c/719fcdf29051f7471d5d433475af76219019d33d","https://git.kernel.org/stable/c/ee0aace5f844ef59335148875d05bec8764e71e8"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:16:40.427100871+00:00"},"epss":{"cve":"CVE-2025-40337","score":0.00481,"percentile":0.41185,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}