{"id":"CVE-2026-23447","title":"net: usb: cdc_ncm: add ndpoffset to NDP32 nframes bounds check","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: usb: cdc_ncm: add ndpoffset to NDP32 nframes bounds check\n\nThe same bounds-check bug fixed for NDP16 in the previous patch also\nexists in cdc_ncm_rx_verify_ndp32()…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 0fa81b304a7973a499f844176ca031109487dd31 < baf246d6680befde2086b1df9eb3aaba3fb6853f","Linux >= 0fa81b304a7973a499f844176ca031109487dd31 < 125f932a76a97904ef8a555f1dd53e5d0e288c54","Linux >= 0fa81b304a7973a499f844176ca031109487dd31 < af0d1613d6751489dbf9f69aac1123f0b1e566e5","Linux >= 0fa81b304a7973a499f844176ca031109487dd31 < a5bd5a2710310c965ea4153cba4210988a3454e2","Linux >= 0fa81b304a7973a499f844176ca031109487dd31 < de70da1fb1d152e981ecb3157f7ec2b633005c16","Linux >= 0fa81b304a7973a499f844176ca031109487dd31 < 77914255155e68a20aa41175edeecf8121dac391","Linux 8cf7db86a8984ffa3a3388a8df12bc0aa4c79bd7","Linux 4ca8b8855264cf1439cdab3da7049bd1e3c2a9e6","Linux a270ca35a9499b58366d696d3290eaa4697a42db","Linux >= 4.14.317 < 4.15","Linux >= 4.19.285 < 4.20","Linux >= 5.4.245 < 5.5","Linux 5.7"],"published":"2026-04-03","updated":"2026-09-14","sourceUpdated":"2026-09-14T11:58:13.940Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-23447","references":[{"url":"https://git.kernel.org/stable/c/baf246d6680befde2086b1df9eb3aaba3fb6853f"},{"url":"https://git.kernel.org/stable/c/125f932a76a97904ef8a555f1dd53e5d0e288c54"},{"url":"https://git.kernel.org/stable/c/af0d1613d6751489dbf9f69aac1123f0b1e566e5"},{"url":"https://git.kernel.org/stable/c/a5bd5a2710310c965ea4153cba4210988a3454e2"},{"url":"https://git.kernel.org/stable/c/de70da1fb1d152e981ecb3157f7ec2b633005c16"},{"url":"https://git.kernel.org/stable/c/77914255155e68a20aa41175edeecf8121dac391"}],"tags":["cve.org"],"epss":0.00129,"epssPercentile":0.02947,"ingestedAt":"2026-09-14T15:23:07.459Z","slug":"CVE-2026-23447","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet: usb: cdc_ncm: add ndpoffset to NDP32 nframes bounds check\n\nThe same bounds-check bug fixed for NDP16 in the previous patch also\nexists in cdc_ncm_rx_verify_ndp32(). The DPE array size is validated\nagainst the total skb length without accounting for ndpoffset, allowing\nout-of-bounds reads when the NDP32 is placed near the end of the NTB.\n\nAdd ndpoffset to the nframes bounds check and use struct_size_t() to\nexpress the NDP-plus-DPE-array size more clearly.\n\nCompile-tested only.\n\n## Affected\n\n- `Linux >= 0fa81b304a7973a499f844176ca031109487dd31 < baf246d6680befde2086b1df9eb3aaba3fb6853f`\n- `Linux >= 0fa81b304a7973a499f844176ca031109487dd31 < 125f932a76a97904ef8a555f1dd53e5d0e288c54`\n- `Linux >= 0fa81b304a7973a499f844176ca031109487dd31 < af0d1613d6751489dbf9f69aac1123f0b1e566e5`\n- `Linux >= 0fa81b304a7973a499f844176ca031109487dd31 < a5bd5a2710310c965ea4153cba4210988a3454e2`\n- `Linux >= 0fa81b304a7973a499f844176ca031109487dd31 < de70da1fb1d152e981ecb3157f7ec2b633005c16`\n- `Linux >= 0fa81b304a7973a499f844176ca031109487dd31 < 77914255155e68a20aa41175edeecf8121dac391`\n- `Linux 8cf7db86a8984ffa3a3388a8df12bc0aa4c79bd7`\n- `Linux 4ca8b8855264cf1439cdab3da7049bd1e3c2a9e6`\n- `Linux a270ca35a9499b58366d696d3290eaa4697a42db`\n- `Linux >= 4.14.317 < 4.15`\n- `Linux >= 4.19.285 < 4.20`\n- `Linux >= 5.4.245 < 5.5`\n- `Linux 5.7`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}