{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "c4f78134d45c9619339c96b4bea380b1d0699788"
            },
            {
              "fixed": "63112b4515469d00008452d9cfe3fb3bf1aa2df3"
            },
            {
              "fixed": "0696709e951be54c699664adf546d16e28974d53"
            },
            {
              "fixed": "a46340da00385be7fb16c62425ebc20006f2d5d8"
            },
            {
              "fixed": "12c2496a71f82f63617971ca9b730dffa05cf58b"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.11.0"
            },
            {
              "fixed": "6.12.93"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.35"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.12"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63995.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nethtool: cmis: validate start_cmd_payload_size from module\n\nThe CMIS firmware update code reads start_cmd_payload_size from\nthe module's FW Management Features CDB reply and uses it directly\nas the byte count for memcpy. The destination buffer is 112 bytes\n(ETHTOOL_CMIS_CDB_LPL_MAX_PL_LENGTH - 8). So a malicious\nmodule (or corrupted response) can cause a OOB write later on in\ncmis_fw_update_start_download().\n\nLet's error out. If modules that expect longer LPL writes actually\nexist we should revisit.\n\nstruct cmis_cdb_start_fw_download_pl's definition has to move,\nno change there.",
  "id": "CVE-2026-63995",
  "modified": "2026-07-22T05:29:45.895074764Z",
  "published": "2026-07-19T14:56:14.580Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0696709e951be54c699664adf546d16e28974d53"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/12c2496a71f82f63617971ca9b730dffa05cf58b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/63112b4515469d00008452d9cfe3fb3bf1aa2df3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a46340da00385be7fb16c62425ebc20006f2d5d8"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63995.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63995"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "ethtool: cmis: validate start_cmd_payload_size from module"
}