{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc"
            },
            {
              "fixed": "667b6e52048eaf4dbcf1707ed87ffd44abb9cb38"
            },
            {
              "fixed": "28cb5d8d13b4c1faf3f688f62e5df82fe7b438d8"
            },
            {
              "fixed": "4fdb0f162ccdbe9626863b10003855703253fa29"
            },
            {
              "fixed": "b28596baf87e25a078789f1c05817c8a3bf71257"
            },
            {
              "fixed": "34a71f5361fc3adb5b7138da78750b0d535a8252"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.2.0"
            },
            {
              "fixed": "6.6.148"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.101"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.42"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68299.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvmxnet3: fix BUG_ON in vmxnet3_get_hdr_len() for Geneve packets\n\nvmxnet3_get_hdr_len() assumes gdesc-\u003ercd.v4/v6/tcp always describe the\nouter header, but for a Geneve-encapsulated packet the device can set\nthem based on the inner header instead, signalled by the\nVMXNET3_RCD_HDR_INNER_SHIFT bit in the completion descriptor. Since the\nfunction never skips the outer encapsulation, this mismatch triggers:\n\n- BUG_ON(hdr.ipv4-\u003eprotocol != IPPROTO_TCP), because the outer\n  protocol is UDP (Geneve), not TCP.\n- BUG_ON(hdr.eth-\u003eh_proto != ...), when the tunnel's outer and inner\n  IP versions differ (e.g. outer IPv6/inner IPv4 or vice versa).\n\nCheck VMXNET3_RCD_HDR_INNER_SHIFT up front and bail out, since the\nfunction cannot locate the inner header it would need to parse. Also\nconvert the remaining BUG_ON()s in this function to return 0\ndefensively.",
  "id": "CVE-2026-68299",
  "modified": "2026-08-15T11:31:13.659524097Z",
  "published": "2026-08-10T12:02:33.213Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/28cb5d8d13b4c1faf3f688f62e5df82fe7b438d8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/34a71f5361fc3adb5b7138da78750b0d535a8252"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4fdb0f162ccdbe9626863b10003855703253fa29"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/667b6e52048eaf4dbcf1707ed87ffd44abb9cb38"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b28596baf87e25a078789f1c05817c8a3bf71257"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68299.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68299"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "vmxnet3: fix BUG_ON in vmxnet3_get_hdr_len() for Geneve packets"
}