{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "4dc315e267fe4a3c863fec21f26aa0a418c3f07a"
            },
            {
              "fixed": "af07fffbd53ddc3ec3c2a4ca914f27899fa89bca"
            },
            {
              "fixed": "3150e6d3223dfc356308125cabf9c34169842d2a"
            },
            {
              "fixed": "8da95cb6ad7d656c871e776a9c7b77e894d6d89c"
            },
            {
              "fixed": "1a827b95e62b4cbe851ae7cc9c961cdfa769cca4"
            },
            {
              "fixed": "c1819c8defa235c7beda859bc185b1c429a55ecd"
            },
            {
              "fixed": "285b0842f2e01c3edf805f1fd64da11d9b7f6b4c"
            },
            {
              "fixed": "87172cc8dc49aaf54407a31edffb0232f8cb93ab"
            },
            {
              "fixed": "3a5f3f7aff18bcc36a57839cf50cf0cc8de707f3"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.0"
            },
            {
              "fixed": "5.10.259"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.210"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.176"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.143"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.94"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.36"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.13"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63870.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nieee802154: 6lowpan: only accept IPv6 packets in lowpan_xmit()\n\nThe aoe driver (or similar) generates a non-IPv6 packet\n(e.g., ETH_P_AOE) and queues it for transmission via dev_queue_xmit()\non a 6LoWPAN interface (configured by the user or test case).\n\nSince the packet is not IPv6, the 6LoWPAN header_ops-\u003ecreate function\n(lowpan_header_create or header_create) returns early without initializing\nthe lowpan_addr_info structure in the skb headroom.\n\nIn the transmit function (lowpan_xmit), the driver calls lowpan_header\n(or setup_header) which unconditionally copies and uses the lowpan_addr_info\nfrom the headroom, which contains uninitialized data.\n\nFix this by dropping non IPv6 packets.\n\nA similar fix is needed in net/bluetooth/6lowpan.c bt_xmit().",
  "id": "CVE-2026-63870",
  "modified": "2026-08-12T03:51:37.888815147Z",
  "published": "2026-07-19T14:18:39.113Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1a827b95e62b4cbe851ae7cc9c961cdfa769cca4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/285b0842f2e01c3edf805f1fd64da11d9b7f6b4c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3150e6d3223dfc356308125cabf9c34169842d2a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3a5f3f7aff18bcc36a57839cf50cf0cc8de707f3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/87172cc8dc49aaf54407a31edffb0232f8cb93ab"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8da95cb6ad7d656c871e776a9c7b77e894d6d89c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/af07fffbd53ddc3ec3c2a4ca914f27899fa89bca"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c1819c8defa235c7beda859bc185b1c429a55ecd"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63870.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63870"
    },
    {
      "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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "ieee802154: 6lowpan: only accept IPv6 packets in lowpan_xmit()"
}