FKIE_CVE-2026-63870

Vulnerability from fkie_nvd - Published: 2026-07-19 15:16 - Updated: 2026-07-20 15:16
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ieee802154: 6lowpan: only accept IPv6 packets in lowpan_xmit() The aoe driver (or similar) generates a non-IPv6 packet (e.g., ETH_P_AOE) and queues it for transmission via dev_queue_xmit() on a 6LoWPAN interface (configured by the user or test case). Since the packet is not IPv6, the 6LoWPAN header_ops->create function (lowpan_header_create or header_create) returns early without initializing the lowpan_addr_info structure in the skb headroom. In the transmit function (lowpan_xmit), the driver calls lowpan_header (or setup_header) which unconditionally copies and uses the lowpan_addr_info from the headroom, which contains uninitialized data. Fix this by dropping non IPv6 packets. A similar fix is needed in net/bluetooth/6lowpan.c bt_xmit().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1a827b95e62b4cbe851ae7cc9c961cdfa769cca4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/285b0842f2e01c3edf805f1fd64da11d9b7f6b4c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3150e6d3223dfc356308125cabf9c34169842d2a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3a5f3f7aff18bcc36a57839cf50cf0cc8de707f3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/87172cc8dc49aaf54407a31edffb0232f8cb93ab
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8da95cb6ad7d656c871e776a9c7b77e894d6d89c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/af07fffbd53ddc3ec3c2a4ca914f27899fa89bca
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c1819c8defa235c7beda859bc185b1c429a55ecd
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ieee802154/6lowpan/tx.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "af07fffbd53ddc3ec3c2a4ca914f27899fa89bca",
              "status": "affected",
              "version": "4dc315e267fe4a3c863fec21f26aa0a418c3f07a",
              "versionType": "git"
            },
            {
              "lessThan": "3150e6d3223dfc356308125cabf9c34169842d2a",
              "status": "affected",
              "version": "4dc315e267fe4a3c863fec21f26aa0a418c3f07a",
              "versionType": "git"
            },
            {
              "lessThan": "8da95cb6ad7d656c871e776a9c7b77e894d6d89c",
              "status": "affected",
              "version": "4dc315e267fe4a3c863fec21f26aa0a418c3f07a",
              "versionType": "git"
            },
            {
              "lessThan": "1a827b95e62b4cbe851ae7cc9c961cdfa769cca4",
              "status": "affected",
              "version": "4dc315e267fe4a3c863fec21f26aa0a418c3f07a",
              "versionType": "git"
            },
            {
              "lessThan": "c1819c8defa235c7beda859bc185b1c429a55ecd",
              "status": "affected",
              "version": "4dc315e267fe4a3c863fec21f26aa0a418c3f07a",
              "versionType": "git"
            },
            {
              "lessThan": "285b0842f2e01c3edf805f1fd64da11d9b7f6b4c",
              "status": "affected",
              "version": "4dc315e267fe4a3c863fec21f26aa0a418c3f07a",
              "versionType": "git"
            },
            {
              "lessThan": "87172cc8dc49aaf54407a31edffb0232f8cb93ab",
              "status": "affected",
              "version": "4dc315e267fe4a3c863fec21f26aa0a418c3f07a",
              "versionType": "git"
            },
            {
              "lessThan": "3a5f3f7aff18bcc36a57839cf50cf0cc8de707f3",
              "status": "affected",
              "version": "4dc315e267fe4a3c863fec21f26aa0a418c3f07a",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ieee802154/6lowpan/tx.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.0"
            },
            {
              "lessThan": "4.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.259",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.210",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.176",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.94",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.36",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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",
  "lastModified": "2026-07-20T15:16:52.923",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-07-19T15:16:53.990",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1a827b95e62b4cbe851ae7cc9c961cdfa769cca4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/285b0842f2e01c3edf805f1fd64da11d9b7f6b4c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3150e6d3223dfc356308125cabf9c34169842d2a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3a5f3f7aff18bcc36a57839cf50cf0cc8de707f3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/87172cc8dc49aaf54407a31edffb0232f8cb93ab"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8da95cb6ad7d656c871e776a9c7b77e894d6d89c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/af07fffbd53ddc3ec3c2a4ca914f27899fa89bca"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c1819c8defa235c7beda859bc185b1c429a55ecd"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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