{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-63870",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-63870"
  ],
  "published": "2026-07-19T14:17:28Z",
  "summary": "ieee802154: 6lowpan: only accept IPv6 packets in lowpan_xmit()",
  "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->create 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().",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3a5f3f7aff18bcc36a57839cf50cf0cc8de707f3"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The flaw is in the transmit path (`lowpan_xmit`) reached only when locally queued skbs are sent via `dev_queue_xmit()` (syzbot: AoE \u2192 `aoenet.c:tx` \u2192 `lowpan_xmit`), not from remote 802.15.4 packet reception.\nAC:L - An attacker who can create a 6LoWPAN interface and queue non-IPv6 packets (or misconfigure AoE onto it) reliably triggers the uninitialized read; syzbot reproduced it deterministically with no race or rare layout dependency.\nPR:L - Exploitation requires creating a `lowpan` RTNL link (`CAP_NET_ADMIN`, obtainable in a user namespace) and transmitting non-IPv6 frames via `AF_PACKET` or a misbound driver; no real-root-only capability is strictly required on typical userns-enabled systems.\nUI:N - No victim interaction is needed beyond the attacker (or fuzzer) configuring the interface and injecting the malformed transmit; exploitation is fully attacker-driven.\nS:U - Impact is confined to kernel memory handling and 802.15.4 transmission on the same host; it does not cross a VM, container, or IOMMU security boundary.\nC:H - `lowpan_header()` copies uninitialized slab contents from skb headroom (`KMSAN: uninit-value` at `tx.c:231/240`) and uses them in 802.15.4 address fields, leaking kernel heap bytes that may be encoded into transmitted WPAN frames.\nI:H - Uninitialized `ieee802154_addr` values drive `wpan_dev_hard_header()` and frame transmission, allowing heap-spray-influenced 802.15.4 destinations and corrupted over-the-air frames rather than only a benign drop.\nA:H - Successful transmission of malformed WPAN frames with attacker-influenced addressing can disrupt 802.15.4 mesh/IoT availability, and memory-safety bugs on the xmit path can escalate to kernel faults under heap-controlled conditions."
    }
  }
}