GHSA-PHQ6-Q8J5-J858
Vulnerability from github – Published: 2026-07-19 15:30 – Updated: 2026-07-20 15:31In 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().
{
"affected": [],
"aliases": [
"CVE-2026-63870"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-07-19T15:16:53Z",
"severity": "HIGH"
},
"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": "GHSA-phq6-q8j5-j858",
"modified": "2026-07-20T15:31:49Z",
"published": "2026-07-19T15:30:28Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63870"
},
{
"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"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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