{"id":"CVE-2026-63870","title":"ieee802154: 6lowpan: only accept IPv6 packets in lowpan_xmit()","summary":"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…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 4dc315e267fe4a3c863fec21f26aa0a418c3f07a < af07fffbd53ddc3ec3c2a4ca914f27899fa89bca","Linux >= 4dc315e267fe4a3c863fec21f26aa0a418c3f07a < 3150e6d3223dfc356308125cabf9c34169842d2a","Linux >= 4dc315e267fe4a3c863fec21f26aa0a418c3f07a < 8da95cb6ad7d656c871e776a9c7b77e894d6d89c","Linux >= 4dc315e267fe4a3c863fec21f26aa0a418c3f07a < 1a827b95e62b4cbe851ae7cc9c961cdfa769cca4","Linux >= 4dc315e267fe4a3c863fec21f26aa0a418c3f07a < c1819c8defa235c7beda859bc185b1c429a55ecd","Linux >= 4dc315e267fe4a3c863fec21f26aa0a418c3f07a < 285b0842f2e01c3edf805f1fd64da11d9b7f6b4c","Linux >= 4dc315e267fe4a3c863fec21f26aa0a418c3f07a < 87172cc8dc49aaf54407a31edffb0232f8cb93ab","Linux >= 4dc315e267fe4a3c863fec21f26aa0a418c3f07a < 3a5f3f7aff18bcc36a57839cf50cf0cc8de707f3","Linux 4.0"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:32:39.861353Z"},"published":"2026-07-19","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:42:09.174Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-63870","references":[{"url":"https://git.kernel.org/stable/c/af07fffbd53ddc3ec3c2a4ca914f27899fa89bca"},{"url":"https://git.kernel.org/stable/c/3150e6d3223dfc356308125cabf9c34169842d2a"},{"url":"https://git.kernel.org/stable/c/8da95cb6ad7d656c871e776a9c7b77e894d6d89c"},{"url":"https://git.kernel.org/stable/c/1a827b95e62b4cbe851ae7cc9c961cdfa769cca4"},{"url":"https://git.kernel.org/stable/c/c1819c8defa235c7beda859bc185b1c429a55ecd"},{"url":"https://git.kernel.org/stable/c/285b0842f2e01c3edf805f1fd64da11d9b7f6b4c"},{"url":"https://git.kernel.org/stable/c/87172cc8dc49aaf54407a31edffb0232f8cb93ab"},{"url":"https://git.kernel.org/stable/c/3a5f3f7aff18bcc36a57839cf50cf0cc8de707f3"}],"tags":["cve.org"],"epss":0.00127,"epssPercentile":0.02142,"ingestedAt":"2026-10-16T17:24:46.771Z","slug":"CVE-2026-63870","body":"## Overview\n\nIn 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().\n\n## Affected\n\n- `Linux >= 4dc315e267fe4a3c863fec21f26aa0a418c3f07a < af07fffbd53ddc3ec3c2a4ca914f27899fa89bca`\n- `Linux >= 4dc315e267fe4a3c863fec21f26aa0a418c3f07a < 3150e6d3223dfc356308125cabf9c34169842d2a`\n- `Linux >= 4dc315e267fe4a3c863fec21f26aa0a418c3f07a < 8da95cb6ad7d656c871e776a9c7b77e894d6d89c`\n- `Linux >= 4dc315e267fe4a3c863fec21f26aa0a418c3f07a < 1a827b95e62b4cbe851ae7cc9c961cdfa769cca4`\n- `Linux >= 4dc315e267fe4a3c863fec21f26aa0a418c3f07a < c1819c8defa235c7beda859bc185b1c429a55ecd`\n- `Linux >= 4dc315e267fe4a3c863fec21f26aa0a418c3f07a < 285b0842f2e01c3edf805f1fd64da11d9b7f6b4c`\n- `Linux >= 4dc315e267fe4a3c863fec21f26aa0a418c3f07a < 87172cc8dc49aaf54407a31edffb0232f8cb93ab`\n- `Linux >= 4dc315e267fe4a3c863fec21f26aa0a418c3f07a < 3a5f3f7aff18bcc36a57839cf50cf0cc8de707f3`\n- `Linux 4.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}