CVE-2026-63870 (GCVE-0-2026-63870)
Vulnerability from cvelistv5
Published
2026-07-19 14:18
Modified
2026-10-19 20:17
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
Impacted products
Vendor Product Version
Linux Linux Version: 4dc315e267fe4a3c863fec21f26aa0a418c3f07a
Version: 4dc315e267fe4a3c863fec21f26aa0a418c3f07a
Version: 4dc315e267fe4a3c863fec21f26aa0a418c3f07a
Version: 4dc315e267fe4a3c863fec21f26aa0a418c3f07a
Version: 4dc315e267fe4a3c863fec21f26aa0a418c3f07a
Version: 4dc315e267fe4a3c863fec21f26aa0a418c3f07a
Version: 4dc315e267fe4a3c863fec21f26aa0a418c3f07a
Version: 4dc315e267fe4a3c863fec21f26aa0a418c3f07a
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{\"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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().\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.259\", \"versionStartIncluding\": \"4.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.210\", \"versionStartIncluding\": \"4.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.176\", \"versionStartIncluding\": \"4.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.143\", \"versionStartIncluding\": \"4.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.94\", \"versionStartIncluding\": \"4.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.36\", \"versionStartIncluding\": \"4.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0.13\", \"versionStartIncluding\": \"4.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1\", \"versionStartIncluding\": \"4.0\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:36:45.663Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-63870\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T20:17:53.580Z\", \"dateReserved\": \"2026-07-19T07:54:57.017Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-07-19T14:18:39.113Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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