{"api_version":"1","generated_at":"2026-07-24T20:19:13+00:00","cve":"CVE-2026-63870","urls":{"html":"https://cve.report/CVE-2026-63870","api":"https://cve.report/api/cve/CVE-2026-63870.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-63870","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-63870"},"summary":{"title":"ieee802154: 6lowpan: only accept IPv6 packets in lowpan_xmit()","description":"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().","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 15:16:53","updated_at":"2026-07-20 15:16:52"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/1a827b95e62b4cbe851ae7cc9c961cdfa769cca4","name":"https://git.kernel.org/stable/c/1a827b95e62b4cbe851ae7cc9c961cdfa769cca4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c1819c8defa235c7beda859bc185b1c429a55ecd","name":"https://git.kernel.org/stable/c/c1819c8defa235c7beda859bc185b1c429a55ecd","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3a5f3f7aff18bcc36a57839cf50cf0cc8de707f3","name":"https://git.kernel.org/stable/c/3a5f3f7aff18bcc36a57839cf50cf0cc8de707f3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3150e6d3223dfc356308125cabf9c34169842d2a","name":"https://git.kernel.org/stable/c/3150e6d3223dfc356308125cabf9c34169842d2a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/87172cc8dc49aaf54407a31edffb0232f8cb93ab","name":"https://git.kernel.org/stable/c/87172cc8dc49aaf54407a31edffb0232f8cb93ab","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/af07fffbd53ddc3ec3c2a4ca914f27899fa89bca","name":"https://git.kernel.org/stable/c/af07fffbd53ddc3ec3c2a4ca914f27899fa89bca","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/285b0842f2e01c3edf805f1fd64da11d9b7f6b4c","name":"https://git.kernel.org/stable/c/285b0842f2e01c3edf805f1fd64da11d9b7f6b4c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8da95cb6ad7d656c871e776a9c7b77e894d6d89c","name":"https://git.kernel.org/stable/c/8da95cb6ad7d656c871e776a9c7b77e894d6d89c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-63870","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63870","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4dc315e267fe4a3c863fec21f26aa0a418c3f07a af07fffbd53ddc3ec3c2a4ca914f27899fa89bca git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4dc315e267fe4a3c863fec21f26aa0a418c3f07a 3150e6d3223dfc356308125cabf9c34169842d2a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4dc315e267fe4a3c863fec21f26aa0a418c3f07a 8da95cb6ad7d656c871e776a9c7b77e894d6d89c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4dc315e267fe4a3c863fec21f26aa0a418c3f07a 1a827b95e62b4cbe851ae7cc9c961cdfa769cca4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.210 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.176 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.143 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.94 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.36 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.13 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"63870","cve":"CVE-2026-63870","epss":"0.001680000","percentile":"0.064990000","score_date":"2026-07-20","updated_at":"2026-07-21 00:13:14"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"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"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.259","versionStartIncluding":"4.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.210","versionStartIncluding":"4.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.176","versionStartIncluding":"4.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.143","versionStartIncluding":"4.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.94","versionStartIncluding":"4.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.36","versionStartIncluding":"4.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.13","versionStartIncluding":"4.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"4.0","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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->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()."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-07-20T13:41:03.365Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}],"title":"ieee802154: 6lowpan: only accept IPv6 packets in lowpan_xmit()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-63870","datePublished":"2026-07-19T14:18:39.113Z","dateReserved":"2026-07-19T07:54:57.017Z","dateUpdated":"2026-07-20T13:41:03.365Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-19 15:16:53","lastModifiedDate":"2026-07-20 15:16:52","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"63870","Ordinal":"1","Title":"ieee802154: 6lowpan: only accept IPv6 packets in lowpan_xmit()","CVE":"CVE-2026-63870","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"63870","Ordinal":"1","NoteData":"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().","Type":"Description","Title":"ieee802154: 6lowpan: only accept IPv6 packets in lowpan_xmit()"}]}}}