CVE-2026-63870

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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": {"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"}, "scenarios": [{"lang": "en", "value": "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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ieee802154/6lowpan/tx.c"], "versions": [{"version": "4dc315e267fe4a3c863fec21f26aa0a418c3f07a", "lessThan": "af07fffbd53ddc3ec3c2a4ca914f27899fa89bca", "status": "affected", "versionType": "git"}, {"version": "4dc315e267fe4a3c863fec21f26aa0a418c3f07a", "lessThan": "3150e6d3223dfc356308125cabf9c34169842d2a", "status": "affected", "versionType": "git"}, {"version": "4dc315e267fe4a3c863fec21f26aa0a418c3f07a", "lessThan": "8da95cb6ad7d656c871e776a9c7b77e894d6d89c", "status": "affected", "versionType": "git"}, {"version": "4dc315e267fe4a3c863fec21f26aa0a418c3f07a", "lessThan": "1a827b95e62b4cbe851ae7cc9c961cdfa769cca4", "status": "affected", "versionType": "git"}, {"version": "4dc315e267fe4a3c863fec21f26aa0a418c3f07a", "lessThan": "c1819c8defa235c7beda859bc185b1c429a55ecd", "status": "affected", "versionType": "git"}, {"version": "4dc315e267fe4a3c863fec21f26aa0a418c3f07a", "lessThan": "285b0842f2e01c3edf805f1fd64da11d9b7f6b4c", "status": "affected", "versionType": "git"}, {"version": "4dc315e267fe4a3c863fec21f26aa0a418c3f07a", "lessThan": "87172cc8dc49aaf54407a31edffb0232f8cb93ab", "status": "affected", "versionType": "git"}, {"version": "4dc315e267fe4a3c863fec21f26aa0a418c3f07a", "lessThan": "3a5f3f7aff18bcc36a57839cf50cf0cc8de707f3", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": 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"lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "5.10.259"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "5.15.210"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "6.1.176"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "6.6.143"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "6.12.94"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", 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"https://git.kernel.org/stable/c/3a5f3f7aff18bcc36a57839cf50cf0cc8de707f3"}], "title": "ieee802154: 6lowpan: only accept IPv6 packets in lowpan_xmit()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-63870", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:32:39.861353Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-119", "description": "CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T20:17:53.580Z"}}]}}

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(`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."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4dc315e267fe4a3c863fec21f26aa0a418c3f07a", "lessThan": "af07fffbd53ddc3ec3c2a4ca914f27899fa89bca", 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packets.\n\nA similar fix is needed in net/bluetooth/6lowpan.c bt_xmit()."}], "id": "CVE-2026-63870", "lastModified": "2026-10-26T16:42:56.280", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-63870", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:32:39.861353Z", "version": "2.0.3"}}]}, "published": "2026-07-19T15:16:53.990", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1a827b95e62b4cbe851ae7cc9c961cdfa769cca4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/285b0842f2e01c3edf805f1fd64da11d9b7f6b4c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3150e6d3223dfc356308125cabf9c34169842d2a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3a5f3f7aff18bcc36a57839cf50cf0cc8de707f3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/87172cc8dc49aaf54407a31edffb0232f8cb93ab"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8da95cb6ad7d656c871e776a9c7b77e894d6d89c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/af07fffbd53ddc3ec3c2a4ca914f27899fa89bca"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c1819c8defa235c7beda859bc185b1c429a55ecd"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-908"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-119"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: ieee802154: 6lowpan: only accept IPv6 packets in lowpan_xmit()", "id": "2502299", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502299"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-824", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nieee802154: 6lowpan: only accept IPv6 packets in lowpan_xmit()\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).\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.\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.\nFix this by dropping non IPv6 packets.\nA similar fix is needed in net/bluetooth/6lowpan.c bt_xmit().", "A flaw was found in the Linux kernel's 6LoWPAN (IPv6 over Low-Power Wireless Personal Area Networks) module. When a non-IPv6 packet is transmitted over a 6LoWPAN interface, the system attempts to process uninitialized data. This can lead to system instability or a denial of service, making the system unresponsive."], "name": "CVE-2026-63870", "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-63870\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-63870\nhttps://lore.kernel.org/linux-cve-announce/2026071914-CVE-2026-63870-d621@gregkh/T"], "threat_severity": "Moderate"}

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