{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-40282", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:20:57.184Z", "datePublished": "2025-12-06T21:51:06.287Z", "dateUpdated": "2026-08-05T12:09:12.019Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:09:12.019Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: 6lowpan: reset link-local header on ipv6 recv path\n\nBluetooth 6lowpan.c netdev has header_ops, so it must set link-local\nheader for RX skb, otherwise things crash, eg. with AF_PACKET SOCK_RAW\n\nAdd missing skb_reset_mac_header() for uncompressed ipv6 RX path.\n\nFor the compressed one, it is done in lowpan_header_decompress().\n\nLog: (BlueZ 6lowpan-tester Client Recv Raw - Success)\n------\nkernel BUG at net/core/skbuff.c:212!\nCall Trace:\n\n...\npacket_rcv (net/packet/af_packet.c:2152)\n...\n\n__local_bh_enable_ip (kernel/softirq.c:407)\nnetif_rx (net/core/dev.c:5648)\nchan_recv_cb (net/bluetooth/6lowpan.c:294 net/bluetooth/6lowpan.c:359)\n------" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:A - The malicious frame arrives over a Bluetooth LE L2CAP IPSP channel handled by chan_recv_cb()/recv_pkt(), so the attacker must be within BLE radio range of the target.\nAC:L - The attacker fully controls the trigger — the 6lowpan dispatch byte (0x41) selects the vulnerable uncompressed-IPv6 branch deterministically, with no race, no memory-layout dependency, and no retry needed.\nPR:N - The IPSP listening channel is created with sec_level BT_SECURITY_LOW on BDADDR_ANY, and smp_sufficient_security() short-circuits to true for that level, so an unpaired, unauthenticated peer can connect and send the frame.\nUI:N - No victim action is needed; the packet is processed in softirq context on receipt, and the ndisc/eth_hdr() consumer path is driven entirely by the attacker's own frames.\nS:U - The corruption and its consequences stay within the kernel's own security authority — no hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - skb_mac_header() resolves to skb->head + 0xFFFF, giving unbounded out-of-bounds reads — eth_hdr(skb)->h_source in ndisc_recv_na() leaks kernel heap bytes into dmesg, and the ~4 GiB skb->data underflow with inflated skb->len exposes arbitrary kernel memory in paths that do not BUG() first.\nI:H - skb_push()/__skb_push() write a wildly out-of-range skb->data and a massively inflated skb->len before any validation; in the generic-XDP path __skb_push() has no bounds check at all, so the corrupted geometry feeds pskb_expand_head()/skb_linearize() and yields out-of-bounds writes.\nA:H - The reported outcome is a hard kernel BUG() in skb_under_panic() at net/core/skbuff.c:212 taken in IRQ/softirq context, which is a fatal exception in interrupt — an immediate, remotely repeatable kernel panic." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/bluetooth/6lowpan.c" ], "versions": [ { "version": "18722c247023035b9e2e2a08a887adec2a9a6e49", "lessThan": "ea46a1d217bc82e01cf3d0424e50ebfe251e34bf", "status": "affected", "versionType": "git" }, { "version": "18722c247023035b9e2e2a08a887adec2a9a6e49", "lessThan": "973e0271754c77db3e1b6b69adf2de85a79a4c8b", "status": "affected", "versionType": "git" }, { "version": "18722c247023035b9e2e2a08a887adec2a9a6e49", "lessThan": "d566e9a2bfc848941b091ffd5f4e12c4e889d818", "status": "affected", "versionType": "git" }, { "version": "18722c247023035b9e2e2a08a887adec2a9a6e49", "lessThan": "4ebb90c3c309e6375dc3e841af92e2a039843e62", "status": "affected", "versionType": "git" }, { "version": "18722c247023035b9e2e2a08a887adec2a9a6e49", "lessThan": "c24ac6cfe4f9a47180a65592c47e7a310d2f9d93", "status": "affected", "versionType": "git" }, { "version": "18722c247023035b9e2e2a08a887adec2a9a6e49", "lessThan": "11cd7e068381666f842ad41d1cc58eecd0c75237", "status": "affected", "versionType": "git" }, { "version": "18722c247023035b9e2e2a08a887adec2a9a6e49", "lessThan": "70d84e7c3a44b81020a3c3d650a64c63593405bd", "status": "affected", "versionType": "git" }, { "version": "18722c247023035b9e2e2a08a887adec2a9a6e49", "lessThan": "3b78f50918276ab28fb22eac9aa49401ac436a3b", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/bluetooth/6lowpan.c" ], "versions": [ { "version": "3.14", "status": "affected" }, { "version": "0", "lessThan": "3.14", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.302", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.247", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.197", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.159", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.117", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.59", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.17.9", "lessThanOrEqual": "6.17.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18", "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": "3.14", "versionEndExcluding": "5.4.302" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "5.10.247" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "5.15.197" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.1.159" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.6.117" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.12.59" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.17.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.18" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/ea46a1d217bc82e01cf3d0424e50ebfe251e34bf" }, { "url": "https://git.kernel.org/stable/c/973e0271754c77db3e1b6b69adf2de85a79a4c8b" }, { "url": "https://git.kernel.org/stable/c/d566e9a2bfc848941b091ffd5f4e12c4e889d818" }, { "url": "https://git.kernel.org/stable/c/4ebb90c3c309e6375dc3e841af92e2a039843e62" }, { "url": "https://git.kernel.org/stable/c/c24ac6cfe4f9a47180a65592c47e7a310d2f9d93" }, { "url": "https://git.kernel.org/stable/c/11cd7e068381666f842ad41d1cc58eecd0c75237" }, { "url": "https://git.kernel.org/stable/c/70d84e7c3a44b81020a3c3d650a64c63593405bd" }, { "url": "https://git.kernel.org/stable/c/3b78f50918276ab28fb22eac9aa49401ac436a3b" } ], "title": "Bluetooth: 6lowpan: reset link-local header on ipv6 recv path", "x_generator": { "engine": "bippy-1.2.0" } } } }