{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-40282",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-40282"
  ],
  "published": "2025-12-06T21:53:16Z",
  "summary": "Bluetooth: 6lowpan: reset link-local header on ipv6 recv path",
  "details": "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<IRQ>\n...\npacket_rcv (net/packet/af_packet.c:2152)\n...\n<TASK>\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------",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-40282"
    },
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    "upstream_modified": "2026-08-05T12:19:11Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.8,
      "cvss_v3_severity": "High",
      "scenario": "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 \u2014 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 \u2014 no hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - skb_mac_header() resolves to skb->head + 0xFFFF, giving unbounded out-of-bounds reads \u2014 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 \u2014 an immediate, remotely repeatable kernel panic."
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}