Bluetooth: hci_devcd_dump: fix out-of-bounds via dev_coredumpv

{
  "id": "e575754c2e4d46a928b9da8122537e1f9b646c0157f540835c6020668c3f3be1",
  "url": "https://osv.dev/vulnerability/CVE-2025-38592",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Bluetooth: hci_devcd_dump: fix out-of-bounds via dev_coredumpv",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_devcd_dump: fix out-of-bounds via dev_coredumpv Currently both dev_coredumpv and skb_put_data in hci_devcd_dump use hdev->dump.head. However, dev_coredumpv can free the buffer. From dev_coredumpm_timeout documentation, which is used by dev_coredumpv: > Creates a new device coredump for the given device. If a previous one hasn't > been read yet, the new coredump is discarded. The data lifetime is determined > by the device coredump framework and when it is no longer needed the @free > function will be called to free the data. If the data has not been read by the userspace yet, dev_coredumpv will discard new buffer, freeing hdev->dump.head. This leads to vmalloc-out-of-bounds error when skb_put_data tries to access hdev->dump.head. A crash report from syzbot illustrates this: ================================================================== BUG: KASAN: vmalloc-out-of-bounds in skb_put_data include/linux/skbuff.h:2752 [inline] BUG: KASAN: vmalloc-out-of-bounds in hci_devcd_dump+0x142/0x240 net/bluetooth/coredump.c:258 Read of size 140 at addr ffffc90004ed5000 by task kworker/u9:2/5844 CPU: 1 UID: 0 PID: 5844 Comm: kworker/u9:2 Not tainted 6.14.0-syzkaller-10892-g4e82c87058f4 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Workqueue: hci0 hci_devcd_timeout Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib",
    "evidence": "osv:CVE-2025-38592",
    "products": [
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        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "6.15.10",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.16.1",
            "evidence": "/affected/1/ranges"
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    "severity": "high",
    "structured": {
      "id": "CVE-2025-38592",
      "aliases": [
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      "metrics": [
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          "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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                  "fixed": "8c021ad797f9171d015cf0a932a3fbe5232190f5"
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              "type": "ECOSYSTEM",
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            "ecosystem": "Linux"
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      ],
      "modified": "2026-10-28T02:30:50.956447389Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/7af4d7b53502286c6cf946d397ab183e76d14820",
        "https://git.kernel.org/stable/c/8c021ad797f9171d015cf0a932a3fbe5232190f5",
        "https://git.kernel.org/stable/c/efd55f6a59449f8d4e4953f12c177aa902b7451f",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38592.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-38592",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38592.json"
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    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
  "document_id": 519117,
  "published_at": "2025-08-19T17:03:18.229+00:00"
}