Bluetooth: btintel: serialize btintel_hw_error() with hci_req_sync_lock

{
  "id": "1633e93a7c5a50ee8b7ab2cc96db0a634649fb69a9d6752cf4df37e80c352378",
  "url": "https://osv.dev/vulnerability/CVE-2026-31500",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Bluetooth: btintel: serialize btintel_hw_error() with hci_req_sync_lock",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: Bluetooth: btintel: serialize btintel_hw_error() with hci_req_sync_lock btintel_hw_error() issues two __hci_cmd_sync() calls (HCI_OP_RESET and Intel exception-info retrieval) without holding hci_req_sync_lock(). This lets it race against hci_dev_do_close() -> btintel_shutdown_combined(), which also runs __hci_cmd_sync() under the same lock. When both paths manipulate hdev->req_status/req_rsp concurrently, the close path may free the response skb first, and the still-running hw_error path hits a slab-use-after-free in kfree_skb(). Wrap the whole recovery sequence in hci_req_sync_lock/unlock so it is serialized with every other synchronous HCI command issuer. Below is the data race report and the kasan report: BUG: data-race in __hci_cmd_sync_sk / btintel_shutdown_combined read of hdev->req_rsp at net/bluetooth/hci_sync.c:199 by task kworker/u17:1/83: __hci_cmd_sync_sk+0x12f2/0x1c30 net/bluetooth/hci_sync.c:200 __hci_cmd_sync+0x55/0x80 net/bluetooth/hci_sync.c:223 btintel_hw_error+0x114/0x670 drivers/bluetooth/btintel.c:254 hci_error_reset+0x348/0xa30 net/bluetooth/hci_core.c:1030 write/free by task ioctl/22580: btintel_shutdown_combined+0xd0/0x360 drivers/bluetooth/btintel.c:3648 hci_dev_close_sync+0x9ae/0x2c10 net/bluetooth/hci_sync.c:5246 hci_dev_do_close+0x232/0x460 net/bluetooth/hci_core.c:526 BUG: KASAN: slab-use-after-free in sk_skb_reason_drop+0x43/0x380 net/core/skbuff.c:1202 Read of size 4 at addr fff",
    "evidence": "osv:CVE-2026-31500",
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    "severity": "unknown",
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      "modified": "2026-10-28T02:30:28.201624124Z",
      "provider": "osv",
      "references": [
        "https://cert-portal.siemens.com/productcert/html/ssa-784472.html",
        "https://git.kernel.org/stable/c/5f84e845648dfa86e42de5487f1a774b42f0444d",
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    "security_relevant": true,
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  "source_id": "core-osv",
  "document_id": 494567,
  "published_at": "2026-04-22T13:54:21.071+00:00"
}