{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-31500",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-31500"
  ],
  "published": "2026-04-22T13:57:42Z",
  "summary": "Bluetooth: btintel: serialize btintel_hw_error() with hci_req_sync_lock",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: btintel: serialize btintel_hw_error() with hci_req_sync_lock\n\nbtintel_hw_error() issues two __hci_cmd_sync() calls (HCI_OP_RESET\nand Intel exception-info retrieval) without holding\nhci_req_sync_lock().  This lets it race against\nhci_dev_do_close() -> btintel_shutdown_combined(), which also runs\n__hci_cmd_sync() under the same lock.  When both paths manipulate\nhdev->req_status/req_rsp concurrently, the close path may free the\nresponse skb first, and the still-running hw_error path hits a\nslab-use-after-free in kfree_skb().\n\nWrap the whole recovery sequence in hci_req_sync_lock/unlock so it\nis serialized with every other synchronous HCI command issuer.\n\nBelow is the data race report and the kasan report:\n\n  BUG: data-race in __hci_cmd_sync_sk / btintel_shutdown_combined\n\n  read of hdev->req_rsp at net/bluetooth/hci_sync.c:199\n  by task kworker/u17:1/83:\n   __hci_cmd_sync_sk+0x12f2/0x1c30 net/bluetooth/hci_sync.c:200\n   __hci_cmd_sync+0x55/0x80 net/bluetooth/hci_sync.c:223\n   btintel_hw_error+0x114/0x670 drivers/bluetooth/btintel.c:254\n   hci_error_reset+0x348/0xa30 net/bluetooth/hci_core.c:1030\n\n  write/free by task ioctl/22580:\n   btintel_shutdown_combined+0xd0/0x360\n    drivers/bluetooth/btintel.c:3648\n   hci_dev_close_sync+0x9ae/0x2c10 net/bluetooth/hci_sync.c:5246\n   hci_dev_do_close+0x232/0x460 net/bluetooth/hci_core.c:526\n\n  BUG: KASAN: slab-use-after-free in\n   sk_skb_reason_drop+0x43/0x380 net/core/skbuff.c:1202\n  Read of size 4 at addr ffff888144a738dc\n  by task kworker/u17:1/83:\n   __hci_cmd_sync_sk+0x12f2/0x1c30 net/bluetooth/hci_sync.c:200\n   __hci_cmd_sync+0x55/0x80 net/bluetooth/hci_sync.c:223\n   btintel_hw_error+0x186/0x670 drivers/bluetooth/btintel.c:260",
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