FKIE_CVE-2026-46138

Vulnerability from fkie_nvd - Published: 2026-05-28 10:16 - Updated: 2026-05-28 13:44
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_event: Fix OOB read and infinite loop in hci_le_create_big_complete_evt hci_le_create_big_complete_evt() iterates over BT_BOUND connections for a BIG handle using a while loop, accessing ev->bis_handle[i++] on each iteration. However, there is no check that i stays within ev->num_bis before the array access. When a controller sends a LE_Create_BIG_Complete event with fewer bis_handle entries than there are BT_BOUND connections for that BIG, or with num_bis=0, the loop reads beyond the valid bis_handle[] flex array into adjacent heap memory. Since the out-of-bounds values typically exceed HCI_CONN_HANDLE_MAX (0x0EFF), hci_conn_set_handle() rejects them and the connection remains in BT_BOUND state. The same connection is then found again by hci_conn_hash_lookup_big_state(), creating an infinite loop with hci_dev_lock held. Fix this by terminating the BIG if in case not all BIS could be setup properly.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/22559ad7654f61727fc270ee4893da9f4b70cf17
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5ddb8014261137cadaf83ab5617a588d80a22586
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/665da0baaf0396f9ed3c86ccb3955dcd0b73e774
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6cb7f67bc28da787499291a562d49a084d9c90cd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/77981a507aa0fc001dc37f0dd6631dd2042fed17
Impacted products
Vendor Product Version
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_event: Fix OOB read and infinite loop in hci_le_create_big_complete_evt\n\nhci_le_create_big_complete_evt() iterates over BT_BOUND connections for\na BIG handle using a while loop, accessing ev-\u003ebis_handle[i++] on each\niteration.  However, there is no check that i stays within ev-\u003enum_bis\nbefore the array access.\n\nWhen a controller sends a LE_Create_BIG_Complete event with fewer\nbis_handle entries than there are BT_BOUND connections for that BIG,\nor with num_bis=0, the loop reads beyond the valid bis_handle[] flex\narray into adjacent heap memory.  Since the out-of-bounds values\ntypically exceed HCI_CONN_HANDLE_MAX (0x0EFF), hci_conn_set_handle()\nrejects them and the connection remains in BT_BOUND state.  The same\nconnection is then found again by hci_conn_hash_lookup_big_state(),\ncreating an infinite loop with hci_dev_lock held.\n\nFix this by terminating the BIG if in case not all BIS could be setup\nproperly."
    }
  ],
  "id": "CVE-2026-46138",
  "lastModified": "2026-05-28T13:44:01.663",
  "metrics": {},
  "published": "2026-05-28T10:16:29.357",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/22559ad7654f61727fc270ee4893da9f4b70cf17"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5ddb8014261137cadaf83ab5617a588d80a22586"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/665da0baaf0396f9ed3c86ccb3955dcd0b73e774"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6cb7f67bc28da787499291a562d49a084d9c90cd"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/77981a507aa0fc001dc37f0dd6631dd2042fed17"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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