{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-40318",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-40318"
  ],
  "published": "2025-12-08T00:47:38Z",
  "summary": "Bluetooth: hci_sync: fix race in hci_cmd_sync_dequeue_once",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: fix race in hci_cmd_sync_dequeue_once\n\nhci_cmd_sync_dequeue_once() does lookup and then cancel\nthe entry under two separate lock sections. Meanwhile,\nhci_cmd_sync_work() can also delete the same entry,\nleading to double list_del() and \"UAF\".\n\nFix this by holding cmd_sync_work_lock across both\nlookup and cancel, so that the entry cannot be removed\nconcurrently.",
  "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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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-40318"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0a94f7e017438935c09ef833a1aa908ad9875213"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/932c0a4f77ac13e526fdd5b42914d29c9821d389"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ae76cf6c2c842944c6514c57df54d728f1916553"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9cd536970192b72257afcdfba0bfc09993e6f19c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/09b0cd1297b4dbfe736aeaa0ceeab2265f47f772"
    }
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:A - The flaw is in the Bluetooth HCI command-sync queue, and the create-connection entries it manages are queued and aborted in response to LE/ACL link events from a peer in radio range (advertising reports driving `check_pending_le_conn()`, and `le_conn_timeout` when the peer stops responding). An attacker within Bluetooth range can drive both the queue and cancel sides without any local access.\nAC:L - The attacker controls both sides of the race \u2014 repeatedly forcing connection attempts and aborts cycles `hci_cancel_connect_sync()` against the `cmd_sync_work` kthread draining the same list entry, and the attempt can be retried without limit. The window sits between two lock acquisitions in the same function with the worker on a separate CPU, making it readily hit on SMP.\nPR:N - The adjacent attacker holds no credentials on the target: the LE create-connection queue/cancel cycle happens entirely before pairing or authentication completes. Even on the purely local path only an unprivileged AF_BLUETOOTH socket is needed, since `l2cap_sock_create()` gates only SOCK_RAW behind CAP_NET_RAW.\nUI:N - Background LE auto-connect and connection-timeout handling proceed autonomously in kernel workqueues with no victim action. No file must be opened, device mounted, or prompt accepted.\nS:U - The corruption is confined to kernel heap objects managed by the same kernel security authority; there is no VM, IOMMU, or sandbox boundary crossed. Impact is standard in-kernel compromise.\nC:H - The use-after-free reads `entry->destroy` and `entry->data` out of a freed kmalloc-64 object and dereferences them, and the resulting hijacked call plus double-`list_del` write primitive can be leveraged into arbitrary kernel memory disclosure. Freed-slab reads alone already expose adjacent kernel heap contents.\nI:H - `_hci_cmd_sync_cancel_entry()` calls a function pointer read from freed memory and then performs a double `list_del()` that writes attacker-groomable pointers to attacker-groomable addresses, plus a double `kfree()`. That combination is a direct control-flow-hijack and arbitrary-write path to full kernel code execution.\nA:H - Without successful grooming the same code path dereferences LIST_POISON or freed slab contents, producing a `list_del corruption` BUG, GPF, or panic. The double free additionally corrupts the slab allocator, crashing the system."
    }
  }
}