{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-31408",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-31408"
  ],
  "published": "2026-04-06T07:40:10Z",
  "summary": "Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold\n\nsco_recv_frame() reads conn->sk under sco_conn_lock() but immediately\nreleases the lock without holding a reference to the socket. A concurrent\nclose() can free the socket between the lock release and the subsequent\nsk->sk_state access, resulting in a use-after-free.\n\nOther functions in the same file (sco_sock_timeout(), sco_conn_del())\ncorrectly use sco_sock_hold() to safely hold a reference under the lock.\n\nFix by using sco_sock_hold() to take a reference before releasing the\nlock, and adding sock_put() on all exit paths.",
  "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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      "url": "https://www.cve.org/CVERecord?id=CVE-2026-31408"
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      "scenario": "AV:A - Incoming Bluetooth SCO/eSCO data reaches the vulnerable function through the HCI receive path, so the attacker must be within Bluetooth radio range. This is adjacent-network reachability, not IP network or physical-device access.\nAC:L - The bug is a use-after-free race between received SCO data and socket close/teardown, and an attacker can repeatedly drive SCO traffic while provoking endpoint teardown to hit the window. No rare configuration or uncontrollable memory layout condition is required beyond Bluetooth SCO support.\nPR:N - The Bluetooth peer sending SCO data needs no account or privileges on the target system, and the per-packet receive path has no capability or authentication check. Incoming acceptance depends on Bluetooth connection/listening state, not target-user privileges held by the attacker.\nUI:N - Exploitation does not require a victim user to open a file, mount anything, or perform an explicit action. Once the Bluetooth/SCO endpoint is active, packets and teardown can be driven by protocol activity.\nS:U - The vulnerability is in the kernel Bluetooth stack and impacts the same kernel security authority. It is not a VM escape, IOMMU bypass, or other cross-scope boundary violation.\nC:H - This is a kernel use-after-free of a socket object, and subsequent code dereferences the freed sock and can pass it into receive-queue handling. Such heap UAFs can be leveraged for kernel memory disclosure, so confidentiality impact is high.\nI:H - The freed sock pointer can be used in `sock_queue_rcv_skb()`, which updates socket queues/state and can invoke socket callbacks after reuse. This is kernel memory corruption with plausible control-flow or arbitrary-write exploitation, so integrity impact is high.\nA:H - Even without full exploitation, dereferencing and operating on a freed kernel socket can cause an oops, panic, or memory corruption crash. Availability impact is therefore high."
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}