{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-56654",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-56654"
  ],
  "published": "2024-12-27T15:08:24Z",
  "summary": "Bluetooth: hci_event: Fix using rcu_read_(un)lock while iterating",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_event: Fix using rcu_read_(un)lock while iterating\n\nThe usage of rcu_read_(un)lock while inside list_for_each_entry_rcu is\nnot safe since for the most part entries fetched this way shall be\ntreated as rcu_dereference:\n\n\tNote that the value returned by rcu_dereference() is valid\n\tonly within the enclosing RCU read-side critical section [1]_.\n\tFor example, the following is **not** legal::\n\n\t\trcu_read_lock();\n\t\tp = rcu_dereference(head.next);\n\t\trcu_read_unlock();\n\t\tx = p->address;\t/* BUG!!! */\n\t\trcu_read_lock();\n\t\ty = p->data;\t/* BUG!!! */\n\t\trcu_read_unlock();",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/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-2024-56654"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0108132d7d76d884e443d18b4f067cdf2811911b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f9ecc90b5d501b3a5a62d0685d5104f934bb0104"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/581dd2dc168fe0ed2a7a5534a724f0d3751c93ae"
    }
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    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:52:36Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable event handler runs in response to an HCI_LE_Create_BIG command that the local host issues only when a local process creates broadcast ISO sockets via the AF_BLUETOOTH/BTPROTO_ISO syscall interface. BIG creation involves no remote peer, so the attacker must have local system access.\nAC:L - The attacker fully controls both the number of bound BIS connections and the QoS parameters that determine whether the controller returns a failing Create BIG status, and the freed pointer is dereferenced deterministically by the loop's increment step on every failed BIG creation. Heap grooming to control the reallocated hci_conn contents is done from the attacker's own threads.\nPR:L - iso_sock_create(), iso_sock_bind(), and iso_sock_connect() perform no capable() checks, so any unprivileged local user \u2014 or a sandboxed Android app with Bluetooth access \u2014 can bind and connect the ISO sockets that drive the vulnerable path. No CAP_NET_ADMIN or root is needed to reach the bug.\nUI:N - The entire sequence is driven by the attacker's own socket, setsockopt, bind, and connect calls. No victim action or interaction is required.\nS:U - The use-after-free corrupts kernel heap memory and is exploited within the kernel's own security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The stale RCU pointer is read from a freed, attacker-sprayable hci_conn slab object, and the resulting pointer is dereferenced at multiple offsets (dst, type, iso_qos), yielding an arbitrary kernel-memory read primitive. The unbounded ev->bis_handle[i++] indexing adds an additional out-of-bounds read.\nI:H - After the free the loop writes through the attacker-controlled pointer (conn->state assignment and set_bit on conn->flags) and calls hci_conn_del(), which invokes conn->cleanup(conn) \u2014 an indirect call through an attacker-supplied function pointer, giving arbitrary write and control-flow hijack.\nA:H - Iterating from a kfree'd list node reliably produces a wild-pointer dereference, KASAN splat, or kernel panic even without successful heap grooming. The crash is triggerable on demand by any local user."
    }
  }
}