CVE-2026-53072 (GCVE-0-2026-53072)
Vulnerability from cvelistv5
Published
2026-06-24 16:30
Modified
2026-08-05 12:33
Severity ?
8.8 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: fix locking in hci_conn_request_evt() with HCI_PROTO_DEFER When protocol sets HCI_PROTO_DEFER, hci_conn_request_evt() calls hci_connect_cfm(conn) without hdev->lock. Generally hci_connect_cfm() assumes it is held, and if conn is deleted concurrently -> UAF. Only SCO and ISO set HCI_PROTO_DEFER and only for defer setup listen, and HCI_EV_CONN_REQUEST is not generated for ISO. In the non-deferred listening socket code paths, hci_connect_cfm(conn) is called with hdev->lock held. Fix by holding the lock.
References
Impacted products
Vendor Product Version
Linux Linux Version: 70c464256310e1c3716099b9d02ece4169272f73
Version: 70c464256310e1c3716099b9d02ece4169272f73
Version: 70c464256310e1c3716099b9d02ece4169272f73
Version: 70c464256310e1c3716099b9d02ece4169272f73
Version: 70c464256310e1c3716099b9d02ece4169272f73
Version: 70c464256310e1c3716099b9d02ece4169272f73
Version: 70c464256310e1c3716099b9d02ece4169272f73
Version: 70c464256310e1c3716099b9d02ece4169272f73
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{
  "containers": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/hci_event.c"
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              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
        {
          "nodes": [
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: fix locking in hci_conn_request_evt() with HCI_PROTO_DEFER\n\nWhen protocol sets HCI_PROTO_DEFER, hci_conn_request_evt() calls\nhci_connect_cfm(conn) without hdev-\u003elock. Generally hci_connect_cfm()\nassumes it is held, and if conn is deleted concurrently -\u003e UAF.\n\nOnly SCO and ISO set HCI_PROTO_DEFER and only for defer setup listen,\nand HCI_EV_CONN_REQUEST is not generated for ISO.  In the non-deferred\nlistening socket code paths, hci_connect_cfm(conn) is called with\nhdev-\u003elock held.\n\nFix by holding the lock."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - The vulnerable path is reached through Bluetooth HCI connection request handling for incoming SCO/eSCO connections from a nearby Bluetooth peer, so exploitation requires adjacency to the target Bluetooth radio.\nAC:L - The attacker can repeatedly initiate deferred SCO/eSCO connection attempts and race connection teardown/cleanup; when uncertain for this race, the higher-severity low-complexity rating is appropriate.\nPR:N - The remote Bluetooth peer reaches the pre-authentication connection request path without local privileges or verified credentials; local deferred-listener configuration is an environmental precondition, not attacker privilege.\nUI:N - Once the target has a deferred SCO/eSCO listener, the attacker can trigger the vulnerable HCI event without requiring a victim to perform an action.\nS:U - The bug is in the kernel Bluetooth stack and impacts the same kernel security authority; it is not a VM, sandbox, or hardware boundary escape by itself.\nC:H - The flaw is a use-after-free of an hci_conn object, and kernel heap UAFs can be leveraged for memory disclosure primitives in a plausible exploitation scenario.\nI:H - The freed hci_conn contains pointers, callback state, and protocol data used by confirmation callbacks, making control-flow or arbitrary memory corruption a defensible high-integrity impact for a kernel UAF.\nA:H - Even without full exploitation, dereferencing a concurrently freed hci_conn can crash or destabilize the kernel, causing high availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:33:06.917Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/60e3f4ff02d1f2d55bfbf2ca32a97285a9771ee4"
        },
        {
          "url": "https://git.kernel.org/stable/c/9d4a6c0f43fc5e4d4f062e8e450e5483eb74176e"
        },
        {
          "url": "https://git.kernel.org/stable/c/c7777f534a8018ae4bb1c80d8925af4df588a314"
        },
        {
          "url": "https://git.kernel.org/stable/c/6b4d226d01ab7da0d2027a2a1e3a6079152e5065"
        },
        {
          "url": "https://git.kernel.org/stable/c/541d5bf9b5afaf41090b2a3aa7b47f2db2ff801f"
        },
        {
          "url": "https://git.kernel.org/stable/c/385b2d0468a0871fc716c549fa3b0c257c7dbcb3"
        },
        {
          "url": "https://git.kernel.org/stable/c/c27224daf0b08efbb2b24ed64b6139b294f5473a"
        },
        {
          "url": "https://git.kernel.org/stable/c/5c7209a341ff2ac338b2b0375c34a307b37c9ac2"
        }
      ],
      "title": "Bluetooth: fix locking in hci_conn_request_evt() with HCI_PROTO_DEFER",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53072",
    "datePublished": "2026-06-24T16:30:13.570Z",
    "dateReserved": "2026-06-09T07:44:35.383Z",
    "dateUpdated": "2026-08-05T12:33:06.917Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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