FKIE_CVE-2026-46111

Vulnerability from fkie_nvd - Published: 2026-05-28 10:16 - Updated: 2026-05-30 11:17
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_conn: fix potential UAF in create_big_sync Add hci_conn_valid() check in create_big_sync() to detect stale connections before proceeding with BIG creation. Handle the resulting -ECANCELED in create_big_complete() and re-validate the connection under hci_dev_lock() before dereferencing, matching the pattern used by create_le_conn_complete() and create_pa_complete(). Keep the hci_conn object alive across the async boundary by taking a reference via hci_conn_get() when queueing create_big_sync(), and dropping it in the completion callback. The refcount and the lock are complementary: the refcount keeps the object allocated, while hci_dev_lock() serializes hci_conn_hash_del()'s list_del_rcu() on hdev->conn_hash, as required by hci_conn_del(). hci_conn_put() is called outside hci_dev_unlock() so the final put (which resolves to kfree() via bt_link_release) does not run under hdev->lock, though the release path would be safe either way. Without this, create_big_complete() would unconditionally dereference the conn pointer on error, causing a use-after-free via hci_connect_cfm() and hci_conn_del().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0beddb0c380bed5f5b8e61ddbe14635bb73d0b41
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1750a2df0eab61dc421a7afae74abdd239a44b85
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6823f730bf195fc296d9edd09e2ca94bc1ff5584
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dc34f8d8240f25dd137dc2758ebbcc75e3779142
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f8eaf92c57ad99358dd372580d5ff87623343a72
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_conn: fix potential UAF in create_big_sync\n\nAdd hci_conn_valid() check in create_big_sync() to detect stale\nconnections before proceeding with BIG creation. Handle the\nresulting -ECANCELED in create_big_complete() and re-validate the\nconnection under hci_dev_lock() before dereferencing, matching the\npattern used by create_le_conn_complete() and create_pa_complete().\n\nKeep the hci_conn object alive across the async boundary by taking\na reference via hci_conn_get() when queueing create_big_sync(), and\ndropping it in the completion callback. The refcount and the lock\nare complementary: the refcount keeps the object allocated, while\nhci_dev_lock() serializes hci_conn_hash_del()\u0027s list_del_rcu() on\nhdev-\u003econn_hash, as required by hci_conn_del().\n\nhci_conn_put() is called outside hci_dev_unlock() so the final put\n(which resolves to kfree() via bt_link_release) does not run under\nhdev-\u003elock, though the release path would be safe either way.\n\nWithout this, create_big_complete() would unconditionally\ndereference the conn pointer on error, causing a use-after-free\nvia hci_connect_cfm() and hci_conn_del()."
    }
  ],
  "id": "CVE-2026-46111",
  "lastModified": "2026-05-30T11:17:21.647",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-05-28T10:16:26.550",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0beddb0c380bed5f5b8e61ddbe14635bb73d0b41"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1750a2df0eab61dc421a7afae74abdd239a44b85"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6823f730bf195fc296d9edd09e2ca94bc1ff5584"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/dc34f8d8240f25dd137dc2758ebbcc75e3779142"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f8eaf92c57ad99358dd372580d5ff87623343a72"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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