{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-89569",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-89569"
  ],
  "published": "2026-09-11T19:47:07Z",
  "summary": "Bluetooth: RFCOMM: serialize security confirmation handling",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: RFCOMM: serialize security confirmation handling\n\nrfcomm_security_cfm() looks up a session on session_list and then walks\nits DLC list without holding rfcomm_mutex. Since RFCOMM session teardown\nuses rfcomm_mutex, krfcommd can close and free the same session and DLCs\nconcurrently:\n\n  hci_rx_work                    krfcommd\n  -----------                    ---------\n  rfcomm_session_get()\n                                 rfcomm_lock()\n                                 rfcomm_session_close()\n                                   rfcomm_dlc_unlink()\n                                   rfcomm_session_del()\n                                     kfree(s)\n                                 rfcomm_unlock()\n  walk s->dlcs\n\nThe callback can then read a freed session list head and touch freed DLCs\nwhile updating their flags or timers.\n\nSerialize the session lookup and DLC traversal in rfcomm_security_cfm()\nwith rfcomm_mutex. This matches the existing RFCOMM session lifetime\nrules and prevents concurrent rfcomm_session_del() / rfcomm_dlc_unlink()\nfrom tearing the objects down while the callback is using them.\n\nKASAN reported:\n\n  BUG: KASAN: slab-use-after-free in rfcomm_security_cfm+0x41c/0x440\n  Read of size 8 at addr ffff888111fb3960 by task kworker/u17:1/89\n  Workqueue: hci0 hci_rx_work\n  Call Trace:\n   rfcomm_security_cfm+0x41c/0x440\n   hci_encrypt_cfm+0x139/0x590\n   hci_encrypt_change_evt+0x37b/0xc40\n   hci_event_packet+0x71b/0xb20\n   hci_rx_work+0x293/0x730\n  Allocated by task 69:\n   rfcomm_session_add+0x9e/0x2f0\n   rfcomm_run+0x44b/0x41e0\n  Freed by task 69:\n   kfree+0x131/0x3c0\n   rfcomm_session_del+0x188/0x220\n   rfcomm_run+0x1985/0x41e0",
  "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-2026-89569"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/62ce8b33eb238cf18c15207332fbdc26d858f592"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3873f3449701b3dc98cba577923be6493598e7a1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7ded3264106418c6456ccceaafd9fda596ce12c3"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/82425b14f0fb22e46cfddc56d6465570f5ed0ce6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1b7841ffad08e911e8c4b9470f3fa08423568940"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/946d76db77ee5f922968ce558629ae47b381e3fc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fbf7961964a6e93360179f64712320ae9a1e9577"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/759c185d0bbdb131357408f50b8735e04ed3caff"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-14T12:06:03Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:A - rfcomm_security_cfm() runs from hci_encrypt_cfm()/hci_auth_cfm() on hci_rx_work when the controller reports encryption or authentication complete. An in-range Bluetooth peer that opens an RFCOMM/L2CAP session can drive those HCI events; kernel CNA guidance scores Bluetooth as Adjacent.\nAC:L - The UAF is a race between hci_rx_work walking the session and krfcommd freeing it. A peer controls both sides by triggering encrypt/auth complete while disconnecting RFCOMM/L2CAP or the ACL link so krfcommd runs rfcomm_session_close(), and can retry until the window is hit.\nPR:N - A nearby Bluetooth device needs no Linux account or capability. krfcommd listens on L2CAP PSM RFCOMM at default BT_SECURITY_LOW, and HCI encrypt/auth complete (including failures) call rfcomm_security_cfm() with no local credential check.\nUI:N - Phones, cars, and IoT devices with Bluetooth enabled accept RFCOMM/L2CAP and emit encrypt-change events during ordinary link setup or teardown. No extra victim action such as pairing confirmation, mounting, or opening a file is required at exploit time.\nS:U - The UAF corrupts kernel RFCOMM session and DLC objects in the host Bluetooth stack. It does not cross a VM, IOMMU, or other security-authority boundary.\nC:H - After rfcomm_session_del() frees the session, the callback reads the slab-freed list head and DLC flags, state, and sec_level. Kernel UAF of these objects enables heap reuse and arbitrary kernel read primitives.\nI:H - The callback writes DLC flag bits and arms or cancels DLC timers on objects krfcommd may already have unlinked and freed, so a reused slab object can be corrupted or have its timer hijacked for control-flow takeover.\nA:H - KASAN reported slab-use-after-free in rfcomm_security_cfm() on hci_rx_work; triggering the race oopses or panics the kernel even without a full exploit."
    }
  }
}