CVE-2026-68392 (GCVE-0-2026-68392)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:04 – Updated: 2026-08-23 12:46
VLAI
Title
Bluetooth: mgmt: fix locking in unpair_device/disconnect_sync
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: mgmt: fix locking in unpair_device/disconnect_sync Dereferencing RCU-protected pointers outside critical sections is invalid and may lead to UAF. Take hdev->lock for hci_conn lookup and hci_abort_conn(). Don't use RCU to ensure the conn is fully initialized at this point.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7fe4d391e937c2f048a43ff4b421e677f10d83c0 , < 74f3e6e21ebc6c418d348f8ce68aef6fe6d82c82 (git)
Affected: 249c88e7fb45b6b705040c5af4bd0d0f2bc9735c , < 8bc83f9ef6789571f399ff631a2a14a12b6d8585 (git)
Affected: 227a0cdf4a028a73dc256d0f5144b4808d718893 , < 579faba5ede6df6b7f36777c431dc8dcf9d272e7 (git)
Affected: 227a0cdf4a028a73dc256d0f5144b4808d718893 , < ca58ad287bfc5b9d31a72ecb8650289df2b57250 (git)
Affected: 227a0cdf4a028a73dc256d0f5144b4808d718893 , < b11511006f9e17000de3f4cadee451364f658ca3 (git)
Affected: 227a0cdf4a028a73dc256d0f5144b4808d718893 , < 16cd66443957e4ad42155c6fec401012f600c6f8 (git)
Affected: 58afdc9b18871eb1d461c725be9e9f3f44a39aeb (git)
Affected: 6.6.51 , < 6.6.148 (semver)
Affected: 6.10.10 , < 6.11 (semver)
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Linux Linux Affected: 6.11
Unaffected: 0 , < 6.11 (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
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          "product": "Linux",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: mgmt: fix locking in unpair_device/disconnect_sync\n\nDereferencing RCU-protected pointers outside critical sections is\ninvalid and may lead to UAF.\n\nTake hdev-\u003elock for hci_conn lookup and hci_abort_conn().  Don\u0027t use RCU\nto ensure the conn is fully initialized at this point."
        }
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            "baseSeverity": "HIGH",
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            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable path is entered by a local process sending MGMT_OP_DISCONNECT/MGMT_OP_UNPAIR_DEVICE on an AF_BLUETOOTH/BTPROTO_HCI socket bound to HCI_CHANNEL_CONTROL, and the freeing side is drivable locally via /dev/vhci events or ioctl(HCIDEVDOWN)/hci_conn_hash_flush; no over-the-air access is required.\nAC:L - The attacker controls both sides of the race \u2014 repeatedly queuing the mgmt command while tearing the connection down (vhci-injected disconnect-complete, HCIDEVDOWN, or connection timeout) \u2014 and can retry indefinitely, so the window is reached reliably.\nPR:L - The mgmt command needs a trusted control socket, but that capability is routinely held by the Bluetooth daemon and exposed to unprivileged session users through BlueZ Disconnect/RemoveDevice D-Bus methods, so an ordinary local user can drive the path with attacker-chosen addresses.\nUI:N - Both the mgmt command and the concurrent connection teardown are initiated programmatically by the attacker; no victim action such as pairing confirmation or opening a file is needed.\nS:U - The corruption is confined to kernel heap objects managed by the Bluetooth subsystem within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - hci_abort_conn() dereferences the freed hci_conn (conn-\u003ehdev, conn-\u003eabort_reason, conn-\u003ehandle) after it has been unlinked and released, so an attacker who reclaims the slab with controlled data obtains a read primitive over kernel memory and can leak pointers.\nI:H - The use-after-free is not read-only: hci_abort_conn() stores the attacker-reachable reason byte into conn-\u003eabort_reason and hci_conn_get() increments a refcount inside the freed object, giving a write primitive into reclaimed heap memory that is leverageable for control-flow hijack.\nA:H - Dereferencing a freed or partially initialized hci_conn and then queuing abort_conn_sync on it produces slab-use-after-free oopses, refcount underflow, and kernel panics, crashing the system."
            }
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      "title": "Bluetooth: mgmt: fix locking in unpair_device/disconnect_sync",
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    "datePublished": "2026-08-10T12:04:11.543Z",
    "dateReserved": "2026-07-30T09:28:09.388Z",
    "dateUpdated": "2026-08-23T12:46:21.017Z",
    "state": "PUBLISHED"
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          }
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        "id": "CVE-2026-68392",
        "lastModified": "2026-08-23T13:16:36.690",
        "metrics": {
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                "confidentialityImpact": "HIGH",
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                "privilegesRequired": "LOW",
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      "cve": "CVE-2026-68392",
      "id": "CVE-2026-68392",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_affected": "275",
      "product_status:known_not_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: mgmt: fix locking in unpair_device/disconnect_sync",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68392.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-18T00:30:53Z",
      "cve": "CVE-2026-68392",
      "id": "CVE-2026-68392",
      "initial_release_date": "2026-08-13T16:22:36Z",
      "product_status:known_affected": "394",
      "product_status:known_not_affected": "337",
      "product_status:recommended": "107",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68392",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68392.json",
      "version": "7"
    }
  }
}



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