CVE-2026-68392 (GCVE-0-2026-68392)
Vulnerability from cvelistv5
Published
2026-08-10 12:04
Modified
2026-08-23 12:46
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: 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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 7fe4d391e937c2f048a43ff4b421e677f10d83c0
Version: 249c88e7fb45b6b705040c5af4bd0d0f2bc9735c
Version: 227a0cdf4a028a73dc256d0f5144b4808d718893
Version: 227a0cdf4a028a73dc256d0f5144b4808d718893
Version: 227a0cdf4a028a73dc256d0f5144b4808d718893
Version: 227a0cdf4a028a73dc256d0f5144b4808d718893
Version: 58afdc9b18871eb1d461c725be9e9f3f44a39aeb
Version: 6.6.51   ≤
Version: 6.10.10   ≤
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/mgmt.c"
          ],
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          "vendor": "Linux",
          "versions": [
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        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/mgmt.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.148",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.101",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.148",
                  "versionStartIncluding": "6.6.51",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.101",
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.6",
                  "versionStartIncluding": "6.11",
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.10.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-23T12:46:21.017Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/74f3e6e21ebc6c418d348f8ce68aef6fe6d82c82"
        },
        {
          "url": "https://git.kernel.org/stable/c/8bc83f9ef6789571f399ff631a2a14a12b6d8585"
        },
        {
          "url": "https://git.kernel.org/stable/c/579faba5ede6df6b7f36777c431dc8dcf9d272e7"
        },
        {
          "url": "https://git.kernel.org/stable/c/ca58ad287bfc5b9d31a72ecb8650289df2b57250"
        },
        {
          "url": "https://git.kernel.org/stable/c/b11511006f9e17000de3f4cadee451364f658ca3"
        },
        {
          "url": "https://git.kernel.org/stable/c/16cd66443957e4ad42155c6fec401012f600c6f8"
        }
      ],
      "title": "Bluetooth: mgmt: fix locking in unpair_device/disconnect_sync",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68392",
    "datePublished": "2026-08-10T12:04:11.543Z",
    "dateReserved": "2026-07-30T09:28:09.388Z",
    "dateUpdated": "2026-08-23T12:46:21.017Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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