Vulnerability-Lookup

GHSA-29HQ-HF65-36HV

Vulnerability from github – Published: 2026-08-10 15:33 – Updated: 2026-08-14 00:31

Details

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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-68392"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-10T13:20:32Z",
    "severity": "HIGH"
  },
  "details": "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.",
  "id": "GHSA-29hq-hf65-36hv",
  "modified": "2026-08-14T00:31:57Z",
  "published": "2026-08-10T15:33:49Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68392"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/16cd66443957e4ad42155c6fec401012f600c6f8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/579faba5ede6df6b7f36777c431dc8dcf9d272e7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8bc83f9ef6789571f399ff631a2a14a12b6d8585"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b11511006f9e17000de3f4cadee451364f658ca3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ca58ad287bfc5b9d31a72ecb8650289df2b57250"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2026-08-10 12:04 – Updated: 2026-08-17 05:04

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

Linux mitre root

References

5 references

URL	Tags
https://git.kernel.org/stable/c/8bc83f9ef6789571f…
https://git.kernel.org/stable/c/579faba5ede6df6b7…
https://git.kernel.org/stable/c/ca58ad287bfc5b9d3…
https://git.kernel.org/stable/c/b11511006f9e17000…
https://git.kernel.org/stable/c/16cd66443957e4ad4…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	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)
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)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/mgmt.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "8bc83f9ef6789571f399ff631a2a14a12b6d8585",
              "status": "affected",
              "version": "249c88e7fb45b6b705040c5af4bd0d0f2bc9735c",
              "versionType": "git"
            },
            {
              "lessThan": "579faba5ede6df6b7f36777c431dc8dcf9d272e7",
              "status": "affected",
              "version": "227a0cdf4a028a73dc256d0f5144b4808d718893",
              "versionType": "git"
            },
            {
              "lessThan": "ca58ad287bfc5b9d31a72ecb8650289df2b57250",
              "status": "affected",
              "version": "227a0cdf4a028a73dc256d0f5144b4808d718893",
              "versionType": "git"
            },
            {
              "lessThan": "b11511006f9e17000de3f4cadee451364f658ca3",
              "status": "affected",
              "version": "227a0cdf4a028a73dc256d0f5144b4808d718893",
              "versionType": "git"
            },
            {
              "lessThan": "16cd66443957e4ad42155c6fec401012f600c6f8",
              "status": "affected",
              "version": "227a0cdf4a028a73dc256d0f5144b4808d718893",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "58afdc9b18871eb1d461c725be9e9f3f44a39aeb",
              "versionType": "git"
            },
            {
              "lessThan": "6.6.148",
              "status": "affected",
              "version": "6.6.51",
              "versionType": "semver"
            },
            {
              "lessThan": "6.11",
              "status": "affected",
              "version": "6.10.10",
              "versionType": "semver"
            }
          ]
        },
        {
          "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": [
            {
              "status": "affected",
              "version": "6.11"
            },
            {
              "lessThan": "6.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "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",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.42",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.6",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "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": "2026-08-17T05:04:40.127Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "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": "2026-08-17T05:04:40.127Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

GHSA-29HQ-HF65-36HV

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

Tags

Sightings

Nomenclature