Vulnerability-Lookup

GHSA-RQW2-7C22-Q555

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: hci_sync: hold hdev->lock for hci_conn_params lookups

hci_conn_params_lookup requires hdev->lock be held, otherwise the list iteration or param access is not safe.

Hold hdev->lock for params lookups in hci_sync.

Severity

8.8 (High)


                  
                    CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-68390"
  ],
  "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: hci_sync: hold hdev-\u003elock for hci_conn_params lookups\n\nhci_conn_params_lookup requires hdev-\u003elock be held, otherwise the list\niteration or param access is not safe.\n\nHold hdev-\u003elock for params lookups in hci_sync.",
  "id": "GHSA-rqw2-7c22-q555",
  "modified": "2026-08-14T00:31:57Z",
  "published": "2026-08-10T15:33:49Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68390"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8d892bec1dd134761cabec6ba23fe315d0f20f98"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c363202ec841df36421ec280eea3d5f94f556143"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-68390 (GCVE-0-2026-68390)

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

Title

Bluetooth: hci_sync: hold hdev->lock for hci_conn_params lookups

Summary

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: hold hdev->lock for hci_conn_params lookups hci_conn_params_lookup requires hdev->lock be held, otherwise the list iteration or param access is not safe. Hold hdev->lock for params lookups in hci_sync.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

2 references

URL	Tags
https://git.kernel.org/stable/c/8d892bec1dd134761…
https://git.kernel.org/stable/c/c363202ec841df364…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: c530569adc19b5f0c62955de41f067bad34e3fe0 , < 8d892bec1dd134761cabec6ba23fe315d0f20f98 (git) Affected: c530569adc19b5f0c62955de41f067bad34e3fe0 , < c363202ec841df36421ec280eea3d5f94f556143 (git)
Linux	Linux	Affected: 6.19 Unaffected: 0 , < 6.19 (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/hci_sync.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "8d892bec1dd134761cabec6ba23fe315d0f20f98",
              "status": "affected",
              "version": "c530569adc19b5f0c62955de41f067bad34e3fe0",
              "versionType": "git"
            },
            {
              "lessThan": "c363202ec841df36421ec280eea3d5f94f556143",
              "status": "affected",
              "version": "c530569adc19b5f0c62955de41f067bad34e3fe0",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/hci_sync.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.19"
            },
            {
              "lessThan": "6.19",
              "status": "unaffected",
              "version": "0",
              "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": "7.1.6",
                  "versionStartIncluding": "6.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: hold hdev-\u003elock for hci_conn_params lookups\n\nhci_conn_params_lookup requires hdev-\u003elock be held, otherwise the list\niteration or param access is not safe.\n\nHold hdev-\u003elock for params lookups in hci_sync."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - The vulnerable hci_sync paths are Bluetooth LE host-stack code: hci_le_create_conn_sync is queued autonomously from check_pending_le_conn() on incoming LE advertising reports, and the racing hci_conn_params_del() side is driven by LE connection-complete/failure and disconnect events, so a device in radio range drives the bug over the air.\nAC:L - The attacker controls both sides of the race \u2014 repeated LE connect/disconnect and PA-sync setup/teardown cycles queue the cmd_sync work while the event workqueue concurrently runs hci_conn_params_del()/hci_conn_del() under hdev-\u003elock \u2014 and the sleeping hci_pause_advertising_sync() right before the unlocked lookup widens the window, so it can be retried until won.\nPR:N - No credentials, pairing, or local account are needed: the host stack queues hci_le_create_conn_sync automatically in response to advertising reports from a device on the accept list, and the freeing side is triggered by connection-complete/failure events the peer controls.\nUI:N - Background LE scanning, auto-connect, accept-list programming, and connection-failure cleanup are performed autonomously by the kernel whenever connection state changes; no victim action such as pairing confirmation or opening a device is required.\nS:U - The corruption is confined to kernel heap objects owned by the Bluetooth subsystem within the same security authority; no hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - hci_conn_params_lookup() iterates and dereferences a list entry that another CPU may have list_del()\u0027d and kfree()\u0027d, and hci_le_pa_create_sync() reads le-\u003edst/le-\u003ehandle from a possibly freed hci_conn; a groomed slab yields an arbitrary read primitive, and the stale values are copied into the outgoing HCI command, leaking kernel heap contents over the air.\nI:H - This is a classic slab use-after-free on hci_conn_params/hci_conn: reclaiming the freed object with attacker-controlled data gives write and control-flow primitives, and the corrupted values are written into conn-\u003ele_conn_* fields and the HCI command payload, so kernel memory corruption and privilege escalation are leverageable.\nA:H - Walking le_conn_params without hdev-\u003elock while an entry is removed dereferences LIST_POISON1 or freed memory, producing slab-use-after-free KASAN splats, oopses, or a kernel panic in the Bluetooth workqueues."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:04:37.940Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8d892bec1dd134761cabec6ba23fe315d0f20f98"
        },
        {
          "url": "https://git.kernel.org/stable/c/c363202ec841df36421ec280eea3d5f94f556143"
        }
      ],
      "title": "Bluetooth: hci_sync: hold hdev-\u003elock for hci_conn_params lookups",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68390",
    "datePublished": "2026-08-10T12:04:09.373Z",
    "dateReserved": "2026-07-30T09:28:09.388Z",
    "dateUpdated": "2026-08-17T05:04:37.940Z",
    "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.

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GHSA-RQW2-7C22-Q555

CVE-2026-68390 (GCVE-0-2026-68390)

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Sightings

Nomenclature