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

Vulnerability from cvelistv5 – Published: 2026-08-10 12:04 – Updated: 2026-08-17 05:04
VLAI
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
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c530569adc19b5f0c62955de41f067bad34e3fe0 , < 8d892bec1dd134761cabec6ba23fe315d0f20f98 (git)
Affected: c530569adc19b5f0c62955de41f067bad34e3fe0 , < c363202ec841df36421ec280eea3d5f94f556143 (git)
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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": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/hci_sync.c"
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          "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."
            }
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      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:04:37.940Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/c363202ec841df36421ec280eea3d5f94f556143"
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    "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"
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    "redhat_vex": {
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      "current_release_date": "2026-08-13T23:27:11+00:00",
      "cve": "CVE-2026-68390",
      "id": "CVE-2026-68390",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: hci_sync: hold hdev-\u003elock for hci_conn_params lookups",
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      "cve": "CVE-2026-68390",
      "id": "CVE-2026-68390",
      "initial_release_date": "2026-08-13T16:22:40Z",
      "product_status:known_not_affected": "296",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68390",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68390.json",
      "version": "2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.