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CVE-2026-80692 (GCVE-0-2026-80692)

Vulnerability from cvelistv5 – Published: 2026-08-28 06:52 – Updated: 2026-08-29 06:22
VLAI
Title
Bluetooth: hci_sync: hold conn in hci_connect_acl/le_sync() callbacks
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: hold conn in hci_connect_acl/le_sync() callbacks There is theoretical UAF if the conn is freed while the hci_sync task is running. Hold refcount to avoid that.
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: 881559af5f5c545f6828e7c74d79813eb886d523 , < 9a77f296aff4b2ca5f2928ab3a3220c82d8b4074 (git)
Affected: 881559af5f5c545f6828e7c74d79813eb886d523 , < 2f5d635ad5906b0235bc0c870e8beba3116e1e98 (git)
Affected: d948e1ffa1d40240d5c81af6dcbcb87b39cb8d3c (git)
Affected: 5dd0bd277a0a936708a33ecc447dce77a08cbde6 (git)
Affected: 6.6.51 , < 6.7 (semver)
Affected: 6.8.9 , < 6.9 (semver)
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Linux Linux Affected: 6.9
Unaffected: 0 , < 6.9 (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/hci_sync.c"
          ],
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          "vendor": "Linux",
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              "status": "affected",
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              "versionType": "git"
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              "versionType": "git"
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              "operator": "OR"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: hold conn in hci_connect_acl/le_sync() callbacks\n\nThere is theoretical UAF if the conn is freed while the hci_sync task\nis running.\n\nHold refcount to avoid that."
        }
      ],
      "metrics": [
        {
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            "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 - Bluetooth HCI outgoing ACL/LE connection setup (hci_connect_acl_sync/hci_connect_le_sync) is driven by adjacent radio peers supplying HCI events (connection complete/failures, command status) while hci_cmd_sync_work blocks on controller replies on phones and laptops.\nAC:L - Race between hci_cmd_sync_work using a bare hci_conn pointer and hci_conn_del/hci_conn_failed/create_le_conn_complete teardown; attacker controls both sides by concurrently initiating L2CAP/MGMT connects and aborting or inducing remote HCI failure events until the window hits.\nPR:N - Adjacent Bluetooth peers need no Linux credentials; freeing runs on unauthenticated HCI connection events, and local triggering works via unprivileged AF_BLUETOOTH L2CAP connect() without CAP_NET_ADMIN or special namespaces.\nUI:N - Background Bluetooth auto-reconnect, pairing flows, or listening socket-driven outgoing connects create BT_OPEN hci_conn objects without deliberate user action; attacker timing of connect/teardown does not require social engineering.\nS:U - Kernel heap UAF within the Bluetooth stack enables local privilege escalation in the same kernel domain but does not cross VM, IOMMU, or sandbox boundaries.\nC:H - Freed struct hci_conn is dereferenced in hci_acl_create_conn_sync, hci_le_create_conn_sync, and create_le_conn_complete (e.g., conn-\u003epkt_type, conn-\u003edst, conn-\u003ele_conn_timeout), enabling slab reuse and arbitrary kernel memory disclosure.\nI:H - Post-free writes occur to conn fields (state, flags, timers) and function-pointer members (cleanup, connect_cfm_cb), providing groomable heap corruption suitable for arbitrary kernel write and code execution.\nA:H - UAF during hci_cmd_sync_work on connection setup reliably causes kernel oops/panic and can be retriggered by repeated connect/abort cycles from adjacent or local attackers."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-29T06:22:15.862Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/9a77f296aff4b2ca5f2928ab3a3220c82d8b4074"
        },
        {
          "url": "https://git.kernel.org/stable/c/2f5d635ad5906b0235bc0c870e8beba3116e1e98"
        }
      ],
      "title": "Bluetooth: hci_sync: hold conn in hci_connect_acl/le_sync() callbacks",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80692",
    "datePublished": "2026-08-28T06:52:55.529Z",
    "dateReserved": "2026-08-26T14:34:25.785Z",
    "dateUpdated": "2026-08-29T06:22:15.862Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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      "percentile": "0.12421"
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      "product_status:known_affected": "1",
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      "title": "Bluetooth: hci_sync: hold conn in hci_connect_acl/le_sync() callbacks",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-80692.json",
      "version": "1"
    },
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-31T16:59:45+00:00",
      "cve": "CVE-2026-80692",
      "id": "CVE-2026-80692",
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      "product_status:known_affected": "184",
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      "status": "final",
      "title": "kernel: Bluetooth: hci_sync: hold conn in hci_connect_acl/le_sync() callbacks",
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      "current_release_date": "2026-09-04T00:21:51Z",
      "cve": "CVE-2026-80692",
      "id": "CVE-2026-80692",
      "initial_release_date": "2026-08-28T16:34:00Z",
      "product_status:known_affected": "30",
      "product_status:known_not_affected": "323",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80692",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80692.json",
      "version": "4"
    }
  }
}



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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.