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CVE-2026-74528 (GCVE-0-2026-74528)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-17 05:48
VLAI
Title
Bluetooth: hci_sync: hold conn in hci_past_sync() callback
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: hold conn in hci_past_sync() callback Avoids giving freed pointers to hci_conn_valid(), which kmalloc may have reused. Hold refcount to avoid that.
Severity
8 (High)
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d3413703d5f8b7d1e6f514f9440ed5da1bc30796 , < e6792adef614b389141b142e30ee549e4a47dd7d (git)
Affected: d3413703d5f8b7d1e6f514f9440ed5da1bc30796 , < abf9753edf3f88282c44a605f3945d8d4f8dd86c (git)
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Linux Linux Affected: 6.19
Unaffected: 0 , < 6.19 (semver)
Unaffected: 7.1.8 , ≤ 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": [
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              "versionType": "git"
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              "version": "7.1.8",
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            {
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              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
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          ]
        }
      ],
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                  "vulnerable": true
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: hold conn in hci_past_sync() callback\n\nAvoids giving freed pointers to hci_conn_valid(), which kmalloc may have\nreused.\n\nHold refcount to avoid that."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - The bug is in Bluetooth LE PAST handling reached via ISO socket bind() rebind; exploitation requires an active LE connection to an adjacent peer and the freeing race is routinely won by concurrent local disconnects or a remote BLE link teardown, matching the CNA Bluetooth-adjacent threat model for phones and laptops in radio range.\nAC:L - An attacker controls both sides of the race by calling bind() to queue hci_past_sync() while concurrently closing the ISO socket or tearing down the looked-up LE link; repeated attempts can reliably free hci_conn objects before the hci_cmd_sync work callback runs without uncontrollable layout or timing dependencies.\nPR:L - Once the ISO socket layer is active (typically enabled by bluetoothd at boot), any unprivileged local user can open AF_BLUETOOTH SOCK_SEQPACKET ISO sockets and invoke the vulnerable bind() rebind path without CAP_NET_ADMIN; Bluetooth sockets are restricted to init_net and are not available through user namespaces.\nUI:N - Exploitation is driven entirely by the attacker\u0027s own socket operations and coordinated disconnects; no action by another user or administrator (pairing prompts, mounting, or opening files) is required beyond normal Bluetooth being enabled on the host.\nS:U - The use-after-free corrupts kernel heap objects and enables standard local kernel privilege escalation within the same security authority; it does not cross VM, hypervisor, or IOMMU boundaries.\nC:H - Without refcounting, freed hci_conn pointers are passed to hci_conn_valid(); if kmalloc reuses the slab for another hci_conn the check can succeed and the callback reads handle, sync_handle, and iso_qos fields from attacker-influenced freed/reused memory, giving UAF-based kernel information disclosure.\nI:H - Slab reuse of the freed hci_conn lets an attacker shape heap contents so stale pointer dereferences and subsequent HCI PAST commands operate on attacker-controlled data, providing the memory corruption and arbitrary-write primitives typical of kernel use-after-free exploitation.\nA:H - Use-after-free on hci_conn structures in hci_cmd_sync work can cause KASAN slab-use-after-free reports, kernel oopses, or panics when freed memory is reused or corrupted, and misdirected PAST HCI commands can additionally disrupt or wedge Bluetooth connectivity on the host."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:48:17.804Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e6792adef614b389141b142e30ee549e4a47dd7d"
        },
        {
          "url": "https://git.kernel.org/stable/c/abf9753edf3f88282c44a605f3945d8d4f8dd86c"
        }
      ],
      "title": "Bluetooth: hci_sync: hold conn in hci_past_sync() callback",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74528",
    "datePublished": "2026-08-15T12:27:44.181Z",
    "dateReserved": "2026-08-15T05:44:03.912Z",
    "dateUpdated": "2026-08-17T05:48:17.804Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-74528",
      "date": "2026-09-04",
      "epss": "0.0023",
      "percentile": "0.13691"
    },
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T14:19:39+00:00",
      "cve": "CVE-2026-74528",
      "id": "CVE-2026-74528",
      "initial_release_date": "2026-08-15T00:00:00+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 conn in hci_past_sync() callback",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74528.json",
      "version": "3"
    }
  }
}



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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.


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