CVE-2026-64128 (GCVE-0-2026-64128)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:40 – Updated: 2026-07-19 15:40
VLAI
Title
Bluetooth: ISO: drop ISO_END frames received without prior ISO_START
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: drop ISO_END frames received without prior ISO_START ISO data PDUs carry a packet-boundary flag indicating START, CONT, END or SINGLE. The ISO_CONT branch of iso_recv() guards against a missing ISO_START by checking conn->rx_len before touching conn->rx_skb, but ISO_END does not. If a peer sends an ISO_END as the first packet on a fresh ISO connection, conn->rx_skb is still NULL and conn->rx_len is zero, so skb_put(conn->rx_skb, ...) dereferences NULL and oopses. For BIS, where receivers sync to a broadcaster without pairing, any broadcaster on the air can trigger this. Mirror the ISO_CONT check at the top of ISO_END so a stray end fragment is logged and dropped instead of crashing the host.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < 1c3d1e1696b72579b970e17999c503a14535205b (git)
Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < 3af41ee7ebecb0d5c8a504861f6cfad31345310f (git)
Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < 39f4a82e80c8f5ed2d6952d73fbafc895721a728 (git)
Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < 61f2410a96dee808029e2ae4d6ef2dd635f3477f (git)
Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < e3a799881c12d27596232636a607e2e3fa448d63 (git)
Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < 84c24fb151fc1179355296d7ff29129ac7c42129 (git)
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Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.142 , ≤ 6.6.* (semver)
Unaffected: 6.12.92 , ≤ 6.12.* (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "net/bluetooth/iso.c"
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              "version": "7.0.11",
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              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: drop ISO_END frames received without prior ISO_START\n\nISO data PDUs carry a packet-boundary flag indicating START, CONT, END\nor SINGLE. The ISO_CONT branch of iso_recv() guards against a missing\nISO_START by checking conn-\u003erx_len before touching conn-\u003erx_skb, but\nISO_END does not.\n\nIf a peer sends an ISO_END as the first packet on a fresh ISO\nconnection, conn-\u003erx_skb is still NULL and conn-\u003erx_len is zero, so\nskb_put(conn-\u003erx_skb, ...) dereferences NULL and oopses. For BIS,\nwhere receivers sync to a broadcaster without pairing, any broadcaster\non the air can trigger this.\n\nMirror the ISO_CONT check at the top of ISO_END so a stray end fragment\nis logged and dropped instead of crashing the host."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-19T15:40:24.678Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/1c3d1e1696b72579b970e17999c503a14535205b"
        },
        {
          "url": "https://git.kernel.org/stable/c/3af41ee7ebecb0d5c8a504861f6cfad31345310f"
        },
        {
          "url": "https://git.kernel.org/stable/c/39f4a82e80c8f5ed2d6952d73fbafc895721a728"
        },
        {
          "url": "https://git.kernel.org/stable/c/61f2410a96dee808029e2ae4d6ef2dd635f3477f"
        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/84c24fb151fc1179355296d7ff29129ac7c42129"
        }
      ],
      "title": "Bluetooth: ISO: drop ISO_END frames received without prior ISO_START",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64128",
    "datePublished": "2026-07-19T15:40:24.678Z",
    "dateReserved": "2026-07-19T07:54:57.036Z",
    "dateUpdated": "2026-07-19T15:40:24.678Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-07-21",
      "epss": "0.0018",
      "percentile": "0.07803"
    },
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-20T11:01:11+00:00",
      "cve": "CVE-2026-64128",
      "id": "CVE-2026-64128",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "91",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: ISO: drop ISO_END frames received without prior ISO_START",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64128.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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