Vulnerability-Lookup

GHSA-MGRM-7XVJ-2JR3

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-27 06:30

Details

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: bnep: pin L2CAP connection during netdev registration

bnep_add_connection() reads the L2CAP connection without holding the channel lock, then passes its HCI device to register_netdev(). Controller teardown can clear and release that connection concurrently, leaving the network device registration path to dereference a freed parent device.

Take a reference to the L2CAP connection while holding the channel lock. Retain it until register_netdev() has taken the parent device reference.

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-2026-64408"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:24Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: bnep: pin L2CAP connection during netdev registration\n\nbnep_add_connection() reads the L2CAP connection without holding the\nchannel lock, then passes its HCI device to register_netdev(). Controller\nteardown can clear and release that connection concurrently, leaving the\nnetwork device registration path to dereference a freed parent device.\n\nTake a reference to the L2CAP connection while holding the channel lock.\nRetain it until register_netdev() has taken the parent device reference.",
  "id": "GHSA-mgrm-7xvj-2jr3",
  "modified": "2026-07-27T06:30:36Z",
  "published": "2026-07-25T12:31:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64408"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/390b5db3ff8745187f094c4e915663b7b1f98944"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/46a88784c4c9b96954dd86f747ce93f65efa1302"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/551ae773ec64045b4e72099132654887e0270bcc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/563a8573047182f550b1e1e030615755cd8c41da"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a6b22dbd80926556290ad2243be25218d6956a19"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ae215c5b6422d8eda443b861b124bd1be6969c31"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bb067a99a0356196c0b89a95721985485ebce5a5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/df22adc7eafc22e651561813c11dc51a796b12ee"
    }
  ],
  "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-2026-64408 (GCVE-0-2026-64408)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-08-17 04:55

Title

Bluetooth: bnep: pin L2CAP connection during netdev registration

Summary

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: bnep: pin L2CAP connection during netdev registration bnep_add_connection() reads the L2CAP connection without holding the channel lock, then passes its HCI device to register_netdev(). Controller teardown can clear and release that connection concurrently, leaving the network device registration path to dereference a freed parent device. Take a reference to the L2CAP connection while holding the channel lock. Retain it until register_netdev() has taken the parent device reference.

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

8 references

URL	Tags
https://git.kernel.org/stable/c/390b5db3ff8745187…
https://git.kernel.org/stable/c/46a88784c4c9b9695…
https://git.kernel.org/stable/c/551ae773ec64045b4…
https://git.kernel.org/stable/c/ae215c5b6422d8eda…
https://git.kernel.org/stable/c/df22adc7eafc22e65…
https://git.kernel.org/stable/c/a6b22dbd809265562…
https://git.kernel.org/stable/c/563a8573047182f55…
https://git.kernel.org/stable/c/bb067a99a0356196c…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 65f53e9802dbfae0e5758a91793c3f5f8bece49b , < 390b5db3ff8745187f094c4e915663b7b1f98944 (git) Affected: 65f53e9802dbfae0e5758a91793c3f5f8bece49b , < 46a88784c4c9b96954dd86f747ce93f65efa1302 (git) Affected: 65f53e9802dbfae0e5758a91793c3f5f8bece49b , < 551ae773ec64045b4e72099132654887e0270bcc (git) Affected: 65f53e9802dbfae0e5758a91793c3f5f8bece49b , < ae215c5b6422d8eda443b861b124bd1be6969c31 (git) Affected: 65f53e9802dbfae0e5758a91793c3f5f8bece49b , < df22adc7eafc22e651561813c11dc51a796b12ee (git) Affected: 65f53e9802dbfae0e5758a91793c3f5f8bece49b , < a6b22dbd80926556290ad2243be25218d6956a19 (git) Affected: 65f53e9802dbfae0e5758a91793c3f5f8bece49b , < 563a8573047182f550b1e1e030615755cd8c41da (git) Affected: 65f53e9802dbfae0e5758a91793c3f5f8bece49b , < bb067a99a0356196c0b89a95721985485ebce5a5 (git)
Linux	Linux	Affected: 3.13 Unaffected: 0 , < 3.13 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/bnep/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "status": "affected",
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              "versionType": "git"
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            {
              "lessThan": "46a88784c4c9b96954dd86f747ce93f65efa1302",
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              "version": "65f53e9802dbfae0e5758a91793c3f5f8bece49b",
              "versionType": "git"
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            {
              "lessThan": "551ae773ec64045b4e72099132654887e0270bcc",
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              "version": "65f53e9802dbfae0e5758a91793c3f5f8bece49b",
              "versionType": "git"
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              "version": "65f53e9802dbfae0e5758a91793c3f5f8bece49b",
              "versionType": "git"
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              "version": "65f53e9802dbfae0e5758a91793c3f5f8bece49b",
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              "status": "affected",
              "version": "3.13"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.96",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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                  "versionStartIncluding": "3.13",
                  "vulnerable": true
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                {
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                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "3.13",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: bnep: pin L2CAP connection during netdev registration\n\nbnep_add_connection() reads the L2CAP connection without holding the\nchannel lock, then passes its HCI device to register_netdev(). Controller\nteardown can clear and release that connection concurrently, leaving the\nnetwork device registration path to dereference a freed parent device.\n\nTake a reference to the L2CAP connection while holding the channel lock.\nRetain it until register_netdev() has taken the parent device reference."
        }
      ],
      "metrics": [
        {
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            "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 - An adjacent Bluetooth peer can initiate a BNEP/PAN connection that causes privileged bluetoothd to issue BNEPCONNADD, then tear down the ACL link during netdev registration. Exploitation therefore requires Bluetooth radio adjacency.\nAC:L - The peer controls both the connection setup that triggers the ioctl and the competing disconnect, and can repeat attempts until the lifetime window is hit. No condition beyond the attacker\u0027s practical control is required.\nPR:N - The adjacent peer needs no Linux credentials or capabilities because root bluetoothd performs the CAP_NET_ADMIN ioctl on its behalf in an enabled, auto-authorized PAN deployment. The direct ioctl requires CAP_NET_ADMIN in the initial user namespace, but the adjacent path does not.\nUI:N - An enabled PAN service can automatically accept or pre-authorize connections, after which setup and teardown require no victim action. Prior service configuration is not user interaction during exploitation.\nS:U - The memory corruption occurs in the host kernel and compromises resources governed by that same kernel security authority. It does not cross a VM, IOMMU, or comparable security boundary.\nC:H - The stale parent points into a freed hci_conn allocation, and reclaiming that use-after-free object can enable disclosure of arbitrary kernel memory. Confidentiality impact is therefore High.\nI:H - device_add() calls get_device() on the freed parent, producing a refcount write into reclaimed memory and potentially further device-list corruption. The use-after-free can support arbitrary kernel-memory corruption or control-flow hijacking.\nA:H - The use-after-free can cause a kernel oops, panic, or corrupted device hierarchy during netdev registration. An adjacent peer can repeatedly initiate and terminate connections to crash the system."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:55:06.785Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/390b5db3ff8745187f094c4e915663b7b1f98944"
        },
        {
          "url": "https://git.kernel.org/stable/c/46a88784c4c9b96954dd86f747ce93f65efa1302"
        },
        {
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        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/df22adc7eafc22e651561813c11dc51a796b12ee"
        },
        {
          "url": "https://git.kernel.org/stable/c/a6b22dbd80926556290ad2243be25218d6956a19"
        },
        {
          "url": "https://git.kernel.org/stable/c/563a8573047182f550b1e1e030615755cd8c41da"
        },
        {
          "url": "https://git.kernel.org/stable/c/bb067a99a0356196c0b89a95721985485ebce5a5"
        }
      ],
      "title": "Bluetooth: bnep: pin L2CAP connection during netdev registration",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64408",
    "datePublished": "2026-07-25T08:50:49.807Z",
    "dateReserved": "2026-07-19T15:36:31.786Z",
    "dateUpdated": "2026-08-17T04:55:06.785Z",
    "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.

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-MGRM-7XVJ-2JR3

CVE-2026-64408 (GCVE-0-2026-64408)

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