Vulnerability-Lookup

FKIE_CVE-2026-80760

Vulnerability from fkie_nvd - Published: 2026-09-04 16:18 - Updated: 2026-09-04 16:18

Severity

Summary

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: MGMT: reject HCI_CMD_SYNC params_len above 255 mgmt_hci_cmd_sync() checks that the message length agrees with params_len but puts no upper bound on it. params_len is __le16 while the parameter length in the HCI command header is a u8: struct hci_command_hdr { __le16 opcode; __u8 plen; } __packed; hci_cmd_sync_alloc() assigns one to the other: hdr->plen = plen; if (plen) skb_put_data(skb, param, plen); so a params_len of 256 leaves plen at 0 while all 256 bytes are still appended. The frame handed to the driver then declares no parameters and carries 256 of them. On a length framed transport such as H:4 the controller takes the trailing bytes as the start of the next packet. The mgmt socket MTU is HCI_MAX_FRAME_SIZE, so params_len can reach about 1KB this way. Commit 03f1700b9b4d ("Bluetooth: MGMT: reject malformed HCI_CMD_SYNC commands") only made params_len agree with the message length, a value that fits the message but not the header field is still accepted. Reject params_len that does not fit the header field.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0bd0195ce25737cbdd0eabc54319ee0ddf3a0ad2
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5d95286b6d6e8f1d304da7522bfa6860fc017e48
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6e1c44878aa3ee7336efeaf01414b030b0a5c273
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b7d9edcf9fe6e9ec3a2e80ef9e8d44ef9b4f2894

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/mgmt.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b7d9edcf9fe6e9ec3a2e80ef9e8d44ef9b4f2894",
              "status": "affected",
              "version": "827af4787e74e8df9e8e0677a69fbb15e0856d2f",
              "versionType": "git"
            },
            {
              "lessThan": "0bd0195ce25737cbdd0eabc54319ee0ddf3a0ad2",
              "status": "affected",
              "version": "827af4787e74e8df9e8e0677a69fbb15e0856d2f",
              "versionType": "git"
            },
            {
              "lessThan": "6e1c44878aa3ee7336efeaf01414b030b0a5c273",
              "status": "affected",
              "version": "827af4787e74e8df9e8e0677a69fbb15e0856d2f",
              "versionType": "git"
            },
            {
              "lessThan": "5d95286b6d6e8f1d304da7522bfa6860fc017e48",
              "status": "affected",
              "version": "827af4787e74e8df9e8e0677a69fbb15e0856d2f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/mgmt.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.13"
            },
            {
              "lessThan": "6.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.47",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: MGMT: reject HCI_CMD_SYNC params_len above 255\n\nmgmt_hci_cmd_sync() checks that the message length agrees with params_len\nbut puts no upper bound on it. params_len is __le16 while the parameter\nlength in the HCI command header is a u8:\n\n\tstruct hci_command_hdr {\n\t\t__le16\topcode;\n\t\t__u8\tplen;\n\t} __packed;\n\nhci_cmd_sync_alloc() assigns one to the other:\n\n\thdr-\u003eplen = plen;\n\n\tif (plen)\n\t\tskb_put_data(skb, param, plen);\n\nso a params_len of 256 leaves plen at 0 while all 256 bytes are still\nappended. The frame handed to the driver then declares no parameters and\ncarries 256 of them. On a length framed transport such as H:4 the\ncontroller takes the trailing bytes as the start of the next packet.\n\nThe mgmt socket MTU is HCI_MAX_FRAME_SIZE, so params_len can reach about\n1KB this way. Commit 03f1700b9b4d (\"Bluetooth: MGMT: reject malformed\nHCI_CMD_SYNC commands\") only made params_len agree with the message\nlength, a value that fits the message but not the header field is still\naccepted.\n\nReject params_len that does not fit the header field."
    }
  ],
  "id": "CVE-2026-80760",
  "lastModified": "2026-09-04T16:18:01.070",
  "metrics": {},
  "published": "2026-09-04T16:18:01.070",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0bd0195ce25737cbdd0eabc54319ee0ddf3a0ad2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5d95286b6d6e8f1d304da7522bfa6860fc017e48"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6e1c44878aa3ee7336efeaf01414b030b0a5c273"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b7d9edcf9fe6e9ec3a2e80ef9e8d44ef9b4f2894"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-80760 (GCVE-0-2026-80760)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:12 – Updated: 2026-09-04 15:12

Title

Bluetooth: MGMT: reject HCI_CMD_SYNC params_len above 255

Summary

Severity

No CVSS data available.

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/b7d9edcf9fe6e9ec3…
https://git.kernel.org/stable/c/0bd0195ce25737cbd…
https://git.kernel.org/stable/c/6e1c44878aa3ee733…
https://git.kernel.org/stable/c/5d95286b6d6e8f1d3…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 827af4787e74e8df9e8e0677a69fbb15e0856d2f , < b7d9edcf9fe6e9ec3a2e80ef9e8d44ef9b4f2894 (git) Affected: 827af4787e74e8df9e8e0677a69fbb15e0856d2f , < 0bd0195ce25737cbdd0eabc54319ee0ddf3a0ad2 (git) Affected: 827af4787e74e8df9e8e0677a69fbb15e0856d2f , < 6e1c44878aa3ee7336efeaf01414b030b0a5c273 (git) Affected: 827af4787e74e8df9e8e0677a69fbb15e0856d2f , < 5d95286b6d6e8f1d304da7522bfa6860fc017e48 (git)
Linux	Linux	Affected: 6.13 Unaffected: 0 , < 6.13 (semver) Unaffected: 6.18.47 , ≤ 6.18.* (semver) Unaffected: 7.1.11 , ≤ 7.1.* (semver) Unaffected: 7.2.1 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/mgmt.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b7d9edcf9fe6e9ec3a2e80ef9e8d44ef9b4f2894",
              "status": "affected",
              "version": "827af4787e74e8df9e8e0677a69fbb15e0856d2f",
              "versionType": "git"
            },
            {
              "lessThan": "0bd0195ce25737cbdd0eabc54319ee0ddf3a0ad2",
              "status": "affected",
              "version": "827af4787e74e8df9e8e0677a69fbb15e0856d2f",
              "versionType": "git"
            },
            {
              "lessThan": "6e1c44878aa3ee7336efeaf01414b030b0a5c273",
              "status": "affected",
              "version": "827af4787e74e8df9e8e0677a69fbb15e0856d2f",
              "versionType": "git"
            },
            {
              "lessThan": "5d95286b6d6e8f1d304da7522bfa6860fc017e48",
              "status": "affected",
              "version": "827af4787e74e8df9e8e0677a69fbb15e0856d2f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/mgmt.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.13"
            },
            {
              "lessThan": "6.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.47",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.47",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.11",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.1",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: MGMT: reject HCI_CMD_SYNC params_len above 255\n\nmgmt_hci_cmd_sync() checks that the message length agrees with params_len\nbut puts no upper bound on it. params_len is __le16 while the parameter\nlength in the HCI command header is a u8:\n\n\tstruct hci_command_hdr {\n\t\t__le16\topcode;\n\t\t__u8\tplen;\n\t} __packed;\n\nhci_cmd_sync_alloc() assigns one to the other:\n\n\thdr-\u003eplen = plen;\n\n\tif (plen)\n\t\tskb_put_data(skb, param, plen);\n\nso a params_len of 256 leaves plen at 0 while all 256 bytes are still\nappended. The frame handed to the driver then declares no parameters and\ncarries 256 of them. On a length framed transport such as H:4 the\ncontroller takes the trailing bytes as the start of the next packet.\n\nThe mgmt socket MTU is HCI_MAX_FRAME_SIZE, so params_len can reach about\n1KB this way. Commit 03f1700b9b4d (\"Bluetooth: MGMT: reject malformed\nHCI_CMD_SYNC commands\") only made params_len agree with the message\nlength, a value that fits the message but not the header field is still\naccepted.\n\nReject params_len that does not fit the header field."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-04T15:12:32.306Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b7d9edcf9fe6e9ec3a2e80ef9e8d44ef9b4f2894"
        },
        {
          "url": "https://git.kernel.org/stable/c/0bd0195ce25737cbdd0eabc54319ee0ddf3a0ad2"
        },
        {
          "url": "https://git.kernel.org/stable/c/6e1c44878aa3ee7336efeaf01414b030b0a5c273"
        },
        {
          "url": "https://git.kernel.org/stable/c/5d95286b6d6e8f1d304da7522bfa6860fc017e48"
        }
      ],
      "title": "Bluetooth: MGMT: reject HCI_CMD_SYNC params_len above 255",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80760",
    "datePublished": "2026-09-04T15:12:32.306Z",
    "dateReserved": "2026-08-26T14:34:25.791Z",
    "dateUpdated": "2026-09-04T15:12:32.306Z",
    "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.

Detection rules are retrieved from Rulezet.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

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