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

Vulnerability from cvelistv5 – Published: 2026-09-04 15:12 – Updated: 2026-09-04 15:12
VLAI
Title
Bluetooth: MGMT: reject HCI_CMD_SYNC params_len above 255
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 827af4787e74e8df9e8e0677a69fbb15e0856d2f , < b7d9edcf9fe6e9ec3a2e80ef9e8d44ef9b4f2894 (git)
Affected: 827af4787e74e8df9e8e0677a69fbb15e0856d2f , < 0bd0195ce25737cbdd0eabc54319ee0ddf3a0ad2 (git)
Affected: 827af4787e74e8df9e8e0677a69fbb15e0856d2f , < 6e1c44878aa3ee7336efeaf01414b030b0a5c273 (git)
Affected: 827af4787e74e8df9e8e0677a69fbb15e0856d2f , < 5d95286b6d6e8f1d304da7522bfa6860fc017e48 (git)
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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)
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{
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/mgmt.c"
          ],
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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: 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": [
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          "url": "https://git.kernel.org/stable/c/b7d9edcf9fe6e9ec3a2e80ef9e8d44ef9b4f2894"
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          "url": "https://git.kernel.org/stable/c/0bd0195ce25737cbdd0eabc54319ee0ddf3a0ad2"
        },
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          "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": {
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      }
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  },
  "cveMetadata": {
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    "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",
  "vulnerability-lookup:meta": {
    "epss": {
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      "date": "2026-09-14",
      "epss": "0.00168",
      "percentile": "0.06348"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-80760\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-04T16:18:01.070\",\"lastModified\":\"2026-09-04T16:18:01.070\",\"vulnStatus\":\"Received\",\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/bluetooth/mgmt.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"827af4787e74e8df9e8e0677a69fbb15e0856d2f\",\"lessThan\":\"b7d9edcf9fe6e9ec3a2e80ef9e8d44ef9b4f2894\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"827af4787e74e8df9e8e0677a69fbb15e0856d2f\",\"lessThan\":\"0bd0195ce25737cbdd0eabc54319ee0ddf3a0ad2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"827af4787e74e8df9e8e0677a69fbb15e0856d2f\",\"lessThan\":\"6e1c44878aa3ee7336efeaf01414b030b0a5c273\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"827af4787e74e8df9e8e0677a69fbb15e0856d2f\",\"lessThan\":\"5d95286b6d6e8f1d304da7522bfa6860fc017e48\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/bluetooth/mgmt.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.13\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.13\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.47\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.11\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.1\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-07T16:20:12Z",
      "cve": "CVE-2026-80760",
      "id": "CVE-2026-80760",
      "initial_release_date": "2026-09-05T00:28:02Z",
      "product_status:known_not_affected": "353",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80760",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80760.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.


Detection rules are retrieved from Rulezet.