thunderbolt: Fix bandwidth group reservation indexing

{
  "id": "dea5ab43f9e7d7b280a7ea6619c7cb4528b3c14ea588220141a674daadca8118",
  "url": "https://osv.dev/vulnerability/CVE-2026-80736",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "thunderbolt: Fix bandwidth group reservation indexing",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: thunderbolt: Fix bandwidth group reservation indexing Valid bandwidth group IDs range from 1 through MAX_GROUPS, while Group ID 0 is reserved. tb_consumed_dp_bandwidth() uses the Group ID directly to index its local group_reserved[] array. The array currently has MAX_GROUPS entries, so its valid indices are 0 through MAX_GROUPS - 1. Group ID MAX_GROUPS therefore accesses one element past the end, and the final group's reserved bandwidth is not included when the array is summed. Give group_reserved[] MAX_GROUPS + 1 entries so direct Group ID indexing covers the reserved ID 0 and valid IDs 1 through MAX_GROUPS.",
    "evidence": "osv:CVE-2026-80736",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.104",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.45",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.9",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-80736",
      "aliases": [
        "CVE-2026-80736"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
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                  "fixed": "d2ee4d47aacbd2ba456092eeec670dba35fde291"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80736.json"
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        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.9.0"
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                {
                  "fixed": "6.12.104"
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            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "6.13.0"
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                {
                  "fixed": "6.18.45"
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            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "6.19.0"
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                  "fixed": "7.1.9"
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80736.json"
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      ],
      "modified": "2026-10-28T02:30:45.988170158Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0a8c9ed4f166216642a8c084f0de415169c88088",
        "https://git.kernel.org/stable/c/0bfb67ba366cd68d1d0ad935760577bae1d5df27",
        "https://git.kernel.org/stable/c/9977321835c7ae71d12a43bed7baa5bd514d01c3",
        "https://git.kernel.org/stable/c/d2ee4d47aacbd2ba456092eeec670dba35fde291",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80736.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-80736",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80736.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-80736",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 514296,
  "published_at": "2026-09-03T08:21:51.946+00:00"
}