mptcp: reclaim forward-allocated memory on RX path errors

{
  "id": "ee8ba7551222df004fcb0d4d1d0cbfca0c2a32fca1115d5ec02f546969acd255",
  "url": "https://osv.dev/vulnerability/CVE-2026-80588",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "mptcp: reclaim forward-allocated memory on RX path errors",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: mptcp: reclaim forward-allocated memory on RX path errors After commit 9db5b3cec4ec (\"mptcp: borrow forward memory from subflow\"), errors in the receive path prior to queueing skbs into the receive queue do not trigger forward-allocated memory reclaiming. Prevent forward memory from growing unboundedly in pathological drop scenarios by explicitly reclaiming memory when skbs are dropped.",
    "evidence": "osv:CVE-2026-80588",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.46",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-80588",
      "aliases": [
        "CVE-2026-80588"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
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                {
                  "fixed": "473f1a5ab2abc98dd9e74b95b9c23c66c47535cc"
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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                  "introduced": "6.18.35"
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            "v6.18.44",
            "v6.18.43",
            "v6.18.42",
            "v6.18.41",
            "v6.18.40",
            "v6.18.39",
            "v6.18.38",
            "v6.18.37",
            "v6.18.36",
            "v6.18.35"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80588.json"
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        },
        {
          "ranges": [
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              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
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            {
              "type": "ECOSYSTEM",
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                  "introduced": "6.19.0"
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80588.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:28.814307587Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/41b49a8b914ec7dcb03eae93fb27f3c464078644",
        "https://git.kernel.org/stable/c/473f1a5ab2abc98dd9e74b95b9c23c66c47535cc",
        "https://git.kernel.org/stable/c/8277f48a06d3aa1441f6d0b6998ccc0360d30ed8",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80588.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-80588",
        "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-2026-80588.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-80588",
        "evidence": "/id"
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    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 495828,
  "published_at": "2026-08-26T14:37:42.685+00:00"
}