CVE-2026-89768 fs: fix user path of nested backing files

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "fs/backing-file.c"
    ],
    "versions": [
      {
        "version": "5b6aa9a843205da92d860e5011a7b29062a76b8f",
        "lessThan": "88c927a63dc717b6d46b20fe13ea713916e49089",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "5dfcb15974e7d0f96aca278dd9f1b85df91523ef",
        "lessThan": "c03114634d342648bd34910aa8fb88007e92cc3c",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "6af36aeb147a06dea47c49859cd6ca5659aeb987",
        "lessThan": "a35cc21355734e1acb89973d9be90ca8e4c3ed2f",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "6af36aeb147a06dea47c49859cd6ca5659aeb987",
        "lessThan": "f2381b546e7e6a35c9fcee0d0ccb6c042a9aeb5d",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "41c5b269af8b1f0bffcab7766a793f294ae6764e",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "27e795afba0018b0ea9460dbad4bd706d1ba5ee0",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "6.12.95",
        "lessThan": "6.12.109",
        "status": "affected",
        "versionType": "semver"
      },
      {
        "version": "6.18.38",
        "lessThan": "6.18.50",
        "status": "affected",
        "versionType": "semver"
      },
      {
        "version": "6.6.144",
        "lessThan": "6.7",
        "status": "affected",
        "versionType": "semver"
      },
      {
        "version": "7.0.4",
        "lessThan": "7.1",
        "status": "affected",
        "versionType": "semver"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "fs/backing-file.c"
    ],
    "versions": [
      {
        "version": "7.1",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "7.1",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.12.109",
        "lessThanOrEqual": "6.12.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.18.50",
        "lessThanOrEqual": "6.18.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.2.4",
        "lessThanOrEqual": "7.2.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.3-rc1",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]