CVE-2026-89785 (GCVE-0-2026-89785)
Vulnerability from cvelistv5
Published
2026-09-16 08:48
Modified
2026-10-19 08:52
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: fix out-of-bounds read of INDEX_ROOT in reparse/objid init ntfs_reparse_init() and ntfs_objid_init() parse the index root of the $Extend/$Reparse and $Extend/$ObjId metafiles (the INDEX_ROOT attributes named $R and $O). They read its type and rule fields through resident_data(), which does not check that the resident attribute is large enough to hold them. mi_enum_attr() accepts a resident attribute with data_off == asize and data_size == 0. For such an attribute placed last in its MFT record, resident_data() returns a pointer to the end of the record_size buffer, so reading root->type / root->rule reads past the allocation. Use resident_data_ex(attr, sizeof(struct INDEX_ROOT)) and bail out when it returns NULL, as ntfs_security_init() already does for $SDH / $SII. The attribute is only parsed while mounting a crafted image, so this needs CAP_SYS_ADMIN. BUG: KASAN: slab-out-of-bounds in ntfs_reparse_init (fs/ntfs3/fsntfs.c:2306) Read of size 4 at addr ffff88801219dc00 by task mount ntfs_reparse_init (fs/ntfs3/fsntfs.c:2306) ntfs_fill_super (fs/ntfs3/super.c:1604) get_tree_bdev_flags (fs/super.c:1703) vfs_get_tree (fs/super.c:1758) path_mount (fs/namespace.c:4131) __x64_sys_mount (fs/namespace.c:4360)
References
Impacted products
Vendor Product Version
Linux Linux Version: 82cae269cfa953032fbb8980a7d554d60fb00b17
Version: 82cae269cfa953032fbb8980a7d554d60fb00b17
Version: 82cae269cfa953032fbb8980a7d554d60fb00b17
Version: 82cae269cfa953032fbb8980a7d554d60fb00b17
Version: 82cae269cfa953032fbb8980a7d554d60fb00b17
Version: 82cae269cfa953032fbb8980a7d554d60fb00b17
Version: 82cae269cfa953032fbb8980a7d554d60fb00b17
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{
  "containers": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
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          "vendor": "Linux",
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              "version": "7.2.6",
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              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: fix out-of-bounds read of INDEX_ROOT in reparse/objid init\n\nntfs_reparse_init() and ntfs_objid_init() parse the index root of the\n$Extend/$Reparse and $Extend/$ObjId metafiles (the INDEX_ROOT attributes\nnamed $R and $O). They read its type and rule fields through\nresident_data(), which does not check that the resident attribute is\nlarge enough to hold them.\n\nmi_enum_attr() accepts a resident attribute with data_off == asize and\ndata_size == 0. For such an attribute placed last in its MFT record,\nresident_data() returns a pointer to the end of the record_size buffer,\nso reading root-\u003etype / root-\u003erule reads past the allocation.\n\nUse resident_data_ex(attr, sizeof(struct INDEX_ROOT)) and bail out when\nit returns NULL, as ntfs_security_init() already does for $SDH / $SII.\n\nThe attribute is only parsed while mounting a crafted image, so this\nneeds CAP_SYS_ADMIN.\n\n BUG: KASAN: slab-out-of-bounds in ntfs_reparse_init (fs/ntfs3/fsntfs.c:2306)\n Read of size 4 at addr ffff88801219dc00 by task mount\n  ntfs_reparse_init (fs/ntfs3/fsntfs.c:2306)\n  ntfs_fill_super (fs/ntfs3/super.c:1604)\n  get_tree_bdev_flags (fs/super.c:1703)\n  vfs_get_tree (fs/super.c:1758)\n  path_mount (fs/namespace.c:4131)\n  __x64_sys_mount (fs/namespace.c:4360)"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:52:38.323Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/eb80003744e32a7366a523015e4acfe0a2ac7d88"
        },
        {
          "url": "https://git.kernel.org/stable/c/bd631e2005290a55c8edda87363bc0d594c01705"
        },
        {
          "url": "https://git.kernel.org/stable/c/94fce1d3e74fe011e21f17490ba58491709fd7e5"
        },
        {
          "url": "https://git.kernel.org/stable/c/66c074eab6f966fbe48a0fc4b3a45b2a2e2df527"
        },
        {
          "url": "https://git.kernel.org/stable/c/64bb6000bfbdf241a6dd578199acd90321a4243e"
        },
        {
          "url": "https://git.kernel.org/stable/c/72caafbc95c5dca8266a942b8e96ad81d8d9adc7"
        },
        {
          "url": "https://git.kernel.org/stable/c/2064bc663f89e61b8681c1fb9d1ce445de72063d"
        }
      ],
      "title": "fs/ntfs3: fix out-of-bounds read of INDEX_ROOT in reparse/objid init",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89785",
    "datePublished": "2026-09-16T08:48:23.084Z",
    "dateReserved": "2026-09-11T19:38:34.766Z",
    "dateUpdated": "2026-10-19T08:52:38.323Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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