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CVE-2026-89785 (GCVE-0-2026-89785)

Vulnerability from cvelistv5 – Published: 2026-09-16 08:48 – Updated: 2026-09-16 08:48
VLAI
Title
fs/ntfs3: fix out-of-bounds read of INDEX_ROOT in reparse/objid init
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)
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 82cae269cfa953032fbb8980a7d554d60fb00b17 , < eb80003744e32a7366a523015e4acfe0a2ac7d88 (git)
Affected: 82cae269cfa953032fbb8980a7d554d60fb00b17 , < bd631e2005290a55c8edda87363bc0d594c01705 (git)
Affected: 82cae269cfa953032fbb8980a7d554d60fb00b17 , < 94fce1d3e74fe011e21f17490ba58491709fd7e5 (git)
Affected: 82cae269cfa953032fbb8980a7d554d60fb00b17 , < 66c074eab6f966fbe48a0fc4b3a45b2a2e2df527 (git)
Affected: 82cae269cfa953032fbb8980a7d554d60fb00b17 , < 64bb6000bfbdf241a6dd578199acd90321a4243e (git)
Affected: 82cae269cfa953032fbb8980a7d554d60fb00b17 , < 72caafbc95c5dca8266a942b8e96ad81d8d9adc7 (git)
Affected: 82cae269cfa953032fbb8980a7d554d60fb00b17 , < 2064bc663f89e61b8681c1fb9d1ce445de72063d (git)
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Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
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              "status": "unaffected",
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
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                  "versionStartIncluding": "5.15",
                  "vulnerable": true
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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": "2026-09-16T08:48:23.084Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/eb80003744e32a7366a523015e4acfe0a2ac7d88"
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        },
        {
          "url": "https://git.kernel.org/stable/c/2064bc663f89e61b8681c1fb9d1ce445de72063d"
        }
      ],
      "title": "fs/ntfs3: fix out-of-bounds read of INDEX_ROOT in reparse/objid init",
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  "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": "2026-09-16T08:48:23.084Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-09-16",
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      "cve": "CVE-2026-89785",
      "id": "msrc_CVE-2026-89785",
      "initial_release_date": "2026-09-17T01:13:25.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "fs/ntfs3: fix out-of-bounds read of INDEX_ROOT in reparse/objid init",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-89785.json",
      "version": "1"
    },
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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)\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/ntfs3/fsntfs.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"82cae269cfa953032fbb8980a7d554d60fb00b17\",\"lessThan\":\"eb80003744e32a7366a523015e4acfe0a2ac7d88\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"82cae269cfa953032fbb8980a7d554d60fb00b17\",\"lessThan\":\"bd631e2005290a55c8edda87363bc0d594c01705\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"82cae269cfa953032fbb8980a7d554d60fb00b17\",\"lessThan\":\"94fce1d3e74fe011e21f17490ba58491709fd7e5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"82cae269cfa953032fbb8980a7d554d60fb00b17\",\"lessThan\":\"66c074eab6f966fbe48a0fc4b3a45b2a2e2df527\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"82cae269cfa953032fbb8980a7d554d60fb00b17\",\"lessThan\":\"64bb6000bfbdf241a6dd578199acd90321a4243e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"82cae269cfa953032fbb8980a7d554d60fb00b17\",\"lessThan\":\"72caafbc95c5dca8266a942b8e96ad81d8d9adc7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"82cae269cfa953032fbb8980a7d554d60fb00b17\",\"lessThan\":\"2064bc663f89e61b8681c1fb9d1ce445de72063d\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/ntfs3/fsntfs.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.15\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.15\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.221\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.188\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.157\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.110\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.52\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.6\",\"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/2064bc663f89e61b8681c1fb9d1ce445de72063d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/64bb6000bfbdf241a6dd578199acd90321a4243e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/66c074eab6f966fbe48a0fc4b3a45b2a2e2df527\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/72caafbc95c5dca8266a942b8e96ad81d8d9adc7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/94fce1d3e74fe011e21f17490ba58491709fd7e5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bd631e2005290a55c8edda87363bc0d594c01705\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/eb80003744e32a7366a523015e4acfe0a2ac7d88\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-09-16T15:35:42Z",
      "cve": "CVE-2026-89785",
      "id": "CVE-2026-89785",
      "initial_release_date": "2026-09-16T15:35:42Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89785",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89785.json",
      "version": "2"
    }
  }
}



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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.

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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.


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