CVE-2026-72207 (GCVE-0-2026-72207)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:54 – Updated: 2026-08-18 06:56
VLAI
Title
ntfs: not change 0-byte $DATA attribute to non-resident
Summary
In the Linux kernel, the following vulnerability has been resolved: ntfs: not change 0-byte $DATA attribute to non-resident When ntfs_resident_attr_resize() cannot grow a resident attribute in place, it retries after converting other resident attributes to non-resident to free space in the MFT recrord. Do not select zero-length resident $DATA attributes for this conversion. fsck treats 0-byte non-resident $DATA attribute as corruptions.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 495e90fa334828d4119061e2726af51d0a0fb4ed , < ceb49c37250125d418410988f2376ed4d57a6706 (git)
Affected: 495e90fa334828d4119061e2726af51d0a0fb4ed , < 0aad21570197973af4a1b25b3fb8ed3aeb9e7670 (git)
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Linux Linux Affected: 7.1
Unaffected: 0 , < 7.1 (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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      "affected": [
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          "product": "Linux",
          "programFiles": [
            "fs/ntfs/attrib.c"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: not change 0-byte $DATA attribute to non-resident\n\nWhen ntfs_resident_attr_resize() cannot grow a resident attribute in\nplace, it retries after converting other resident attributes to\nnon-resident to free space in the MFT recrord.\n\nDo not select zero-length resident $DATA attributes for this conversion.\nfsck treats 0-byte non-resident $DATA attribute as corruptions."
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            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - ntfs_resident_attr_resize() is reached from VFS write/truncate/fallocate paths (ntfs_attr_expand, __ntfs_attr_truncate_vfs); fs/ntfs registers ntfs_export_ops, so remote NFS or ksmbd clients writing to an exported rw NTFS share can trigger the corrupting conversion without local shell access.\nAC:L - An attacker can deterministically pack an MFT record with a resident 0-byte $DATA attribute plus other resident attributes, then grow a different resident attribute to force -ENOSPC and select that $DATA for conversion; no races or victim-specific memory layout are required.\nPR:N - Exploitation requires only permission to write or truncate files on a mounted NTFS volume (local user with directory write access, authenticated SMB/NFS client, or guest/anonymous write on a misconfigured export); mounting is environmental setup, not a privilege needed during the trigger.\nUI:N - Once an administrator has rw-mounted and optionally exported the NTFS volume (or automounted dual-boot/shared storage), the attacker drives write/truncate operations that exhaust MFT record space; no further victim clicks, opens, or cooperative actions are required beyond that standing configuration.\nS:U - Impact is confined to on-disk NTFS $DATA metadata corruption and subsequent filesystem operation failure within the host kernel/filesystem security authority; this is standard local or network filesystem exploitation, not a VM escape or cross-authority sandbox breakout.\nC:H - Converting a 0-byte resident $DATA to non-resident writes structurally invalid on-disk metadata that ntfsck/fsck treat as corruption; subsequent attribute lookups and data reads on the affected inode parse attacker-influenced corrupt non-resident layout and may read beyond intended attribute bounds.\nI:H - The bug persistently corrupts MFT $DATA records by creating invalid 0-byte non-resident attributes, enabling attacker-steerable on-disk metadata modification beyond the intended filesystem state that repair tools flag as corruption and that can render affected files or volumes inconsistent across OSes.\nA:H - Corrupt 0-byte non-resident $DATA attributes cause fsck/ntfsck failures and can leave affected files or volumes unusable on remount or when accessed from Windows or Linux; persistent on-disk corruption that blocks reliable filesystem access scores Availability High."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-18T06:56:27.219Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/ceb49c37250125d418410988f2376ed4d57a6706"
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        {
          "url": "https://git.kernel.org/stable/c/0aad21570197973af4a1b25b3fb8ed3aeb9e7670"
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      "title": "ntfs: not change 0-byte $DATA attribute to non-resident",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72207",
    "datePublished": "2026-08-15T05:54:03.281Z",
    "dateReserved": "2026-08-09T03:40:39.912Z",
    "dateUpdated": "2026-08-18T06:56:27.219Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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      "date": "2026-08-25",
      "epss": "0.00516",
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    "redhat_vex": {
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      "current_release_date": "2026-08-18T16:28:43+00:00",
      "cve": "CVE-2026-72207",
      "id": "CVE-2026-72207",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ntfs: not change 0-byte $DATA attribute to non-resident",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72207.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-21T00:42:33Z",
      "cve": "CVE-2026-72207",
      "id": "CVE-2026-72207",
      "initial_release_date": "2026-08-21T00:42:33Z",
      "product_status:known_not_affected": "284",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-72207",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-72207.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.

Sightings

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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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