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ntfs3: validate split-point offset in indx_insert_into_buffer

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: ntfs3: validate split-point offset in indx_insert_into_buffer indx_insert_into_buffer() computes used = used1 - to_copy - sp_size; memmove(de_t, Add2Ptr(sp, sp_size), used - le32_to_cpu(hdr1->de_off)); where sp and sp_size come from hdr_find_split(). hdr_find_split() walks entries by le16_to_cpu(e->size) without validating that each step stays within hdr->used or that the size field is at least sizeof(struct NTFS_DE). index_hdr_check(), the on-load gatekeeper, only validates header-level fields (used, total, de_off) and does not walk per-entry sizes. A crafted NTFS image whose leaf INDEX_HDR reports used == total but contains one interior NTFS_DE with size = 0xFFF0 therefore passes validation, descends to indx_insert_into_buffer() through the ntfs_create() -> indx_insert_entry() path, and makes hdr_find_split() return an sp whose sp_size (0xFFF0) greatly exceeds the remaining bytes in the buffer. The u32 subtraction underflows and the memmove count becomes a near-4-GiB value, producing an out-of-bounds kernel write that corrupts adjacent allocations and panics the kernel. Reproduced on 7.0.0-rc7 with UML + KASAN via a crafted image and a single 'touch' inside the mounted directory; crash site resolves to fs/ntfs3/index.c at the memmove. Trigger requires only local mount of an attacker-supplied filesystem image (USB, loopback, or removable media auto-mount). Reject the split whenever the chosen sp plus its dec

Announced Source revision 1
Original source ↗

CVE-2026-72191

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-72191

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "82cae269cfa953032fbb8980a7d554d60fb00b17",
        "lessThan": "8e4ba5a38c155bb3c1c11e63cd285b178cdb099e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "82cae269cfa953032fbb8980a7d554d60fb00b17",
        "lessThan": "4c2f648139a0a86f4486170f72e24fedd4fae74e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "82cae269cfa953032fbb8980a7d554d60fb00b17",
        "lessThan": "b232eb5c9fe11ec2368e9b565db69c724c35fbd2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "82cae269cfa953032fbb8980a7d554d60fb00b17",
        "lessThan": "7bf74e6baf810fe325f111996496c678fc6e244f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "82cae269cfa953032fbb8980a7d554d60fb00b17",
        "lessThan": "f3624cc069195001c88df7a291af215f2133ff2c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "82cae269cfa953032fbb8980a7d554d60fb00b17",
        "lessThan": "1758a564b6ebe7f4a82f23c9851d1cae15549457",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "82cae269cfa953032fbb8980a7d554d60fb00b17",
        "lessThan": "f1df9d771df47aa40de6d70949c28720ae1e430d",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "fs/ntfs3/index.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.15"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.15",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.217",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.184",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.145",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.97",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.40",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.5",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/ntfs3/index.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-72191

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#32968 · Revision 1
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Publisher date
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