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fs/ntfs3: reject out-of-range evcn in mi_enum_attr()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: reject out-of-range evcn in mi_enum_attr() In mi_enum_attr(), the start/end VCN validation for non-resident attributes is: if (svcn > evcn + 1) goto out; When evcn is U64_MAX the "evcn + 1" expression wraps to 0 and any svcn passes the check. For evcn values close to U64_MAX (but not equal to it) the right-hand side is still a meaningless near-wrap upper bound, so a malformed on-disk attribute with svcn == 0 and evcn near U64_MAX can pass mi_enum_attr() unrejected. VCN (virtual cluster number) is a cluster index, so any valid evcn is bounded by the volume's total cluster count, which ntfs3 holds in sbi->used.bitmap.nbits (set up in ntfs_init_from_boot() before any caller of mi_enum_attr() runs). Reject evcn values that fall outside this range. However, an empty non-resident attribute (no allocated clusters) is legitimately encoded with svcn == 0 and evcn == -1 (U64_MAX), e.g. via attr->nres.evcn = cpu_to_le64((u64)vcn - 1) with vcn == 0. That sentinel must keep passing, so exclude evcn == U64_MAX from the range check. The existing "svcn > evcn + 1" test still tolerates the sentinel ("0 > 0" is false) and continues to require svcn == 0 for it, while the range check rejects every other out-of-range evcn and thereby also defuses the "evcn + 1" wraparound. svcn does not need its own bound: once evcn < nbits, "svcn > evcn + 1" implies svcn <= nbits. [almaz.alexandrovich@paragon-software.com: fixed evcn c

Announced Source revision 1
Original source ↗

CVE-2026-90199

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-2026-90199

Linux

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

Affected versions
Not stated in this record
Fixed versions
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Prerequisites
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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": "013ff63b649475f0ee134e2c8d0c8e65284ede50",
        "lessThan": "0441e34ce098c19185a7b52c5b8b89a8a5b26888",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "013ff63b649475f0ee134e2c8d0c8e65284ede50",
        "lessThan": "7ab69cef49ebdfee288287d62641b24ab1445ecc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "013ff63b649475f0ee134e2c8d0c8e65284ede50",
        "lessThan": "ce9a619c432b9a4044fee115c5483fbed946c131",
        "versionType": "git"
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      {
        "status": "affected",
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        "versionType": "git"
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      {
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        "lessThan": "20fd9f64c0050658f2031e6bd5d552c6f0c8f7e3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a7accf181a4709a6e380360372150cc4a1b6b89a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3dfd727873c3e8da74a2e3907120ff052c5f0bcc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1d7dd485108d4f633b543c9c14071cc325b68ae5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5.15.209",
        "lessThan": "5.16",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.1.115",
        "lessThan": "6.2",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.5.11",
        "lessThan": "6.6",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "fs/ntfs3/record.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.6"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.6",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.52",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/ntfs3/record.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-90199

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#36576 · Revision 1
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Publisher date
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