CVE-2026-90199 (GCVE-0-2026-90199)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:07 – Updated: 2026-09-18 17:53
VLAI
Title
fs/ntfs3: reject out-of-range evcn in mi_enum_attr()
Summary
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 check]
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 013ff63b649475f0ee134e2c8d0c8e65284ede50 , < 0441e34ce098c19185a7b52c5b8b89a8a5b26888 (git)
Affected: 013ff63b649475f0ee134e2c8d0c8e65284ede50 , < 7ab69cef49ebdfee288287d62641b24ab1445ecc (git)
Affected: 013ff63b649475f0ee134e2c8d0c8e65284ede50 , < ce9a619c432b9a4044fee115c5483fbed946c131 (git)
Affected: 013ff63b649475f0ee134e2c8d0c8e65284ede50 , < 2b9a0e57bfd365e2096706b19ae34dce3b4a884b (git)
Affected: 013ff63b649475f0ee134e2c8d0c8e65284ede50 , < 20fd9f64c0050658f2031e6bd5d552c6f0c8f7e3 (git)
Affected: a7accf181a4709a6e380360372150cc4a1b6b89a (git)
Affected: 3dfd727873c3e8da74a2e3907120ff052c5f0bcc (git)
Affected: 1d7dd485108d4f633b543c9c14071cc325b68ae5 (git)
Affected: 5.15.209 , < 5.16 (semver)
Affected: 6.1.115 , < 6.2 (semver)
Affected: 6.5.11 , < 6.6 (semver)
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Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (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)
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: reject out-of-range evcn in mi_enum_attr()\n\nIn mi_enum_attr(), the start/end VCN validation for non-resident\nattributes is:\n\n\tif (svcn \u003e evcn + 1) goto out;\n\nWhen evcn is U64_MAX the \"evcn + 1\" expression wraps to 0 and any svcn\npasses the check. For evcn values close to U64_MAX (but not equal to it)\nthe right-hand side is still a meaningless near-wrap upper bound, so a\nmalformed on-disk attribute with svcn == 0 and evcn near U64_MAX can pass\nmi_enum_attr() unrejected.\n\nVCN (virtual cluster number) is a cluster index, so any valid evcn is\nbounded by the volume\u0027s total cluster count, which ntfs3 holds in\nsbi-\u003eused.bitmap.nbits (set up in ntfs_init_from_boot() before any caller\nof mi_enum_attr() runs). Reject evcn values that fall outside this range.\n\nHowever, an empty non-resident attribute (no allocated clusters) is\nlegitimately encoded with svcn == 0 and evcn == -1 (U64_MAX), e.g. via\nattr-\u003enres.evcn = cpu_to_le64((u64)vcn - 1) with vcn == 0. That sentinel\nmust keep passing, so exclude evcn == U64_MAX from the range check. The\nexisting \"svcn \u003e evcn + 1\" test still tolerates the sentinel (\"0 \u003e 0\" is\nfalse) and continues to require svcn == 0 for it, while the range check\nrejects every other out-of-range evcn and thereby also defuses the\n\"evcn + 1\" wraparound.\n\nsvcn does not need its own bound: once evcn \u003c nbits, \"svcn \u003e evcn + 1\"\nimplies svcn \u003c= nbits.\n\n[almaz.alexandrovich@paragon-software.com: fixed evcn check]"
        }
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "lang": "en",
              "value": "AV:L - The malformed field is attr-\u003enres.evcn (with svcn) in a non-resident MFT attribute on the block device. It is parsed by mount(2) \u2192 ntfs_fill_super() \u2192 ntfs_iget5() \u2192 ntfs_read_mft() \u2192 ni_enum_attr_ex() \u2192 mi_enum_attr(); no network protocol carries those VCN fields.\nAC:L - The attacker sets on-disk evcn \u2265 sbi-\u003eused.bitmap.nbits or near U64_MAX with svcn==0 so mi_enum_attr()\u0027s u64 test `svcn \u003e evcn + 1` never fails (evcn+1 wraps only at U64_MAX). A single sparse mapping pair of length evcn+1 then makes run_unpack() succeed; there is no race.\nPR:N - Crafting the NTFS image requires no account on the target. ntfs_fs_type has no FS_USERNS_MOUNT, so the CAP_SYS_ADMIN mount is the victim\u0027s action and is counted as UI:R rather than attacker privilege.\nUI:R - A victim must mount the attacker-supplied NTFS volume so ntfs_fill_super()/ntfs_read_mft() will run mi_enum_attr() on the crafted evcn; that mount is the required user action.\nS:U - Corruption stays in the host kernel\u0027s ntfs3 runs_tree and MFT record buffers; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Accepted evcn near U32_MAX is passed to run_unpack_ex() and installed as a sparse run of length ~U32_MAX. A later write hits run_add_entry(), which splits that run with wrapping CLST adds (r-\u003evcn+r-\u003elen, tail_len=r-\u003elen-Tovcn), so lookups return wrong LCNs and can read past the kvmalloc\u0027d runs array.\nI:H - The same wrapping split does `r-\u003elen += len - ((r-\u003evcn + r-\u003elen) - vcn)` and run_consolidate() joins on wrapped end points; mi_pack_runs() then writes the corrupted mapping pairs into the kmalloc\u0027d MFT record \u2014 a kernel-heap write of attacker-influenced run metadata.\nA:H - Walking off the runs array on the wrapped split, or submitting an iomap bio from a wrapped LCN in ntfs_iomap_begin() after attr_data_get_block(), oopses the kernel; attr_set_size_ex() also takes _ntfs_bad_inode() on the inconsistent vcn/evcn state."
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/20fd9f64c0050658f2031e6bd5d552c6f0c8f7e3"
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      "title": "fs/ntfs3: reject out-of-range evcn in mi_enum_attr()",
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    "datePublished": "2026-09-17T16:07:17.550Z",
    "dateReserved": "2026-09-11T19:38:34.792Z",
    "dateUpdated": "2026-09-18T17:53:40.108Z",
    "state": "PUBLISHED"
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: reject out-of-range evcn in mi_enum_attr()\n\nIn mi_enum_attr(), the start/end VCN validation for non-resident\nattributes is:\n\n\tif (svcn \u003e evcn + 1) goto out;\n\nWhen evcn is U64_MAX the \"evcn + 1\" expression wraps to 0 and any svcn\npasses the check. For evcn values close to U64_MAX (but not equal to it)\nthe right-hand side is still a meaningless near-wrap upper bound, so a\nmalformed on-disk attribute with svcn == 0 and evcn near U64_MAX can pass\nmi_enum_attr() unrejected.\n\nVCN (virtual cluster number) is a cluster index, so any valid evcn is\nbounded by the volume\u0027s total cluster count, which ntfs3 holds in\nsbi-\u003eused.bitmap.nbits (set up in ntfs_init_from_boot() before any caller\nof mi_enum_attr() runs). Reject evcn values that fall outside this range.\n\nHowever, an empty non-resident attribute (no allocated clusters) is\nlegitimately encoded with svcn == 0 and evcn == -1 (U64_MAX), e.g. via\nattr-\u003enres.evcn = cpu_to_le64((u64)vcn - 1) with vcn == 0. That sentinel\nmust keep passing, so exclude evcn == U64_MAX from the range check. The\nexisting \"svcn \u003e evcn + 1\" test still tolerates the sentinel (\"0 \u003e 0\" is\nfalse) and continues to require svcn == 0 for it, while the range check\nrejects every other out-of-range evcn and thereby also defuses the\n\"evcn + 1\" wraparound.\n\nsvcn does not need its own bound: once evcn \u003c nbits, \"svcn \u003e evcn + 1\"\nimplies svcn \u003c= nbits.\n\n[almaz.alexandrovich@paragon-software.com: fixed evcn check]"
          }
        ],
        "id": "CVE-2026-90199",
        "lastModified": "2026-09-18T18:17:45.950",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "REQUIRED",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-09-17T17:17:14.790",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/0441e34ce098c19185a7b52c5b8b89a8a5b26888"
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            "url": "https://git.kernel.org/stable/c/20fd9f64c0050658f2031e6bd5d552c6f0c8f7e3"
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          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/ce9a619c432b9a4044fee115c5483fbed946c131"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-21T16:30:56Z",
      "cve": "CVE-2026-90199",
      "id": "CVE-2026-90199",
      "initial_release_date": "2026-09-18T00:20:02Z",
      "product_status:known_affected": "108",
      "product_status:known_not_affected": "239",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-90199",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-90199.json",
      "version": "4"
    }
  }
}



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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

Author Source Type Date Other

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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.