{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-90199",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-90199"
  ],
  "published": "2026-09-17T16:10:40Z",
  "summary": "fs/ntfs3: reject out-of-range evcn in mi_enum_attr()",
  "details": "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 > 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's total cluster count, which ntfs3 holds in\nsbi->used.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->nres.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 > evcn + 1\" test still tolerates the sentinel (\"0 > 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 < nbits, \"svcn > evcn + 1\"\nimplies svcn <= nbits.\n\n[almaz.alexandrovich@paragon-software.com: fixed evcn check]",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-90199"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0441e34ce098c19185a7b52c5b8b89a8a5b26888"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7ab69cef49ebdfee288287d62641b24ab1445ecc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ce9a619c432b9a4044fee115c5483fbed946c131"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2b9a0e57bfd365e2096706b19ae34dce3b4a884b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/20fd9f64c0050658f2031e6bd5d552c6f0c8f7e3"
    }
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-18T17:55:42Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The malformed field is attr->nres.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->used.bitmap.nbits or near U64_MAX with svcn==0 so mi_enum_attr()'s u64 test `svcn > 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's 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's 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->vcn+r->len, tail_len=r->len-Tovcn), so lookups return wrong LCNs and can read past the kvmalloc'd runs array.\nI:H - The same wrapping split does `r->len += len - ((r->vcn + r->len) - vcn)` and run_consolidate() joins on wrapped end points; mi_pack_runs() then writes the corrupted mapping pairs into the kmalloc'd 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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}