CVE-2026-90199

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-90199", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.792Z", "datePublished": "2026-09-17T16:07:17.550Z", "dateUpdated": "2026-10-19T08:59:35.489Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:59:35.489Z"}, "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 > 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]"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ntfs3/record.c"], "versions": [{"version": "013ff63b649475f0ee134e2c8d0c8e65284ede50", "lessThan": "0441e34ce098c19185a7b52c5b8b89a8a5b26888", "status": "affected", "versionType": "git"}, {"version": "013ff63b649475f0ee134e2c8d0c8e65284ede50", "lessThan": "7ab69cef49ebdfee288287d62641b24ab1445ecc", "status": "affected", "versionType": "git"}, {"version": "013ff63b649475f0ee134e2c8d0c8e65284ede50", "lessThan": "ce9a619c432b9a4044fee115c5483fbed946c131", "status": "affected", "versionType": "git"}, {"version": "013ff63b649475f0ee134e2c8d0c8e65284ede50", "lessThan": "2b9a0e57bfd365e2096706b19ae34dce3b4a884b", "status": "affected", "versionType": "git"}, {"version": "013ff63b649475f0ee134e2c8d0c8e65284ede50", "lessThan": "20fd9f64c0050658f2031e6bd5d552c6f0c8f7e3", "status": "affected", "versionType": "git"}, {"version": "a7accf181a4709a6e380360372150cc4a1b6b89a", "status": "affected", "versionType": "git"}, {"version": "3dfd727873c3e8da74a2e3907120ff052c5f0bcc", "status": "affected", "versionType": "git"}, {"version": "1d7dd485108d4f633b543c9c14071cc325b68ae5", "status": "affected", "versionType": "git"}, {"version": "5.15.209", "lessThan": "5.16", "status": "affected", "versionType": "semver"}, {"version": "6.1.115", "lessThan": "6.2", "status": "affected", "versionType": "semver"}, {"version": "6.5.11", "lessThan": "6.6", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ntfs3/record.c"], "versions": [{"version": "6.6", "status": "affected"}, {"version": "0", "lessThan": "6.6", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.52", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.6", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.6.157"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.12.110"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.18.52"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "7.2.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "7.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.209"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.115"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5.11"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/0441e34ce098c19185a7b52c5b8b89a8a5b26888"}, {"url": "https://git.kernel.org/stable/c/7ab69cef49ebdfee288287d62641b24ab1445ecc"}, {"url": "https://git.kernel.org/stable/c/ce9a619c432b9a4044fee115c5483fbed946c131"}, {"url": "https://git.kernel.org/stable/c/2b9a0e57bfd365e2096706b19ae34dce3b4a884b"}, {"url": "https://git.kernel.org/stable/c/20fd9f64c0050658f2031e6bd5d552c6f0c8f7e3"}], "title": "fs/ntfs3: reject out-of-range evcn in mi_enum_attr()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/ntfs3/record.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "0441e34ce098c19185a7b52c5b8b89a8a5b26888", "status": "affected", "version": "013ff63b649475f0ee134e2c8d0c8e65284ede50", "versionType": "git"}, {"lessThan": "7ab69cef49ebdfee288287d62641b24ab1445ecc", "status": "affected", "version": "013ff63b649475f0ee134e2c8d0c8e65284ede50", "versionType": "git"}, {"lessThan": "ce9a619c432b9a4044fee115c5483fbed946c131", "status": "affected", "version": "013ff63b649475f0ee134e2c8d0c8e65284ede50", "versionType": "git"}, {"lessThan": "2b9a0e57bfd365e2096706b19ae34dce3b4a884b", "status": "affected", "version": "013ff63b649475f0ee134e2c8d0c8e65284ede50", "versionType": "git"}, {"lessThan": "20fd9f64c0050658f2031e6bd5d552c6f0c8f7e3", "status": "affected", "version": "013ff63b649475f0ee134e2c8d0c8e65284ede50", "versionType": "git"}, {"status": "affected", "version": "a7accf181a4709a6e380360372150cc4a1b6b89a", "versionType": "git"}, {"status": "affected", "version": "3dfd727873c3e8da74a2e3907120ff052c5f0bcc", "versionType": "git"}, {"status": "affected", "version": "1d7dd485108d4f633b543c9c14071cc325b68ae5", "versionType": "git"}, {"lessThan": "5.16", "status": "affected", "version": "5.15.209", "versionType": "semver"}, {"lessThan": "6.2", "status": "affected", "version": "6.1.115", "versionType": "semver"}, {"lessThan": "6.6", "status": "affected", "version": "6.5.11", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/ntfs3/record.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.6"}, {"lessThan": "6.6", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.157", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.110", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.52", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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 > 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]"}], "id": "CVE-2026-90199", "lastModified": "2026-10-19T09:19:09.927", "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"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/20fd9f64c0050658f2031e6bd5d552c6f0c8f7e3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2b9a0e57bfd365e2096706b19ae34dce3b4a884b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7ab69cef49ebdfee288287d62641b24ab1445ecc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ce9a619c432b9a4044fee115c5483fbed946c131"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[013ff63b649475f0ee134e2c8d0c8e65284ede50,0441e34ce098c19185a7b52c5b8b89a8a5b26888)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[013ff63b649475f0ee134e2c8d0c8e65284ede50,7ab69cef49ebdfee288287d62641b8ab1445ecc)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[013ff63b649475f0ee134e2c8d0c8e65284ede50,ce9a619c432b9a4044fee115c5483fbed946c131)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[013ff63b649475f0ee134e2c8d0c8e65284ede50,2b9a0e57bfd365e2096706b19ae34dce3b4a884b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[013ff63b649475f0ee134e2c8d0c8e65284ede50,20fd9f64c0050658f2031e6bd5d552c6f0c8f7e3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "a7accf181a4709a6e380360372150cc4a1b6b89a"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "3dfd727873c3e8da74a2e3907120ff052c5f0bcc"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "1d7dd485108d4f633b543c9c14071cc325b68ae5"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.15.209,5.16)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.1.115,6.2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.5.11,6.6)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "6.6"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.6)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.157,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.110,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.52,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.6,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "7.3-rc1"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-19T08:30:16.786585+00:00", "updated": "2026-09-20T01:45:17.017948+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-190", "CWE-20"]}