{"api_version":"1","generated_at":"2026-09-25T07:54:28+00:00","cve":"CVE-2026-90200","urls":{"html":"https://cve.report/CVE-2026-90200","api":"https://cve.report/api/cve/CVE-2026-90200.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-90200","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-90200"},"summary":{"title":"fs/ntfs3: fix integer overflow in MFT cluster validation","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: fix integer overflow in MFT cluster validation\n\nIn ntfs_init_from_boot(), the boot sector's MFT cluster numbers are\nvalidated against the volume size with:\n\n\tif (mlcn  * sct_per_clst >= sectors ||\n\t    mlcn2 * sct_per_clst >= sectors)\n\t\tgoto out;\n\nmlcn and mlcn2 are u64 fields read directly from the boot sector.\nsct_per_clst is bounded above by 4096 (true_sectors_per_clst() plus\nthe is_power_of_2() check below it), but the multiplication is done\nin u64 and wraps when mlcn (or mlcn2) is large enough -- e.g. mlcn\nnear 2^62 with sct_per_clst == 4 wraps to 0, which compares below\nany non-zero 'sectors', so the check is bypassed and the malformed\nrecord is accepted.\n\nThe accepted mlcn is then used unchanged in\n\n\tsbi->mft.lbo = mlcn << cluster_bits;\n\nIn practice the resulting reads fail at the block layer (sb_bread()\nreturns NULL via grow_buffers()'s check_mul_overflow() guard), so\ntoday this manifests as mount failing in odd places rather than as\nsomething more dangerous, but the validation step is still wrong\nand there is no reason for callers to rely on the block layer to\ncatch a value that should never have been accepted in the first\nplace.\n\nUse check_mul_overflow() to compute the two sector positions and\nfail the mount if either multiplication wraps; this preserves the\nexisting semantics (mlcn * sct_per_clst >= sectors) instead of\nswitching to division (mlcn >= sectors / sct_per_clst), which\nwould tighten the check at edge cases where 'sectors' is not a\nmultiple of sct_per_clst.  The check_*_overflow() style is the\none ntfs3 already uses for similar on-disk arithmetic in\nfs/ntfs3/run.c.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-17 17:17:14","updated_at":"2026-09-17 17:17:14"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/169383d8914b8fe03464a83540b5b6de3e7831af","name":"https://git.kernel.org/stable/c/169383d8914b8fe03464a83540b5b6de3e7831af","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f77a8d9fdf58e298b36564a44c27fadc617bdd28","name":"https://git.kernel.org/stable/c/f77a8d9fdf58e298b36564a44c27fadc617bdd28","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/dc6d85de7e2656e56e10ff5ba514f2583a4f612b","name":"https://git.kernel.org/stable/c/dc6d85de7e2656e56e10ff5ba514f2583a4f612b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/805cc5554b13d045dce9b03c13eaf015418739fd","name":"https://git.kernel.org/stable/c/805cc5554b13d045dce9b03c13eaf015418739fd","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c510c63873103a5da6a498fe537bdb5d6f8d03a2","name":"https://git.kernel.org/stable/c/c510c63873103a5da6a498fe537bdb5d6f8d03a2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-90200","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90200","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 82cae269cfa953032fbb8980a7d554d60fb00b17 f77a8d9fdf58e298b36564a44c27fadc617bdd28 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 82cae269cfa953032fbb8980a7d554d60fb00b17 805cc5554b13d045dce9b03c13eaf015418739fd git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 82cae269cfa953032fbb8980a7d554d60fb00b17 dc6d85de7e2656e56e10ff5ba514f2583a4f612b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 82cae269cfa953032fbb8980a7d554d60fb00b17 169383d8914b8fe03464a83540b5b6de3e7831af git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 82cae269cfa953032fbb8980a7d554d60fb00b17 c510c63873103a5da6a498fe537bdb5d6f8d03a2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.15","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.157 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.110 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.52 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.6 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/ntfs3/super.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"f77a8d9fdf58e298b36564a44c27fadc617bdd28","status":"affected","version":"82cae269cfa953032fbb8980a7d554d60fb00b17","versionType":"git"},{"lessThan":"805cc5554b13d045dce9b03c13eaf015418739fd","status":"affected","version":"82cae269cfa953032fbb8980a7d554d60fb00b17","versionType":"git"},{"lessThan":"dc6d85de7e2656e56e10ff5ba514f2583a4f612b","status":"affected","version":"82cae269cfa953032fbb8980a7d554d60fb00b17","versionType":"git"},{"lessThan":"169383d8914b8fe03464a83540b5b6de3e7831af","status":"affected","version":"82cae269cfa953032fbb8980a7d554d60fb00b17","versionType":"git"},{"lessThan":"c510c63873103a5da6a498fe537bdb5d6f8d03a2","status":"affected","version":"82cae269cfa953032fbb8980a7d554d60fb00b17","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/ntfs3/super.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.15"},{"lessThan":"5.15","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-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.157","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.110","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.52","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.6","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"5.15","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: fix integer overflow in MFT cluster validation\n\nIn ntfs_init_from_boot(), the boot sector's MFT cluster numbers are\nvalidated against the volume size with:\n\n\tif (mlcn  * sct_per_clst >= sectors ||\n\t    mlcn2 * sct_per_clst >= sectors)\n\t\tgoto out;\n\nmlcn and mlcn2 are u64 fields read directly from the boot sector.\nsct_per_clst is bounded above by 4096 (true_sectors_per_clst() plus\nthe is_power_of_2() check below it), but the multiplication is done\nin u64 and wraps when mlcn (or mlcn2) is large enough -- e.g. mlcn\nnear 2^62 with sct_per_clst == 4 wraps to 0, which compares below\nany non-zero 'sectors', so the check is bypassed and the malformed\nrecord is accepted.\n\nThe accepted mlcn is then used unchanged in\n\n\tsbi->mft.lbo = mlcn << cluster_bits;\n\nIn practice the resulting reads fail at the block layer (sb_bread()\nreturns NULL via grow_buffers()'s check_mul_overflow() guard), so\ntoday this manifests as mount failing in odd places rather than as\nsomething more dangerous, but the validation step is still wrong\nand there is no reason for callers to rely on the block layer to\ncatch a value that should never have been accepted in the first\nplace.\n\nUse check_mul_overflow() to compute the two sector positions and\nfail the mount if either multiplication wraps; this preserves the\nexisting semantics (mlcn * sct_per_clst >= sectors) instead of\nswitching to division (mlcn >= sectors / sct_per_clst), which\nwould tighten the check at edge cases where 'sectors' is not a\nmultiple of sct_per_clst.  The check_*_overflow() style is the\none ntfs3 already uses for similar on-disk arithmetic in\nfs/ntfs3/run.c."}],"providerMetadata":{"dateUpdated":"2026-09-17T16:07:18.182Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/f77a8d9fdf58e298b36564a44c27fadc617bdd28"},{"url":"https://git.kernel.org/stable/c/805cc5554b13d045dce9b03c13eaf015418739fd"},{"url":"https://git.kernel.org/stable/c/dc6d85de7e2656e56e10ff5ba514f2583a4f612b"},{"url":"https://git.kernel.org/stable/c/169383d8914b8fe03464a83540b5b6de3e7831af"},{"url":"https://git.kernel.org/stable/c/c510c63873103a5da6a498fe537bdb5d6f8d03a2"}],"title":"fs/ntfs3: fix integer overflow in MFT cluster validation","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-90200","datePublished":"2026-09-17T16:07:18.182Z","dateReserved":"2026-09-11T19:38:34.792Z","dateUpdated":"2026-09-17T16:07:18.182Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-17 17:17:14","lastModifiedDate":"2026-09-17 17:17:14","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"90200","Ordinal":"1","Title":"fs/ntfs3: fix integer overflow in MFT cluster validation","CVE":"CVE-2026-90200","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"90200","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: fix integer overflow in MFT cluster validation\n\nIn ntfs_init_from_boot(), the boot sector's MFT cluster numbers are\nvalidated against the volume size with:\n\n\tif (mlcn  * sct_per_clst >= sectors ||\n\t    mlcn2 * sct_per_clst >= sectors)\n\t\tgoto out;\n\nmlcn and mlcn2 are u64 fields read directly from the boot sector.\nsct_per_clst is bounded above by 4096 (true_sectors_per_clst() plus\nthe is_power_of_2() check below it), but the multiplication is done\nin u64 and wraps when mlcn (or mlcn2) is large enough -- e.g. mlcn\nnear 2^62 with sct_per_clst == 4 wraps to 0, which compares below\nany non-zero 'sectors', so the check is bypassed and the malformed\nrecord is accepted.\n\nThe accepted mlcn is then used unchanged in\n\n\tsbi->mft.lbo = mlcn << cluster_bits;\n\nIn practice the resulting reads fail at the block layer (sb_bread()\nreturns NULL via grow_buffers()'s check_mul_overflow() guard), so\ntoday this manifests as mount failing in odd places rather than as\nsomething more dangerous, but the validation step is still wrong\nand there is no reason for callers to rely on the block layer to\ncatch a value that should never have been accepted in the first\nplace.\n\nUse check_mul_overflow() to compute the two sector positions and\nfail the mount if either multiplication wraps; this preserves the\nexisting semantics (mlcn * sct_per_clst >= sectors) instead of\nswitching to division (mlcn >= sectors / sct_per_clst), which\nwould tighten the check at edge cases where 'sectors' is not a\nmultiple of sct_per_clst.  The check_*_overflow() style is the\none ntfs3 already uses for similar on-disk arithmetic in\nfs/ntfs3/run.c.","Type":"Description","Title":"fs/ntfs3: fix integer overflow in MFT cluster validation"}]}}}