CVE-2026-90200— fs/ntfs3: fix integer overflow in MFT cluster validation
Quick assessment
Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
在 Linux 内核中，已修复以下漏洞： fs/ntfs3：修复 MFT 簇验证中的整数溢出问题 在 函数中，启动扇区的 MFT 簇编号会与卷大小进行验证，代码如下： 其中 和 是从启动扇区直接读取的 u64 字段。 的上限为 4096（由 及其下方的 检查所限定）。然而，乘法运算在 u64 下进行，当 （或 ）的值足够大时（例如 接近 2^62 且 ），乘法结果会发生回绕（wrap around）——例如回绕为 0，这将小于任何非零的 ，从而绕过了检查，导致格式错误的记录被接受。 被接受的 随后未经验证地用于以下
Possible ATT&CK Techniques 1 AI
T1565 · Data ManipulationAffected Version Matrix 12
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 82cae269cfa953032fbb8980a7d554d60fb00b17< f77a8d9fdf58e298b36564a44c27fadc617bdd28 |
affected |
82cae269cfa953032fbb8980a7d554d60fb00b17< 805cc5554b13d045dce9b03c13eaf015418739fd |
affected | ||
82cae269cfa953032fbb8980a7d554d60fb00b17< dc6d85de7e2656e56e10ff5ba514f2583a4f612b |
affected | ||
82cae269cfa953032fbb8980a7d554d60fb00b17< 169383d8914b8fe03464a83540b5b6de3e7831af |
affected | ||
82cae269cfa953032fbb8980a7d554d60fb00b17< c510c63873103a5da6a498fe537bdb5d6f8d03a2 |
affected | ||
5.15 |
affected | ||
< 5.15 |
unaffected | ||
6.6.157≤ 6.6.* |
unaffected | ||
| … +4 more rows | |||
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I. Basic Information for CVE-2026-90200
Vulnerability Information
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Vulnerability Title
fs/ntfs3: fix integer overflow in MFT cluster validation
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
fs/ntfs3: fix integer overflow in MFT cluster validation
In ntfs_init_from_boot(), the boot sector's MFT cluster numbers are
validated against the volume size with:
if (mlcn * sct_per_clst >= sectors ||
mlcn2 * sct_per_clst >= sectors)
goto out;
mlcn and mlcn2 are u64 fields read directly from the boot sector.
sct_per_clst is bounded above by 4096 (true_sectors_per_clst() plus
the is_power_of_2() check below it), but the multiplication is done
in u64 and wraps when mlcn (or mlcn2) is large enough -- e.g. mlcn
near 2^62 with sct_per_clst == 4 wraps to 0, which compares below
any non-zero 'sectors', so the check is bypassed and the malformed
record is accepted.
The accepted mlcn is then used unchanged in
sbi->mft.lbo = mlcn << cluster_bits;
In practice the resulting reads fail at the block layer (sb_bread()
returns NULL via grow_buffers()'s check_mul_overflow() guard), so
today this manifests as mount failing in odd places rather than as
something more dangerous, but the validation step is still wrong
and there is no reason for callers to rely on the block layer to
catch a value that should never have been accepted in the first
place.
Use check_mul_overflow() to compute the two sector positions and
fail the mount if either multiplication wraps; this preserves the
existing semantics (mlcn * sct_per_clst >= sectors) instead of
switching to division (mlcn >= sectors / sct_per_clst), which
would tighten the check at edge cases where 'sectors' is not a
multiple of sct_per_clst. The check_*_overflow() style is the
one ntfs3 already uses for similar on-disk arithmetic in
fs/ntfs3/run.c.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-90200
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-90200 (5)
Same Patch Batch · Linux · 2026-09-17 · 600 CVEs total
| CVE-2026-90235 | 9.8 CRITICAL | sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE |
| CVE-2026-90104 | 9.8 CRITICAL | NFSv4.1: zero referring call lists before decoding |
| CVE-2026-90173 | 9.8 CRITICAL | smb: smbdirect: free completion queues with ib_free_cq() |
| CVE-2026-92489 | 9.8 CRITICAL | xfrm: Fix skb double-free in xfrm_dev_direct_output() |
| CVE-2026-90151 | 9.8 CRITICAL | NFSv4: remove callback IDR entry on client allocation failure |
| CVE-2026-90110 | 9.4 CRITICAL | inetpeer: randomize RB-tree node comparison using SipHash |
| CVE-2026-90230 | 9.1 CRITICAL | nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate() |
| CVE-2026-90414 | 9.1 CRITICAL | IB/isert: reject PDUs declaring more data than was received |
| CVE-2026-90413 | 9.1 CRITICAL | IB/isert: reject login PDUs declaring more data than was received |
| CVE-2026-90380 | 8.8 HIGH | wifi: mt76: mt792x: fix use-after-free in mt76_rx_poll_complete |
| CVE-2026-93042 | 8.8 HIGH | dmaengine: dw-edma: Terminate all descriptors without callbacks |
| CVE-2026-90425 | 8.8 HIGH | iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID |
| CVE-2026-90240 | 8.8 HIGH | iommu/vt-d: Flush context cache with correct SID when tearing down aliases |
| CVE-2026-90381 | 8.8 HIGH | wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx() |
| CVE-2026-90329 | 8.8 HIGH | HID: synchronize input before cleaning up a failed probe |
| CVE-2026-90357 | 8.8 HIGH | wifi: mt76: mt7915: unlink TWT flow if the MCU rejects the agreement |
| CVE-2026-90379 | 8.8 HIGH | wifi: mt76: mt7921: Add PCIe AER handler support to prevent system crash |
| CVE-2026-90162 | 8.8 HIGH | ksmbd: defer publishing granted locks to prevent UAF/double-free race |
| CVE-2026-93189 | 8.8 HIGH | HID: core: quiesce input in hid_hw_stop() to prevent use-after-free |
| CVE-2026-90255 | 8.8 HIGH | Bluetooth: hci_conn: fix the SCO setup context lifetime |
Showing top 20 of 600 CVEs. View all on vendor page → →
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V. Comments for CVE-2026-90200
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