CVE-2026-90200Hinoki check available

Mount failure via overflowing MFT cluster validation

Published Sep 17, 2026 · Updated Sep 17, 2026

Integer overflow in Linux NTFS3 allows local users to cause mount failure via crafted MFT cluster numbers in an NTFS boot sector. In ntfs_init_from_boot(), unchecked 64-bit multiplication wraps attacker-controlled cluster numbers into sector positions that pass volume-size validation. Exposure requires mounting the crafted volume with NTFS3; subsequent block-layer overflow checks reject the reads, resulting in mount failure rather than a demonstrated kernel crash or code execution.

CVSS severity3.3
Low
EPSS probability0.22%
Next 30 days · Oct 18, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Integer overflow in Linux NTFS3 allows local users to cause mount failure via crafted MFT cluster numbers in an NTFS boot sector. In ntfs_init_from_boot(), unchecked 64-bit multiplication wraps attacker-controlled cluster numbers into sector positions that pass volume-size validation. Exposure requires mounting the crafted volume with NTFS3; subsequent block-layer overflow checks reject the reads, resulting in mount failure rather than a demonstrated kernel crash or code execution.

The record

CVE
CVE-2026-90200
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.15
  2. Affected versionversion=82cae269cfa953032fbb8980a7d554d60fb00b17 <169383d8914b8fe03464a83540b5b6de3e7831af
  3. Affected versionversion=82cae269cfa953032fbb8980a7d554d60fb00b17 <805cc5554b13d045dce9b03c13eaf015418739fd
  4. Affected versionversion=82cae269cfa953032fbb8980a7d554d60fb00b17 <c510c63873103a5da6a498fe537bdb5d6f8d03a2
  5. Affected versionversion=82cae269cfa953032fbb8980a7d554d60fb00b17 <dc6d85de7e2656e56e10ff5ba514f2583a4f612b
  6. Affected versionversion=82cae269cfa953032fbb8980a7d554d60fb00b17 <f77a8d9fdf58e298b36564a44c27fadc617bdd28

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.15; version=82cae269cfa953032fbb8980a7d554d60fb00b17 <169383d8914b8fe03464a83540b5b6de3e7831af; version=82cae269cfa953032fbb8980a7d554d60fb00b17 <805cc5554b13d045dce9b03c13eaf015418739fd; version=82cae269cfa953032fbb8980a7d554d60fb00b17 <c510c63873103a5da6a498fe537bdb5d6f8d03a2; version=82cae269cfa953032fbb8980a7d554d60fb00b17 <dc6d85de7e2656e56e10ff5ba514f2583a4f612b; version=82cae269cfa953032fbb8980a7d554d60fb00b17 <f77a8d9fdf58e298b36564a44c27fadc617bdd28

Published CVSS scores

3.3Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
3.3SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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