CVE-2026-90400Hinoki check available

Kernel crash via unsuspended spare-reconfiguration race

Published Sep 17, 2026 · Updated Sep 17, 2026

A race in the Linux 6.7 md driver allows local users to crash the kernel via spare replacement concurrent with RAID10 writes. md_start_sync() checks device state before acquiring reconfig_mutex, allowing stale results to authorize device replacement without suspending ongoing I/O. The documented race requires an md array undergoing spare changes during writes and reaches a NULL pointer in rdev_dec_pending(); attacker control over that timing is not documented.

CVSS severity4.7
Medium
EPSS probability0.17%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

A race in the Linux 6.7 md driver allows local users to crash the kernel via spare replacement concurrent with RAID10 writes. md_start_sync() checks device state before acquiring reconfig_mutex, allowing stale results to authorize device replacement without suspending ongoing I/O. The documented race requires an md array undergoing spare changes during writes and reaches a NULL pointer in rdev_dec_pending(); attacker control over that timing is not documented.

The record

CVE
CVE-2026-90400
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
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=6.7
  2. Affected versionversion=bc08041b32abe6c9824f78735bac22018eabfc06 <81b39df5d701976cf20e52f33106c1fc1603b4cb
  3. Affected versionversion=bc08041b32abe6c9824f78735bac22018eabfc06 <c3777d16bc3335c0ac4bdad0551c80d38c5d94cc
  4. Affected versionversion=bc08041b32abe6c9824f78735bac22018eabfc06 <c7d34d17ea43ebc86b45d439ebb435e11ca44bca
  5. Affected versionversion=bc08041b32abe6c9824f78735bac22018eabfc06 <e5ac7ab78467b064f1da8b0f3042a63595fafcfd

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.7; version=bc08041b32abe6c9824f78735bac22018eabfc06 <81b39df5d701976cf20e52f33106c1fc1603b4cb; version=bc08041b32abe6c9824f78735bac22018eabfc06 <c3777d16bc3335c0ac4bdad0551c80d38c5d94cc; version=bc08041b32abe6c9824f78735bac22018eabfc06 <c7d34d17ea43ebc86b45d439ebb435e11ca44bca; version=bc08041b32abe6c9824f78735bac22018eabfc06 <e5ac7ab78467b064f1da8b0f3042a63595fafcfd

Published CVSS scores

4.7Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

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

T1499.004Application or System Exploitation

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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