CVE-2026-90401 Linux Kernel md - Data Integrity & Availability Impact

Linux kernel md subsystem removes REQ_NOWAIT support from raid1, raid10, and raid456 due to incomplete handling causing potential data divergence on write failures, letting attackers cause data inconsistency, exploit requires ability to trigger writes on affected RAID levels.

CVSS base score 7.1 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.15% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Data Integrity
Impact
Data Tampering, Denial Of Service
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Published
17 September 2026
Updated
15 October 2026

Vendor fix

Update to a Linux kernel version that removes REQ_NOWAIT support from raid1, raid10, and raid456.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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