CVE-2026-90275

I/O hang via uncleared RAID1 takeover flag

Published Sep 17, 2026 · Updated Sep 17, 2026

Denial of service in Linux md/raid1 allows local users to hang array I/O by triggering a RAID1 takeover on an affected kernel. The raid1_takeover() function sets array_frozen on the new configuration, but the resume path no longer clears it, leaving _wait_barrier() blocking indefinitely. Reachability requires array-reconfiguration access; the reported consequence is a permanent I/O stall on the taken-over array.

CVSS severity4.4
Medium
EPSS probability0.17%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux md/raid1 allows local users to hang array I/O by triggering a RAID1 takeover on an affected kernel. The raid1_takeover() function sets array_frozen on the new configuration, but the resume path no longer clears it, leaving _wait_barrier() blocking indefinitely. Reachability requires array-reconfiguration access; the reported consequence is a permanent I/O stall on the taken-over array.

The record

CVE
CVE-2026-90275
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=6.6
  2. Affected versionversion=b39f35ebe86d88788d85f61e83c81c308cb76727 <668d99ba47210ab6ceb18f1cf022c0accca7e3bb
  3. Affected versionversion=b39f35ebe86d88788d85f61e83c81c308cb76727 <b6ec4bf1ec4446c0213c08ea493e48e6b83cd1af
  4. Affected versionversion=b39f35ebe86d88788d85f61e83c81c308cb76727 <c57ec2749ee03cace564eec7bb37c89dc3d8d47b
  5. Affected versionversion=b39f35ebe86d88788d85f61e83c81c308cb76727 <dc386aa0ac0a3ec06c9a3ea9b064b073fb72a916
  6. Affected versionversion=b39f35ebe86d88788d85f61e83c81c308cb76727 <f9cdb5bb8efbf401e84d850828271af87e6be2dc

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.6; version=b39f35ebe86d88788d85f61e83c81c308cb76727 <668d99ba47210ab6ceb18f1cf022c0accca7e3bb; version=b39f35ebe86d88788d85f61e83c81c308cb76727 <b6ec4bf1ec4446c0213c08ea493e48e6b83cd1af; version=b39f35ebe86d88788d85f61e83c81c308cb76727 <c57ec2749ee03cace564eec7bb37c89dc3d8d47b; version=b39f35ebe86d88788d85f61e83c81c308cb76727 <dc386aa0ac0a3ec06c9a3ea9b064b073fb72a916; version=b39f35ebe86d88788d85f61e83c81c308cb76727 <f9cdb5bb8efbf401e84d850828271af87e6be2dc

Published CVSS scores

6.8SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
4.4Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
5.5SUSECVSS:3.1/AV:L/AC:L/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.

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Technologies

Your stack

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