CVE-2026-90389Public exploitHinoki check available

Allocation-state corruption via cross-task token restoration

Published Sep 17, 2026 · Updated Sep 17, 2026

Linux 5.8 MD allocation-state corruption allows local users to retain incorrect memory flags via concurrent sysfs writes. The MD suspension paths store a task-specific memalloc_noio_save() token on the shared mddev, allowing another task to restore it and leaving the original task in PF_MEMALLOC_NOIO after returning to userspace. Triggering requires CAP_SYS_ADMIN and concurrent writes to suspend_lo and suspend_hi on an MD array; the published reproducer establishes incorrect allocation state, not a specific hang or crash.

CVSS severity1.8
Low
EPSS probability0.20%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Get started

Summary

What happened

Linux 5.8 MD allocation-state corruption allows local users to retain incorrect memory flags via concurrent sysfs writes. The MD suspension paths store a task-specific memalloc_noio_save() token on the shared mddev, allowing another task to restore it and leaving the original task in PF_MEMALLOC_NOIO after returning to userspace. Triggering requires CAP_SYS_ADMIN and concurrent writes to suspend_lo and suspend_hi on an MD array; the published reproducer establishes incorrect allocation state, not a specific hang or crash.

The record

CVE
CVE-2026-90389
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

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=5.8
  2. Affected versionversion=78f57ef9d50a75326da73d352d7c27828495229a <28fdea874f68cac6c36651b1fc7272fd2199c48d
  3. Affected versionversion=78f57ef9d50a75326da73d352d7c27828495229a <72ebfdf507ede7d7f2b7ca0a5634811a0e4bf045
  4. Affected versionversion=78f57ef9d50a75326da73d352d7c27828495229a <a58923756b0f8e71032070c23ae0b167e46731da
  5. Affected versionversion=78f57ef9d50a75326da73d352d7c27828495229a <bace2010dd7ac07bc980575afb135c406730a7fe

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=5.8; version=78f57ef9d50a75326da73d352d7c27828495229a <28fdea874f68cac6c36651b1fc7272fd2199c48d; version=78f57ef9d50a75326da73d352d7c27828495229a <72ebfdf507ede7d7f2b7ca0a5634811a0e4bf045; version=78f57ef9d50a75326da73d352d7c27828495229a <a58923756b0f8e71032070c23ae0b167e46731da; version=78f57ef9d50a75326da73d352d7c27828495229a <bace2010dd7ac07bc980575afb135c406730a7fe

Published CVSS scores

1.8SUSECVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
1.9Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L
1.9SUSECVSS:3.1/AV:L/AC:H/PR:H/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Get started to see how Hinoki identifies affected software and validates exploitability in your environment.

Get started