CVE-2026-90185Hinoki check available

Out-of-bounds access via unlocked configfs attribute stores

Published Sep 17, 2026 · Updated Sep 17, 2026

A race in Linux null_blk allows local users to trigger out-of-bounds kernel access via concurrent configfs attribute writes. NULLB_DEVICE_ATTR stores update fields without a shared lock, allowing zone_nr_conv to exceed its validated limit during power_store device setup and index beyond dev->zones[]. Access requires write permission to null_blk configfs attributes and concurrent stores through separate file descriptors; queue reconfiguration also leaves inconsistent state.

CVSS severity4.7
Medium
EPSS probability0.21%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

A race in Linux null_blk allows local users to trigger out-of-bounds kernel access via concurrent configfs attribute writes. NULLB_DEVICE_ATTR stores update fields without a shared lock, allowing zone_nr_conv to exceed its validated limit during power_store device setup and index beyond dev->zones[]. Access requires write permission to null_blk configfs attributes and concurrent stores through separate file descriptors; queue reconfiguration also leaves inconsistent state.

The record

CVE
CVE-2026-90185
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

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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=45919fbfe1c487c17ea1d198534339a5e8abeae3 <3945ce8cbce4e328e6fdf0b522dc71e340de19db
  2. Affected versionversion=45919fbfe1c487c17ea1d198534339a5e8abeae3 <65cae82fd3c39b53430672cb9e3ecd267471a6ce
  3. Affected versionversion=45919fbfe1c487c17ea1d198534339a5e8abeae3 <7e7fff51808237703a3a1df6dd5cae1dfd1db86d
  4. Affected versionversion=45919fbfe1c487c17ea1d198534339a5e8abeae3 <88d806d0e1d36246208386a8e55b511c1b3d647c
  5. Affected versionversion=45919fbfe1c487c17ea1d198534339a5e8abeae3 <8e839ed5210399a0330a8a6c5885c1d40a537c6d
  6. Affected versionversion=45919fbfe1c487c17ea1d198534339a5e8abeae3 <c70994c2862b05e44728912b2ea9487d31e2aea7
  7. Affected versionversion=5.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=45919fbfe1c487c17ea1d198534339a5e8abeae3 <3945ce8cbce4e328e6fdf0b522dc71e340de19db; version=45919fbfe1c487c17ea1d198534339a5e8abeae3 <65cae82fd3c39b53430672cb9e3ecd267471a6ce; version=45919fbfe1c487c17ea1d198534339a5e8abeae3 <7e7fff51808237703a3a1df6dd5cae1dfd1db86d; version=45919fbfe1c487c17ea1d198534339a5e8abeae3 <88d806d0e1d36246208386a8e55b511c1b3d647c; version=45919fbfe1c487c17ea1d198534339a5e8abeae3 <8e839ed5210399a0330a8a6c5885c1d40a537c6d; version=45919fbfe1c487c17ea1d198534339a5e8abeae3 <c70994c2862b05e44728912b2ea9487d31e2aea7; version=5.5

Published CVSS scores

5.5TenableCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.7Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H
2.6Tenable Nessus plugin 347704AV:L/AC:H/Au:N/C:N/I:P/A:P
4.7Tenable Nessus plugin 347704CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
3.3TenableAV:L/AC:M/Au:N/C:N/I:P/A:P

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.

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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 exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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