CVE-2026-89457

Local kernel panic via DASD sysfs race

Published Sep 11, 2026 · Updated Sep 11, 2026

NULL pointer dereference in Linux allows local users to panic the kernel by reading a world-readable s390 DASD sysfs attribute. During dasd_generic_set_online(), the driver assigns the discipline before check_device() allocates device->private, while several show/store callbacks dereference that pointer without a NULL guard. The race requires local access to a matching s390 DASD sysfs attribute during device online setup, and successful exploitation crashes the host rather than exposing or modifying data.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Linux allows local users to panic the kernel by reading a world-readable s390 DASD sysfs attribute. During dasd_generic_set_online(), the driver assigns the discipline before check_device() allocates device->private, while several show/store callbacks dereference that pointer without a NULL guard. The race requires local access to a matching s390 DASD sysfs attribute during device online setup, and successful exploitation crashes the host rather than exposing or modifying data.

The record

CVE
CVE-2026-89457
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 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=5.3
  2. Affected versionversion=c729696bcf8b23450043dd9c9972c15e53419ae4 <2a1780f9fc2493bd34c418a0be6fc58943afcecf
  3. Affected versionversion=c729696bcf8b23450043dd9c9972c15e53419ae4 <449f3bada7a9fad8b8cdf4bb20baf27ee9ca56c5
  4. Affected versionversion=c729696bcf8b23450043dd9c9972c15e53419ae4 <536407b272402af679155910d7fdeeb4834eefb9
  5. Affected versionversion=c729696bcf8b23450043dd9c9972c15e53419ae4 <6452c13646af7c13d7f6668b6690cfb2427e7f7b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.3; version=c729696bcf8b23450043dd9c9972c15e53419ae4 <2a1780f9fc2493bd34c418a0be6fc58943afcecf; version=c729696bcf8b23450043dd9c9972c15e53419ae4 <449f3bada7a9fad8b8cdf4bb20baf27ee9ca56c5; version=c729696bcf8b23450043dd9c9972c15e53419ae4 <536407b272402af679155910d7fdeeb4834eefb9; version=c729696bcf8b23450043dd9c9972c15e53419ae4 <6452c13646af7c13d7f6668b6690cfb2427e7f7b

Published CVSS scores

No CVSS assessment is available in this record.

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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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Your stack

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