CVE-2023-54117

Kernel crash via stale dcssblk xarray entries

Published Dec 24, 2025 · Updated Dec 24, 2025

Denial of service in the Linux kernel dcssblk driver allows attackers to crash s390 systems via repeated device add and remove cycles. Missing dax_remove_host calls leave stale gendisk pointers in an xarray, and a reused pointer drives dax_add_host into an error path with an unmatched put_device. The flaw requires the s390 dcssblk driver and device lifecycle operations; no remote trigger or privilege boundary is published.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux kernel dcssblk driver allows attackers to crash s390 systems via repeated device add and remove cycles. Missing dax_remove_host calls leave stale gendisk pointers in an xarray, and a reused pointer drives dax_add_host into an error path with an unmatched put_device. The flaw requires the s390 dcssblk driver and device lifecycle operations; no remote trigger or privilege boundary is published.

The record

CVE
CVE-2023-54117
Published
Dec 24, 2025
Updated
Dec 24, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Dec 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 24, 2025Record 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=5.17
  2. Affected versionversion=fb08a1908cb119a4585611d91461ab6d27756b14 <6489ec0107860345bc57dcde39e63dfb05ac5c11
  3. Affected versionversion=fb08a1908cb119a4585611d91461ab6d27756b14 <b5c531a9a7d8e047c90c909f09cef06a9f8e62f4
  4. Affected versionversion=fb08a1908cb119a4585611d91461ab6d27756b14 <b7ad75c77349beb4983b9f27108d9b3f33ae1413
  5. Affected versionversion=fb08a1908cb119a4585611d91461ab6d27756b14 <c8f40a0bccefd613748d080147469a4652d6e74c

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=5.17; version=fb08a1908cb119a4585611d91461ab6d27756b14 <6489ec0107860345bc57dcde39e63dfb05ac5c11; version=fb08a1908cb119a4585611d91461ab6d27756b14 <b5c531a9a7d8e047c90c909f09cef06a9f8e62f4; version=fb08a1908cb119a4585611d91461ab6d27756b14 <b7ad75c77349beb4983b9f27108d9b3f33ae1413; version=fb08a1908cb119a4585611d91461ab6d27756b14 <c8f40a0bccefd613748d080147469a4652d6e74c

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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application 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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