CVE-2026-98399

Post-dump halt via missing IPL parameter block

Published Oct 14, 2026 · Updated Oct 14, 2026

Linux Kernel s390 dump/re-IPL handling dereferences a missing IPL block, leaving the system halted after a stand-alone dump. In arch/s390/kernel/ipl.c, dump_reipl_run() reads reipl_block_actual->hdr.len without checking whether boot initialization left the pointer NULL. HMC FTP or QEMU direct kernel boot can omit the block; attacker control and required privileges are undocumented, and the post-dump halt also occurs with corrected handling.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Linux Kernel s390 dump/re-IPL handling dereferences a missing IPL block, leaving the system halted after a stand-alone dump. In arch/s390/kernel/ipl.c, dump_reipl_run() reads reipl_block_actual->hdr.len without checking whether boot initialization left the pointer NULL. HMC FTP or QEMU direct kernel boot can omit the block; attacker control and required privileges are undocumented, and the post-dump halt also occurs with corrected handling.

The record

CVE
CVE-2026-98399
Published
Oct 14, 2026
Updated
Oct 14, 2026
Vendor
Linux Foundation
Product
Linux Kernel
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 14, 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?

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  1. Affected versionversion=099b765139929efdcf232f8870804accf8c4cdc5 <280ff19853440d59e031cd8fe161e81305721262
  2. Affected versionversion=099b765139929efdcf232f8870804accf8c4cdc5 <37f61b71cbc0caefc01022a19ee56fc2510e2e6e
  3. Affected versionversion=099b765139929efdcf232f8870804accf8c4cdc5 <41647864e62b28388ecccc23a82f0e0a091f4ef2
  4. Affected versionversion=099b765139929efdcf232f8870804accf8c4cdc5 <8d7988e8116c3d29d9e02ca9d37ee84577643f2d
  5. Affected versionversion=099b765139929efdcf232f8870804accf8c4cdc5 <aed56fa3108b7095e6a048e134981506c056a6cb
  6. Affected versionversion=2.6.30

What conditions does exploitation require?

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

What is affected?

Linux Foundation · Linux Kernelversion=099b765139929efdcf232f8870804accf8c4cdc5 <280ff19853440d59e031cd8fe161e81305721262; version=099b765139929efdcf232f8870804accf8c4cdc5 <37f61b71cbc0caefc01022a19ee56fc2510e2e6e; version=099b765139929efdcf232f8870804accf8c4cdc5 <41647864e62b28388ecccc23a82f0e0a091f4ef2; version=099b765139929efdcf232f8870804accf8c4cdc5 <8d7988e8116c3d29d9e02ca9d37ee84577643f2d; version=099b765139929efdcf232f8870804accf8c4cdc5 <aed56fa3108b7095e6a048e134981506c056a6cb; version=2.6.30

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.

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)
VectorUnavailable
PrivilegesUnavailable
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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