Is there a patch available for CVE-2026-98400?

Yes, a patch is available for CVE-2026-98400. Update the affected software to the latest version immediately.

Linux CVE-2026-98400

EUVD-2026-101049

2026-10-14 Linux

GHSA-v8v9-cp6p-qm5r

Denial Of Service Linux

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Awaiting Data No severity or threat signals available yet. Label will update when CVSS score is published or threat intelligence arrives. Why: No CVSS yet + weak signal (CWE or non-zero EPSS).

Patch available 0.2% exploitation probability (EPSS)

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AnalysisCVE.org

In the Linux kernel, the following vulnerability has been resolved:

s390/ipl: Fix NULL deref in kdump without re-IPL parm block

Some IPL types, like HMC FTP boot or QEMU direct kernel boot, might not provide an IPL parameter block. In this case, reipl_type_init() selects IPL_TYPE_UNKNOWN, and reipl_block_actual remains NULL.

kdump passes the re-IPL parameter block to the dump kernel through os_info. Before commit 3b9678472bab ("s390/ipl: correct kdump reipl block checksum calculation"), the os_info entry was added only for IPL types which initialized reipl_block_actual. That commit moved the os_info update to machine_crash_shutdown(), making it unconditional. As a result, set_os_info_reipl_block() dereferences reipl_block_actual for IPL_TYPE_UNKNOWN. This may happen to work by chance when address zero contains readable lowcore data and the resulting empty os_info entry is ignored by the dump kernel.

Skip the os_info update when no re-IPL parameter block is available. Kdump then collect the dump and reboot without setting re-IPL parameter block.

Affected VersionsENISA

Linux 4.17

Linux 3b9678472bab86ae654cf2c18d5dd551558045be <b6bf82bc5e00afaf836f8bb9a676bffc182a6bbd

Linux patch: 6.6.158

Linux patch: 6.12.111

Linux 3b9678472bab86ae654cf2c18d5dd551558045be <50f9c40768e84f30d374235b3ee3850a94d9ac29

Linux patch: 6.18.53

Linux patch: 7.3-rc2

Linux 3b9678472bab86ae654cf2c18d5dd551558045be <7f918871112e8e7c581e99eb8e545af4e59c8367

Linux patch: 7.2.7

Linux 3b9678472bab86ae654cf2c18d5dd551558045be <92d0829eae257544b6b0faccb6e7079c45e22d48

Linux 3b9678472bab86ae654cf2c18d5dd551558045be <030e88812435fc5d6aa42eee41fa77b5ea620327

Linux patch: 0

Affected Packages

euvd linux no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

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Exploit and PoC references, threat intelligence from 22 sources

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Lifecycle Timeline

Patch available

Oct 14, 2026 - 15:03 EUVD

CVE Published

Oct 14, 2026 - 13:26 cve.org

UNKNOWN (no severity yet)

Threat Intelligence Overview

EPSS Score

0.2%

Top 90% exploitable

Data Quality

2 sources

Confidence: Low

EUVD

CVE.org

EPSS

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity Not scored yet

CISA KEV No

Public POC No

EPSS 0.2%

Patch available Yes

Active threat No

Deciding rule

No CVSS yet + weak signal (CWE or non-zero EPSS)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.