CVE-2026-89962

Crash or memory corruption via truncated kexec ranges

Published Sep 16, 2026 · Updated Sep 16, 2026

Memory-range truncation in Linux 5.9 and affected later commits allows attackers to corrupt active memory or crash a powerpc system during kdump. The __merge_memory_ranges function compares each range with the prior array element rather than the active merged range, then replaces the merged end without retaining the larger boundary. The condition requires a powerpc kexec_file/kdump path with nested overlapping ranges; public sources establish no unprivileged trigger.

CVSS severityUnavailable
Unscored
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory-range truncation in Linux 5.9 and affected later commits allows attackers to corrupt active memory or crash a powerpc system during kdump. The __merge_memory_ranges function compares each range with the prior array element rather than the active merged range, then replaces the merged end without retaining the larger boundary. The condition requires a powerpc kexec_file/kdump path with nested overlapping ranges; public sources establish no unprivileged trigger.

The record

CVE
CVE-2026-89962
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=180adfc532a83c1d74146449f7385f767d4b8059 <9ef63622e6cee588ea4b763a6afc87065254b36a
  2. Affected versionversion=180adfc532a83c1d74146449f7385f767d4b8059 <c4cb547f26d9b73b489c5278d0c8db837c5a174f
  3. Affected versionversion=180adfc532a83c1d74146449f7385f767d4b8059 <da88a2a2119e4fd0e8919a7a2448682f574e1545
  4. Affected versionversion=180adfc532a83c1d74146449f7385f767d4b8059 <fa40f9dbdd4af53e7445d9135b5b207eb8adf372
  5. Affected versionversion=5.9

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=180adfc532a83c1d74146449f7385f767d4b8059 <9ef63622e6cee588ea4b763a6afc87065254b36a; version=180adfc532a83c1d74146449f7385f767d4b8059 <c4cb547f26d9b73b489c5278d0c8db837c5a174f; version=180adfc532a83c1d74146449f7385f767d4b8059 <da88a2a2119e4fd0e8919a7a2448682f574e1545; version=180adfc532a83c1d74146449f7385f767d4b8059 <fa40f9dbdd4af53e7445d9135b5b207eb8adf372; version=5.9

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.

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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.

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Technologies

Your stack

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Your stack

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