CVE-2026-98390Hinoki check available

Kernel crash via zero topology divisor

Published Oct 14, 2026 · Updated Oct 14, 2026

Division by zero in Linux 6.18 x86 AMD node initialization allows attackers to crash the kernel via inconsistent virtual topology. The amd_smn_init function divides the root count by the node count, then uses the unchecked zero result as a modulo divisor. The crash occurs during initialization on Xen PVH dom0 with two nodes and one root; attacker control of this topology is not documented.

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

What happened

Division by zero in Linux 6.18 x86 AMD node initialization allows attackers to crash the kernel via inconsistent virtual topology. The amd_smn_init function divides the root count by the node count, then uses the unchecked zero result as a modulo divisor. The crash occurs during initialization on Xen PVH dom0 with two nodes and one root; attacker control of this topology is not documented.

The record

CVE
CVE-2026-98390
Published
Oct 14, 2026
Updated
Oct 14, 2026
Vendor
The Linux Kernel Organization
Product
Linux
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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0a4b61d9c2e496b5f0a10e29e355a1465c8738bb <72bd92bd8190d7869ecb462649ca40f297822a33
  2. Affected versionversion=0a4b61d9c2e496b5f0a10e29e355a1465c8738bb <9273a90465d58b82aca4bea71451ef6bee084928
  3. Affected versionversion=0a4b61d9c2e496b5f0a10e29e355a1465c8738bb <94e984d8858a3228952b02f84e66610961098cc2
  4. Affected versionversion=6.17.8 <6.18
  5. Affected versionversion=6.18
  6. Affected versionversion=c4ad899a33198ab6335732c769835d035e66894a

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=0a4b61d9c2e496b5f0a10e29e355a1465c8738bb <72bd92bd8190d7869ecb462649ca40f297822a33; version=0a4b61d9c2e496b5f0a10e29e355a1465c8738bb <9273a90465d58b82aca4bea71451ef6bee084928; version=0a4b61d9c2e496b5f0a10e29e355a1465c8738bb <94e984d8858a3228952b02f84e66610961098cc2; version=6.17.8 <6.18; version=6.18; version=c4ad899a33198ab6335732c769835d035e66894a

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.

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

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.

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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