CVE-2026-98725Network attack vectorHinoki check available

Kernel crash via undersized authentication challenge buffer

Published Oct 18, 2026 · Updated Oct 18, 2026

An out-of-bounds write in Linux 6.0 NVMe target authentication allows remote attackers to crash the kernel via short AUTH_RECEIVE buffers. In nvmet_auth_challenge(), sizeof on a dereferenced void pointer undercounts the challenge header by 15 bytes, allowing the challenge copy to overrun the allocation. Reaching this stage requires an accessible NVMe target with in-band authentication support, before secret verification; the reported panic used KASAN with panic_on_warn enabled.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

An out-of-bounds write in Linux 6.0 NVMe target authentication allows remote attackers to crash the kernel via short AUTH_RECEIVE buffers. In nvmet_auth_challenge(), sizeof on a dereferenced void pointer undercounts the challenge header by 15 bytes, allowing the challenge copy to overrun the allocation. Reaching this stage requires an accessible NVMe target with in-band authentication support, before secret verification; the reported panic used KASAN with panic_on_warn enabled.

The record

CVE
CVE-2026-98725
Published
Oct 18, 2026
Updated
Oct 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 18, 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=6.0
  2. Affected versionversion=db1312dd95488b5e6ff362ff66fcf953a46b1821 <7fd3c363eba4f2aceb4b3f31cd1cf65e0dcbaee4
  3. Affected versionversion=db1312dd95488b5e6ff362ff66fcf953a46b1821 <8a9b4c0eef19c207663c1ee888257307c869ca86
  4. Affected versionversion=db1312dd95488b5e6ff362ff66fcf953a46b1821 <9d61131acd742cf97ee64e453383e41b46568513
  5. Affected versionversion=db1312dd95488b5e6ff362ff66fcf953a46b1821 <fa6778e030bed9841ddcdf96bc7018da9ac03562

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.0; version=db1312dd95488b5e6ff362ff66fcf953a46b1821 <7fd3c363eba4f2aceb4b3f31cd1cf65e0dcbaee4; version=db1312dd95488b5e6ff362ff66fcf953a46b1821 <8a9b4c0eef19c207663c1ee888257307c869ca86; version=db1312dd95488b5e6ff362ff66fcf953a46b1821 <9d61131acd742cf97ee64e453383e41b46568513; version=db1312dd95488b5e6ff362ff66fcf953a46b1821 <fa6778e030bed9841ddcdf96bc7018da9ac03562

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application 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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