CVE-2026-90230Network attack vector

Kernel-memory disclosure or service interruption via unchecked lengths

Published Sep 17, 2026 · Updated Sep 18, 2026

Out-of-bounds read in the Linux NVMe target allows remote attackers to expose kernel memory or interrupt service via malformed authentication data. nvmet_auth_negotiate() trusts the host-supplied transfer length and halen/dhlen counts, then indexes a fixed 60-byte identifier array beyond the allocated message buffer. The path is reachable before authentication from an NVMe host that can connect to an exposed NVMe-oF target; the read can disclose adjacent heap data or interrupt the target service.

CVSS severity9.1
Critical
EPSS probability0.46%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in the Linux NVMe target allows remote attackers to expose kernel memory or interrupt service via malformed authentication data. nvmet_auth_negotiate() trusts the host-supplied transfer length and halen/dhlen counts, then indexes a fixed 60-byte identifier array beyond the allocated message buffer. The path is reachable before authentication from an NVMe host that can connect to an exposed NVMe-oF target; the read can disclose adjacent heap data or interrupt the target service.

The record

CVE
CVE-2026-90230
Published
Sep 17, 2026
Updated
Sep 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

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 <5bb96cc218835769ab74ec7f3ea2bf81fbffe955
  3. Affected versionversion=db1312dd95488b5e6ff362ff66fcf953a46b1821 <7b81e4d2230e3d2d372c826180c4ef0efc244f31
  4. Affected versionversion=db1312dd95488b5e6ff362ff66fcf953a46b1821 <89ff11b72f38976f3b5aea23a5228ee05e277209
  5. Affected versionversion=db1312dd95488b5e6ff362ff66fcf953a46b1821 <aaac783950b17c57df9b6f7344747cacb1a407ed
  6. Affected versionversion=db1312dd95488b5e6ff362ff66fcf953a46b1821 <c38a8186326799957d293d370136c128cd113916

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.0; version=db1312dd95488b5e6ff362ff66fcf953a46b1821 <5bb96cc218835769ab74ec7f3ea2bf81fbffe955; version=db1312dd95488b5e6ff362ff66fcf953a46b1821 <7b81e4d2230e3d2d372c826180c4ef0efc244f31; version=db1312dd95488b5e6ff362ff66fcf953a46b1821 <89ff11b72f38976f3b5aea23a5228ee05e277209; version=db1312dd95488b5e6ff362ff66fcf953a46b1821 <aaac783950b17c57df9b6f7344747cacb1a407ed; version=db1312dd95488b5e6ff362ff66fcf953a46b1821 <c38a8186326799957d293d370136c128cd113916

Published CVSS scores

9.1LinuxCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
5.3Amazon LinuxCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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

T1499Endpoint Denial of Service

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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