CVE-2026-98056Network attack vectorHinoki check available

Kernel soft lockup via sparse NVMe namespaces

Published Sep 25, 2026 · Updated Sep 25, 2026

Denial of service in the Linux NVMe host driver allows remote attackers controlling a target to cause a soft lockup during namespace scanning. The nvme_scan_ns_list() function iterates across every absent 32-bit NSID in each reported gap and calls nvme_find_get_ns() once per value instead of walking only namespaces that exist. Exploitation requires a connected NVMe target to report a sparse namespace list with a very large NSID gap; the resulting workqueue stall interrupts service on the host.

CVSS severityUnavailable
Unscored
EPSS probability0.60%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Denial of service in the Linux NVMe host driver allows remote attackers controlling a target to cause a soft lockup during namespace scanning. The nvme_scan_ns_list() function iterates across every absent 32-bit NSID in each reported gap and calls nvme_find_get_ns() once per value instead of walking only namespaces that exist. Exploitation requires a connected NVMe target to report a sparse namespace list with a very large NSID gap; the resulting workqueue stall interrupts service on the host.

The record

CVE
CVE-2026-98056
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 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=4.5
  2. Affected versionversion=540c801c65eb58e05e0ca38b6fd644a83d7e2b33 <4ed7f3d7d435bf5b63da2814dc9270f5ba896011
  3. Affected versionversion=540c801c65eb58e05e0ca38b6fd644a83d7e2b33 <52200fc41a79da430ccf7c126ed837535b087ea2
  4. Affected versionversion=540c801c65eb58e05e0ca38b6fd644a83d7e2b33 <c84ad7407fb16b92d9b7a649cc304a9cf3757897
  5. Affected versionversion=540c801c65eb58e05e0ca38b6fd644a83d7e2b33 <f56b2bb4b18b017b056c4c17c66b2c4c54bf6ee4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=4.5; version=540c801c65eb58e05e0ca38b6fd644a83d7e2b33 <4ed7f3d7d435bf5b63da2814dc9270f5ba896011; version=540c801c65eb58e05e0ca38b6fd644a83d7e2b33 <52200fc41a79da430ccf7c126ed837535b087ea2; version=540c801c65eb58e05e0ca38b6fd644a83d7e2b33 <c84ad7407fb16b92d9b7a649cc304a9cf3757897; version=540c801c65eb58e05e0ca38b6fd644a83d7e2b33 <f56b2bb4b18b017b056c4c17c66b2c4c54bf6ee4

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
PrivilegesUnavailable
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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