CVE-2024-26769Network attack vector

Remote service hang via nested workqueue flush

Published Apr 3, 2024 · Updated Aug 5, 2026

Deadlock in the Linux kernel NVMe-over-Fibre-Channel target allows remote attackers to hang NVMe target services via FC-NVMe traffic. During association deletion, fcloop_targetport_delete() calls flush_work() from the work item being flushed, permanently deadlocking the shared nvmet_wq. The pre-authentication create or disconnect handshake is sufficient, and the resulting workqueue hang blocks all NVMe target transports until reboot.

CVSS severity7.5
High
EPSS probability0.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deadlock in the Linux kernel NVMe-over-Fibre-Channel target allows remote attackers to hang NVMe target services via FC-NVMe traffic. During association deletion, fcloop_targetport_delete() calls flush_work() from the work item being flushed, permanently deadlocking the shared nvmet_wq. The pre-authentication create or disconnect handshake is sufficient, and the resulting workqueue hang blocks all NVMe target transports until reboot.

The record

CVE
CVE-2024-26769
Published
Apr 3, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 3, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=4.8
  2. Affected versionversion=a07b4970f464f13640e28e16dad6cfa33647cc99 <1d86f79287206deec36d63b89c741cf542b6cadd
  3. Affected versionversion=a07b4970f464f13640e28e16dad6cfa33647cc99 <5e0bc09a52b6169ce90f7ac6e195791adb16cec4
  4. Affected versionversion=a07b4970f464f13640e28e16dad6cfa33647cc99 <710c69dbaccdac312e32931abcb8499c1525d397
  5. Affected versionversion=a07b4970f464f13640e28e16dad6cfa33647cc99 <9e6987f8937a7bd7516aa52f25cb7e12c0c92ee8
  6. Affected versionversion=a07b4970f464f13640e28e16dad6cfa33647cc99 <eaf0971fdabf2a93c1429dc6bedf3bbe85dffa30

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.8; version=a07b4970f464f13640e28e16dad6cfa33647cc99 <1d86f79287206deec36d63b89c741cf542b6cadd; version=a07b4970f464f13640e28e16dad6cfa33647cc99 <5e0bc09a52b6169ce90f7ac6e195791adb16cec4; version=a07b4970f464f13640e28e16dad6cfa33647cc99 <710c69dbaccdac312e32931abcb8499c1525d397; version=a07b4970f464f13640e28e16dad6cfa33647cc99 <9e6987f8937a7bd7516aa52f25cb7e12c0c92ee8; version=a07b4970f464f13640e28e16dad6cfa33647cc99 <eaf0971fdabf2a93c1429dc6bedf3bbe85dffa30

Published CVSS scores

4.4CISA-ADPCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
7.5Linux kernel CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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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