CVE-2026-31557Network attack vector

Service hang via reentrant workqueue flush

Published Apr 24, 2026 · Updated Apr 24, 2026

A workqueue deadlock in the Linux Kernel nvmet RDMA target allows remote attackers to interrupt NVMe target service during disconnect. nvmet_ctrl_free() flushes async_event_work while the RDMA queue-release worker already owns nvmet-wq, recursively waiting on the same worker pool. Reachability requires an NVMe-over-Fabrics RDMA target with queued asynchronous-event work when an RDMA connection disconnects; the resulting deadlock can hang target processing.

CVSS severity7.5
High
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A workqueue deadlock in the Linux Kernel nvmet RDMA target allows remote attackers to interrupt NVMe target service during disconnect. nvmet_ctrl_free() flushes async_event_work while the RDMA queue-release worker already owns nvmet-wq, recursively waiting on the same worker pool. Reachability requires an NVMe-over-Fabrics RDMA target with queued asynchronous-event work when an RDMA connection disconnects; the resulting deadlock can hang target processing.

The record

CVE
CVE-2026-31557
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <25ceffc1dabec3b93f458b437aae26f4da293f87
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2922e3507f6d5caa7f1d07f145e186fc6f317a4e
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <49c7c50ee6325a084216e94395e067ecde8088fa
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ca111c9d8d6c9d5735878d933a1716c4be86c2d1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <25ceffc1dabec3b93f458b437aae26f4da293f87; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2922e3507f6d5caa7f1d07f145e186fc6f317a4e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <49c7c50ee6325a084216e94395e067ecde8088fa; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ca111c9d8d6c9d5735878d933a1716c4be86c2d1

Published CVSS scores

7.5kernel.orgCVSS: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.

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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.

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Technologies

Your stack

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Your stack

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