CVE-2026-64321Network attack vector

Remote service interruption via leaked ndev references

Published Jul 25, 2026 · Updated Jul 25, 2026

Resource exhaustion in Linux Kernel NVMe target RDMA allows remote attackers to interrupt service via repeated queue connections. The nvmet_rdma_queue_connect() path retains the ndev reference acquired by nvmet_rdma_find_get_device() when the host queue backlog returns NVME_SC_CONNECT_CTRL_BUSY. Reachability requires network access to a configured NVMe target RDMA endpoint and enough queue connections to enter the busy path, causing device references to accumulate and availability to degrade.

CVSS severity3.7
Low
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Linux Kernel NVMe target RDMA allows remote attackers to interrupt service via repeated queue connections. The nvmet_rdma_queue_connect() path retains the ndev reference acquired by nvmet_rdma_find_get_device() when the host queue backlog returns NVME_SC_CONNECT_CTRL_BUSY. Reachability requires network access to a configured NVMe target RDMA endpoint and enough queue connections to enter the busy path, causing device references to accumulate and availability to degrade.

The record

CVE
CVE-2026-64321
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 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?

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  1. Affected versionversion=31deaeb11ba7a885116c9c30892b9f763c04d59c <5828517d17eda27f21d29ea14800c9e0a57bad11
  2. Affected versionversion=31deaeb11ba7a885116c9c30892b9f763c04d59c <a8803c4f0ac3fa7df5551bbb5a8800c434a94357
  3. Affected versionversion=31deaeb11ba7a885116c9c30892b9f763c04d59c <badc53620fe813b3a9f727ef9526f98567c2c898
  4. Affected versionversion=31deaeb11ba7a885116c9c30892b9f763c04d59c <d65fe42820b890a6a4644de0a95a812471f79ad3
  5. Affected versionversion=6.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=31deaeb11ba7a885116c9c30892b9f763c04d59c <5828517d17eda27f21d29ea14800c9e0a57bad11; version=31deaeb11ba7a885116c9c30892b9f763c04d59c <a8803c4f0ac3fa7df5551bbb5a8800c434a94357; version=31deaeb11ba7a885116c9c30892b9f763c04d59c <badc53620fe813b3a9f727ef9526f98567c2c898; version=31deaeb11ba7a885116c9c30892b9f763c04d59c <d65fe42820b890a6a4644de0a95a812471f79ad3; version=6.8

Published CVSS scores

3.7Amazon LinuxCVSS:3.1/AV:N/AC:H/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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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