CVE-2025-38264Network attack vector

Host hang via cyclic NVMe/TCP request list

Published Jul 9, 2025 · Updated Aug 5, 2026

Denial of service in the Linux NVMe/TCP host driver allows remote attackers controlling a storage target to hang the host with a malicious R2T PDU. nvme_tcp_handle_r2t() accepts a duplicate request already linked on a send list, allowing two R2T PDUs for one command to create a cyclic request list. The host must be connected to a malicious or compromised NVMe-over-TCP target; duplicate queueing can wedge storage processing and expose kernel pages.

CVSS severity9.8
Critical
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux NVMe/TCP host driver allows remote attackers controlling a storage target to hang the host with a malicious R2T PDU. nvme_tcp_handle_r2t() accepts a duplicate request already linked on a send list, allowing two R2T PDUs for one command to create a cyclic request list. The host must be connected to a malicious or compromised NVMe-over-TCP target; duplicate queueing can wedge storage processing and expose kernel pages.

The record

CVE
CVE-2025-38264
Published
Jul 9, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-672, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 9, 2025CVE 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

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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=3f2304f8c6d6ed97849057bd16fee99e434ca796 <0bf04c874fcb1ae46a863034296e4b33d8fbd66c
  2. Affected versionversion=3f2304f8c6d6ed97849057bd16fee99e434ca796 <78a4adcd3fedb0728436e8094848ebf4c6bae006
  3. Affected versionversion=3f2304f8c6d6ed97849057bd16fee99e434ca796 <f054ea62598197714a6ca7b3b387a027308f8b13
  4. Affected versionversion=5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3f2304f8c6d6ed97849057bd16fee99e434ca796 <0bf04c874fcb1ae46a863034296e4b33d8fbd66c; version=3f2304f8c6d6ed97849057bd16fee99e434ca796 <78a4adcd3fedb0728436e8094848ebf4c6bae006; version=3f2304f8c6d6ed97849057bd16fee99e434ca796 <f054ea62598197714a6ca7b3b387a027308f8b13; version=5.0

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.1Red HatCVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
9.8Linux kernel CVE teamCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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

CWE-672Operation on a Resource after Expiration or Release
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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