CVE-2026-74386Network attack vector

Service interruption via undrained page-fragment cache

Published Aug 15, 2026 · Updated Aug 15, 2026

Resource leakage in the nvmet-tcp target in affected Linux kernels allows remote attackers to exhaust memory through failed queue setup. In nvmet_tcp_alloc_queue(), the out_ida_remove error path frees the queue without draining queue->pf_cache after nvmet_tcp_alloc_cmd() takes its first page-cache reference. A configured NVMe-over-TCP target and repeated connection failures are required, eventually depleting system memory and interrupting service.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource leakage in the nvmet-tcp target in affected Linux kernels allows remote attackers to exhaust memory through failed queue setup. In nvmet_tcp_alloc_queue(), the out_ida_remove error path frees the queue without draining queue->pf_cache after nvmet_tcp_alloc_cmd() takes its first page-cache reference. A configured NVMe-over-TCP target and repeated connection failures are required, eventually depleting system memory and interrupting service.

The record

CVE
CVE-2026-74386
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-911, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=5.0
  2. Affected versionversion=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <4dae393956093c807212918fd91a8fc70df15338
  3. Affected versionversion=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <5fbe83a374f09561a0f0c1f4aa021501ffd681eb
  4. Affected versionversion=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <a43a9abc1ebf663f0aa56a729106f68dd9c77da6
  5. Affected versionversion=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <ba3209704b3cd46961e4e081af5c52a780785648

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.0; version=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <4dae393956093c807212918fd91a8fc70df15338; version=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <5fbe83a374f09561a0f0c1f4aa021501ffd681eb; version=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <a43a9abc1ebf663f0aa56a729106f68dd9c77da6; version=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <ba3209704b3cd46961e4e081af5c52a780785648

Published CVSS scores

5.5Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.5Amazon LinuxCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.7SUSECVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
5.7SUSECVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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 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

CWE-911Improper Update of Reference Count
T1499.003Application Exhaustion Flood

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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