CVE-2025-71204Network attack vector

Remote resource exhaustion via leaked durable references

Published Feb 14, 2026 · Updated Feb 14, 2026

Improper reference counting in Linux Kernel ksmbd allows remote attackers to exhaust resources through crafted SMB2 reconnect requests. parse_durable_handle_context() obtains a ksmbd_file reference but returns -ENOEXEC on a non-replay GUID mismatch without calling ksmbd_put_durable_fd(). Exposure requires a network-reachable ksmbd SMB server with durable handles in use; repeated unauthenticated requests consume references and impair availability.

CVSS severity7.5
High
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

Improper reference counting in Linux Kernel ksmbd allows remote attackers to exhaust resources through crafted SMB2 reconnect requests. parse_durable_handle_context() obtains a ksmbd_file reference but returns -ENOEXEC on a non-replay GUID mismatch without calling ksmbd_put_durable_fd(). Exposure requires a network-reachable ksmbd SMB server with durable handles in use; repeated unauthenticated requests consume references and impair availability.

The record

CVE
CVE-2025-71204
Published
Feb 14, 2026
Updated
Feb 14, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 14, 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 <07df5ff4f6490a5c96715b7c562e0b2908422e04
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3296c3012a9d9a27e81e34910384e55a6ff3cff0
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <70dd3513ed6ac8c6cab23f72c5b19f44ca89de9d
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8a15107c4c031fb19737bf2eb4000f847f1d5e4c

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <07df5ff4f6490a5c96715b7c562e0b2908422e04; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3296c3012a9d9a27e81e34910384e55a6ff3cff0; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <70dd3513ed6ac8c6cab23f72c5b19f44ca89de9d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8a15107c4c031fb19737bf2eb4000f847f1d5e4c

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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 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

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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