CVE-2025-39973

Unspecified impact via unchecked VF ring lengths

Published Oct 15, 2025 · Updated Oct 15, 2025

Improper input validation in the Linux i40e PF driver allows local users to cause unspecified impact via crafted VF queue messages. The queue-configuration path copies each VF-supplied ring_len directly into the hardware memory context without checking the 8K-minus-32 limit or Tx/Rx alignment. Reaching the path outside standard iavf checks requires CAP_SYS_MODULE or CAP_SYS_ADMIN in the initial user namespace; the upstream notice does not specify the resulting failure mode.

CVSS severity8.8
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in the Linux i40e PF driver allows local users to cause unspecified impact via crafted VF queue messages. The queue-configuration path copies each VF-supplied ring_len directly into the hardware memory context without checking the 8K-minus-32 limit or Tx/Rx alignment. Reaching the path outside standard iavf checks requires CAP_SYS_MODULE or CAP_SYS_ADMIN in the initial user namespace; the upstream notice does not specify the resulting failure mode.

The record

CVE
CVE-2025-39973
Published
Oct 15, 2025
Updated
Oct 15, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Oct 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 15, 2025Record 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=3.12
  2. Affected versionversion=5c3c48ac6bf56367c4e89f6453cd2d61e50375bd <0543d40d6513cdf1c7882811086e59a6455dfe97
  3. Affected versionversion=5c3c48ac6bf56367c4e89f6453cd2d61e50375bd <05fe81fb9db20464fa532a3835dc8300d68a2f84
  4. Affected versionversion=5c3c48ac6bf56367c4e89f6453cd2d61e50375bd <45a7527cd7da4cdcf3b06b5c0cb1cae30b5a5985
  5. Affected versionversion=5c3c48ac6bf56367c4e89f6453cd2d61e50375bd <55d225670def06b01af2e7a5e0446fbe946289e8
  6. Affected versionversion=5c3c48ac6bf56367c4e89f6453cd2d61e50375bd <7d749e38dd2b7e8a80da2ca30c93e09de95bfcf9
  7. Affected versionversion=5c3c48ac6bf56367c4e89f6453cd2d61e50375bd <afec12adab55d10708179a64d95d650741e60fe0
  8. Affected versionversion=5c3c48ac6bf56367c4e89f6453cd2d61e50375bd <c0c83f4cd074b75cecef107bfc349be7d516c9c4
  9. Affected versionversion=5c3c48ac6bf56367c4e89f6453cd2d61e50375bd <d3b0d3f8d11fa957171fbb186e53998361a88d4e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=3.12; version=5c3c48ac6bf56367c4e89f6453cd2d61e50375bd <0543d40d6513cdf1c7882811086e59a6455dfe97; version=5c3c48ac6bf56367c4e89f6453cd2d61e50375bd <05fe81fb9db20464fa532a3835dc8300d68a2f84; version=5c3c48ac6bf56367c4e89f6453cd2d61e50375bd <45a7527cd7da4cdcf3b06b5c0cb1cae30b5a5985; version=5c3c48ac6bf56367c4e89f6453cd2d61e50375bd <55d225670def06b01af2e7a5e0446fbe946289e8; version=5c3c48ac6bf56367c4e89f6453cd2d61e50375bd <7d749e38dd2b7e8a80da2ca30c93e09de95bfcf9; version=5c3c48ac6bf56367c4e89f6453cd2d61e50375bd <afec12adab55d10708179a64d95d650741e60fe0; version=5c3c48ac6bf56367c4e89f6453cd2d61e50375bd <c0c83f4cd074b75cecef107bfc349be7d516c9c4; version=5c3c48ac6bf56367c4e89f6453cd2d61e50375bd <d3b0d3f8d11fa957171fbb186e53998361a88d4e

Published CVSS scores

6.7Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
8.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/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)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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