CVE-2025-38200

Service interruption via i40e interrupt-count underflow

Published Jul 4, 2025 · Updated Jun 11, 2026

Integer underflow in the Linux kernel i40e driver allows local users to interrupt service through device-supplied input. In i40e_clear_hw, unsigned interrupt-count and loop variables wrap below zero, causing the resulting index to direct an MMIO write to an invalid page. A low-privileged local user and an i40e device capable of returning the specific input are required; the published impact is availability only.

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

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Summary

What happened

Integer underflow in the Linux kernel i40e driver allows local users to interrupt service through device-supplied input. In i40e_clear_hw, unsigned interrupt-count and loop variables wrap below zero, causing the resulting index to direct an MMIO write to an invalid page. A low-privileged local user and an i40e device capable of returning the specific input are required; the published impact is availability only.

The record

CVE
CVE-2025-38200
Published
Jul 4, 2025
Updated
Jun 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-191, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 4, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 11, 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=1bff652941c4d94f97610c9a30473aad6f5b2fff <015bac5daca978448f2671478c553ce1f300c21e
  2. Affected versionversion=1bff652941c4d94f97610c9a30473aad6f5b2fff <2a1f4f2e36442a9bdf771acf6ee86f3cf876e5ca
  3. Affected versionversion=1bff652941c4d94f97610c9a30473aad6f5b2fff <3502dd42f178dae9d54696013386bb52b4f2e655
  4. Affected versionversion=1bff652941c4d94f97610c9a30473aad6f5b2fff <5e75c9082987479e647c75ec8fdf18fa68263c42
  5. Affected versionversion=1bff652941c4d94f97610c9a30473aad6f5b2fff <872607632c658d3739e4e7889e4f3c419ae2c193
  6. Affected versionversion=1bff652941c4d94f97610c9a30473aad6f5b2fff <8cde755f56163281ec2c46b4ae8b61f532758a6f
  7. Affected versionversion=1bff652941c4d94f97610c9a30473aad6f5b2fff <d88a1e8f024ba26e19350958fecbf771a9960352
  8. Affected versionversion=1bff652941c4d94f97610c9a30473aad6f5b2fff <fecb2fc3fc10c95724407cc45ea35af4a65cdde2
  9. Affected versionversion=3.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1bff652941c4d94f97610c9a30473aad6f5b2fff <015bac5daca978448f2671478c553ce1f300c21e; version=1bff652941c4d94f97610c9a30473aad6f5b2fff <2a1f4f2e36442a9bdf771acf6ee86f3cf876e5ca; version=1bff652941c4d94f97610c9a30473aad6f5b2fff <3502dd42f178dae9d54696013386bb52b4f2e655; version=1bff652941c4d94f97610c9a30473aad6f5b2fff <5e75c9082987479e647c75ec8fdf18fa68263c42; version=1bff652941c4d94f97610c9a30473aad6f5b2fff <872607632c658d3739e4e7889e4f3c419ae2c193; version=1bff652941c4d94f97610c9a30473aad6f5b2fff <8cde755f56163281ec2c46b4ae8b61f532758a6f; version=1bff652941c4d94f97610c9a30473aad6f5b2fff <d88a1e8f024ba26e19350958fecbf771a9960352; version=1bff652941c4d94f97610c9a30473aad6f5b2fff <fecb2fc3fc10c95724407cc45ea35af4a65cdde2; version=3.12

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.0Oracle LinuxCVSS:3.1/AV:L/AC:H/PR:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-191Integer Underflow (Wrap or Wraparound)
T1499Endpoint Denial of Service

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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