CVE-2025-38270

Kernel warning via unscheduled NAPI completion

Published Jul 10, 2025 · Updated Aug 5, 2026

Improper NAPI completion in affected Linux kernel releases allows local users with CAP_SYS_ADMIN to trigger a kernel warning via netpoll. The netdevsim polling path calls napi_complete_done() during netpoll even when netpoll has prematurely cleared the NAPI scheduling bit. Creating the simulated device and configuring netconsole or netpoll require root-only operations, and published evidence demonstrates a warning rather than a broader service interruption.

CVSS severity4.8
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

Improper NAPI completion in affected Linux kernel releases allows local users with CAP_SYS_ADMIN to trigger a kernel warning via netpoll. The netdevsim polling path calls napi_complete_done() during netpoll even when netpoll has prematurely cleared the NAPI scheduling bit. Creating the simulated device and configuring netconsole or netpoll require root-only operations, and published evidence demonstrates a warning rather than a broader service interruption.

The record

CVE
CVE-2025-38270
Published
Jul 10, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jul 10, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3762ec05a9fbda16aaaa2568df679ab8ad13f38d <1264971017b4d7141352a7fe29021bdfce5d885d
  2. Affected versionversion=3762ec05a9fbda16aaaa2568df679ab8ad13f38d <6837dd877270c57689bd866de9f3de14172c2439
  3. Affected versionversion=3762ec05a9fbda16aaaa2568df679ab8ad13f38d <a8ff2e362d901200a1075c3ca9c56d9c7bbef389
  4. Affected versionversion=6.10

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=3762ec05a9fbda16aaaa2568df679ab8ad13f38d <1264971017b4d7141352a7fe29021bdfce5d885d; version=3762ec05a9fbda16aaaa2568df679ab8ad13f38d <6837dd877270c57689bd866de9f3de14172c2439; version=3762ec05a9fbda16aaaa2568df679ab8ad13f38d <a8ff2e362d901200a1075c3ca9c56d9c7bbef389; version=6.10

Published CVSS scores

3.3SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
4.8SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/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.

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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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