CVE-2025-40164

Service interruption via preemptible usbnet receive path

Published Nov 12, 2025 · Updated Jun 19, 2026

Incorrect execution-context handling in Linux kernel 4.7 and affected later versions allows local users to interrupt service via an MTU change. usbnet_resume_rx() calls netif_rx() without disabling bottom halves, allowing usbnet_skb_return() to call smp_processor_id() while execution is preemptible. The user must have local access and permission to change a usbnet interface MTU; the exposed consequence is a kernel warning and availability loss, not data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect execution-context handling in Linux kernel 4.7 and affected later versions allows local users to interrupt service via an MTU change. usbnet_resume_rx() calls netif_rx() without disabling bottom halves, allowing usbnet_skb_return() to call smp_processor_id() while execution is preemptible. The user must have local access and permission to change a usbnet interface MTU; the exposed consequence is a kernel warning and availability loss, not data disclosure or modification.

The record

CVE
CVE-2025-40164
Published
Nov 12, 2025
Updated
Jun 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 12, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 19, 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=43daa96b166c3cf5ff30dfac0c5efa2620e4beab <0134c7bff14bd50314a4f92b182850ddfc38e255
  2. Affected versionversion=43daa96b166c3cf5ff30dfac0c5efa2620e4beab <17fbad93879e87a334062882b45fa727ba1b3dd7
  3. Affected versionversion=43daa96b166c3cf5ff30dfac0c5efa2620e4beab <327cd4b68b4398b6c24f10eb2b2533ffbfc10185
  4. Affected versionversion=43daa96b166c3cf5ff30dfac0c5efa2620e4beab <65d04291adf7c59338f87aab9c6fe0bfa9993e64
  5. Affected versionversion=43daa96b166c3cf5ff30dfac0c5efa2620e4beab <6635e52bc4165793aefd686962d912d73d323afe
  6. Affected versionversion=43daa96b166c3cf5ff30dfac0c5efa2620e4beab <d1944bab8e0c1511f0cbf364aa06547735bb0ddb
  7. Affected versionversion=43daa96b166c3cf5ff30dfac0c5efa2620e4beab <f45fffae5e2549bd0a4670cc52a15ad54c9f121e
  8. Affected versionversion=4.7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=43daa96b166c3cf5ff30dfac0c5efa2620e4beab <0134c7bff14bd50314a4f92b182850ddfc38e255; version=43daa96b166c3cf5ff30dfac0c5efa2620e4beab <17fbad93879e87a334062882b45fa727ba1b3dd7; version=43daa96b166c3cf5ff30dfac0c5efa2620e4beab <327cd4b68b4398b6c24f10eb2b2533ffbfc10185; version=43daa96b166c3cf5ff30dfac0c5efa2620e4beab <65d04291adf7c59338f87aab9c6fe0bfa9993e64; version=43daa96b166c3cf5ff30dfac0c5efa2620e4beab <6635e52bc4165793aefd686962d912d73d323afe; version=43daa96b166c3cf5ff30dfac0c5efa2620e4beab <d1944bab8e0c1511f0cbf364aa06547735bb0ddb; version=43daa96b166c3cf5ff30dfac0c5efa2620e4beab <f45fffae5e2549bd0a4670cc52a15ad54c9f121e; version=4.7

Published CVSS scores

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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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