CVE-2026-43479

Kernel warning via redundant NAPI deletion

Published May 13, 2026 · Updated May 13, 2026

Improper NAPI teardown in the Linux Kernel 6.17 allows local users to trigger a kernel warning by disconnecting a LAN78xx USB device. The lan78xx_disconnect path calls netif_napi_del while NAPI remains enabled, even though unregister_netdev performs that teardown safely. Reachability requires a bound LAN78xx USB network device and a disconnect event; the published trace establishes a warning, not a kernel crash.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper NAPI teardown in the Linux Kernel 6.17 allows local users to trigger a kernel warning by disconnecting a LAN78xx USB device. The lan78xx_disconnect path calls netif_napi_del while NAPI remains enabled, even though unregister_netdev performs that teardown safely. Reachability requires a bound LAN78xx USB network device and a disconnect event; the published trace establishes a warning, not a kernel crash.

The record

CVE
CVE-2026-43479
Published
May 13, 2026
Updated
May 13, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 13, 2026CVE publishedPublication date reported by the CVE source.
  2. May 13, 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=6.17
  2. Affected versionversion=e110bc82589752909e283ba5cbc160e0ab56c085 <20ce2bd1c1848414c5d3520d301ed3f5751ed634
  3. Affected versionversion=e110bc82589752909e283ba5cbc160e0ab56c085 <312c816c6bc30342bc30dca0d6db617ab4d3ae4e
  4. Affected versionversion=e110bc82589752909e283ba5cbc160e0ab56c085 <395a8b903738511f536c97c427e15ef038e1a11c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.17; version=e110bc82589752909e283ba5cbc160e0ab56c085 <20ce2bd1c1848414c5d3520d301ed3f5751ed634; version=e110bc82589752909e283ba5cbc160e0ab56c085 <312c816c6bc30342bc30dca0d6db617ab4d3ae4e; version=e110bc82589752909e283ba5cbc160e0ab56c085 <395a8b903738511f536c97c427e15ef038e1a11c

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

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

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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