---
id: CVE-2025-38385
title: 'net: usb: lan78xx: fix WARN in __netif_napi_del_locked on disconnect'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: usb: lan78xx: fix WARN in __netif_napi_del_locked on disconnect

  Remove redundant netif_napi_del() call from disconnect path.

  A WARN may be triggered in __netif_n…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= ec4c7e12396b1a30fbacfa68425118f5b46ea878 <
    7135056a49035597198280820c61b8c5dbe4a1d0
  - >-
    Linux >= ec4c7e12396b1a30fbacfa68425118f5b46ea878 <
    968a419c95131e420f12bbdba19e96e2f6b071c4
  - >-
    Linux >= ec4c7e12396b1a30fbacfa68425118f5b46ea878 <
    510a6095d754df9d727f644ec5076b7929d6c9ea
  - >-
    Linux >= ec4c7e12396b1a30fbacfa68425118f5b46ea878 <
    17a37b9a5dd945d86110838fb471e7139ba993a2
  - >-
    Linux >= ec4c7e12396b1a30fbacfa68425118f5b46ea878 <
    6c7ffc9af7186ed79403a3ffee9a1e5199fc7450
  - Linux 5.17
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T20:55:42.707103Z'
published: '2025-07-25'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T21:02:35.986Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-38385'
references:
  - url: 'https://git.kernel.org/stable/c/7135056a49035597198280820c61b8c5dbe4a1d0'
  - url: 'https://git.kernel.org/stable/c/968a419c95131e420f12bbdba19e96e2f6b071c4'
  - url: 'https://git.kernel.org/stable/c/510a6095d754df9d727f644ec5076b7929d6c9ea'
  - url: 'https://git.kernel.org/stable/c/17a37b9a5dd945d86110838fb471e7139ba993a2'
  - url: 'https://git.kernel.org/stable/c/6c7ffc9af7186ed79403a3ffee9a1e5199fc7450'
tags:
  - cve.org
epss: 0.002
epssPercentile: 0.09857
ingestedAt: '2026-11-05T22:38:31.963Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

net: usb: lan78xx: fix WARN in __netif_napi_del_locked on disconnect

Remove redundant netif_napi_del() call from disconnect path.

A WARN may be triggered in __netif_napi_del_locked() during USB device
disconnect:

  WARNING: CPU: 0 PID: 11 at net/core/dev.c:7417 __netif_napi_del_locked+0x2b4/0x350

This happens because netif_napi_del() is called in the disconnect path while
NAPI is still enabled. However, it is not necessary to call netif_napi_del()
explicitly, since unregister_netdev() will handle NAPI teardown automatically
and safely. Removing the redundant call avoids triggering the warning.

Full trace:
 lan78xx 1-1:1.0 enu1: Failed to read register index 0x000000c4. ret = -ENODEV
 lan78xx 1-1:1.0 enu1: Failed to set MAC down with error -ENODEV
 lan78xx 1-1:1.0 enu1: Link is Down
 lan78xx 1-1:1.0 enu1: Failed to read register index 0x00000120. ret = -ENODEV
 ------------[ cut here ]------------
 WARNING: CPU: 0 PID: 11 at net/core/dev.c:7417 __netif_napi_del_locked+0x2b4/0x350
 Modules linked in: flexcan can_dev fuse
 CPU: 0 UID: 0 PID: 11 Comm: kworker/0:1 Not tainted 6.16.0-rc2-00624-ge926949dab03 #9 PREEMPT
 Hardware name: SKOV IMX8MP CPU revC - bd500 (DT)
 Workqueue: usb_hub_wq hub_event
 pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
 pc : __netif_napi_del_locked+0x2b4/0x350
 lr : __netif_napi_del_locked+0x7c/0x350
 sp : ffffffc085b673c0
 x29: ffffffc085b673c0 x28: ffffff800b7f2000 x27: ffffff800b7f20d8
 x26: ffffff80110bcf58 x25: ffffff80110bd978 x24: 1ffffff0022179eb
 x23: ffffff80110bc000 x22: ffffff800b7f5000 x21: ffffff80110bc000
 x20: ffffff80110bcf38 x19: ffffff80110bcf28 x18: dfffffc000000000
 x17: ffffffc081578940 x16: ffffffc08284cee0 x15: 0000000000000028
 x14: 0000000000000006 x13: 0000000000040000 x12: ffffffb0022179e8
 x11: 1ffffff0022179e7 x10: ffffffb0022179e7 x9 : dfffffc000000000
 x8 : 0000004ffdde8619 x7 : ffffff80110bcf3f x6 : 0000000000000001
 x5 : ffffff80110bcf38 x4 : ffffff80110bcf38 x3 : 0000000000000000
 x2 : 0000000000000000 x1 : 1ffffff0022179e7 x0 : 0000000000000000
 Call trace:
  __netif_napi_del_locked+0x2b4/0x350 (P)
  lan78xx_disconnect+0xf4/0x360
  usb_unbind_interface+0x158/0x718
  device_remove+0x100/0x150
  device_release_driver_internal+0x308/0x478
  device_release_driver+0x1c/0x30
  bus_remove_device+0x1a8/0x368
  device_del+0x2e0/0x7b0
  usb_disable_device+0x244/0x540
  usb_disconnect+0x220/0x758
  hub_event+0x105c/0x35e0
  process_one_work+0x760/0x17b0
  worker_thread+0x768/0xce8
  kthread+0x3bc/0x690
  ret_from_fork+0x10/0x20
 irq event stamp: 211604
 hardirqs last  enabled at (211603): [<ffffffc0828cc9ec>] _raw_spin_unlock_irqrestore+0x84/0x98
 hardirqs last disabled at (211604): [<ffffffc0828a9a84>] el1_dbg+0x24/0x80
 softirqs last  enabled at (211296): [<ffffffc080095f10>] handle_softirqs+0x820/0xbc8
 softirqs last disabled at (210993): [<ffffffc080010288>] __do_softirq+0x18/0x20
 ---[ end trace 0000000000000000 ]---
 lan78xx 1-1:1.0 enu1: failed to kill vid 0081/0

## Affected

- `Linux >= ec4c7e12396b1a30fbacfa68425118f5b46ea878 < 7135056a49035597198280820c61b8c5dbe4a1d0`
- `Linux >= ec4c7e12396b1a30fbacfa68425118f5b46ea878 < 968a419c95131e420f12bbdba19e96e2f6b071c4`
- `Linux >= ec4c7e12396b1a30fbacfa68425118f5b46ea878 < 510a6095d754df9d727f644ec5076b7929d6c9ea`
- `Linux >= ec4c7e12396b1a30fbacfa68425118f5b46ea878 < 17a37b9a5dd945d86110838fb471e7139ba993a2`
- `Linux >= ec4c7e12396b1a30fbacfa68425118f5b46ea878 < 6c7ffc9af7186ed79403a3ffee9a1e5199fc7450`
- `Linux 5.17`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.