---
id: CVE-2026-98574
title: 'net: bcmgenet: stop Tx NAPI before disabling the queues'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: bcmgenet: stop Tx NAPI before disabling the queues

  bcmgenet_netif_stop() and the Wake-on-LAN branch of bcmgenet_suspend()
  both disable the Tx queues first and sto…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 254f3239dd070e469f45c3ca8b6ac38e47d6c730 <
    63bcc2fee6419963e45e7c2cd698fa862409601d
  - >-
    Linux >= 254f3239dd070e469f45c3ca8b6ac38e47d6c730 <
    f329d42423089904758f2685cda295de9bf99441
  - >-
    Linux >= 254f3239dd070e469f45c3ca8b6ac38e47d6c730 <
    7e87508b5c4d81210d0a736ed01962e52f5c4c56
  - Linux 6.15
published: '2026-10-18'
updated: '2026-10-18'
sourceUpdated: '2026-10-18T15:18:39.767Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-98574'
references:
  - url: 'https://git.kernel.org/stable/c/63bcc2fee6419963e45e7c2cd698fa862409601d'
  - url: 'https://git.kernel.org/stable/c/f329d42423089904758f2685cda295de9bf99441'
  - url: 'https://git.kernel.org/stable/c/7e87508b5c4d81210d0a736ed01962e52f5c4c56'
tags:
  - cve.org
ingestedAt: '2026-10-18T15:45:12.256Z'
---

## Overview

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

net: bcmgenet: stop Tx NAPI before disabling the queues

bcmgenet_netif_stop() and the Wake-on-LAN branch of bcmgenet_suspend()
both disable the Tx queues first and stop Tx NAPI several steps later. A
completion in flight calls netif_tx_wake_queue() in between, and nothing
stops the queue again, so a transmit can reach the rings after they have
been freed.

Close is safe because dev_deactivate_many() stops the qdisc first.
bcmgenet_suspend() does not, so stop Tx NAPI before the queues on both
paths.

KASAN on a Raspberry Pi CM4, driven from an MTU change because suspend
freezes user space before the callback runs:

  BUG: KASAN: use-after-free in bcmgenet_xmit+0x17f8/0x2258
  Write of size 8 at addr ffffff8055844a68 by task ksoftirqd/0/14
   bcmgenet_xmit+0x17f8/0x2258
   dev_hard_start_xmit+0x13c/0x588
   sch_direct_xmit+0x108/0x340
   __dev_queue_xmit+0x1190/0x3848

## Affected

- `Linux >= 254f3239dd070e469f45c3ca8b6ac38e47d6c730 < 63bcc2fee6419963e45e7c2cd698fa862409601d`
- `Linux >= 254f3239dd070e469f45c3ca8b6ac38e47d6c730 < f329d42423089904758f2685cda295de9bf99441`
- `Linux >= 254f3239dd070e469f45c3ca8b6ac38e47d6c730 < 7e87508b5c4d81210d0a736ed01962e52f5c4c56`
- `Linux 6.15`

## Remediation

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