# CVE-2026-98574: net: bcmgenet: stop Tx NAPI before disabling the queues

CVE-2026-98574 is fixed in linux on 1 platform by DEBIAN-CVE-2026-98574 (version 7.2.9-1), released October 19, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-98574
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0020
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 18, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98574

## Description

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

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 7.2.9-1 | [DEBIAN-CVE-2026-98574](https://patchblox.com/security/data/fix/linux/debian-cve-2026-98574.md) | Oct 19, 2026 |

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