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

> A use-after-free in the Broadcom GENET network driver allows attackers to cause a denial of service or potentially execute code via race conditions during network interface suspension.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 18 Oct 2026
- **Updated:** 19 Oct 2026
- **Also known as:** BELL-CVE-2026-98574, DEBIAN-CVE-2026-98574, GHSA-rfvr-hxpg-f67j, UBUNTU-CVE-2026-98574

## What is CVE-2026-98574?

CVE-2026-98574 is an use after free vulnerability in Linux, published on 18 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official 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

## Which versions are affected by CVE-2026-98574?


## How do I fix CVE-2026-98574?

Apply the vendor's patch.

## Is CVE-2026-98574 being exploited?

There is no known exploitation of CVE-2026-98574 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-98574 and fix it if it is affected.

What it is: CVE-2026-98574 is an use after free vulnerability in Linux, published on 18 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-98574 in the wild and no public exploit code.

Affected product: Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-98574/ (Markdown: https://insights.sbomify.com/CVE-2026-98574/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-98574
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-98574
- OSV: https://osv.dev/vulnerability/CVE-2026-98574

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-98574/
Summaries are generated and may contain mistakes; the official description above is the record.