# CVE-2026-80708: s390/zcrypt: Fix missing mem scrub at clear key import in cca_clr2cipherkey()

CVE-2026-80708 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-80708, released August 29, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-80708
- Priority: High
- CVSS: 7.1 (Moderate)
- EPSS: 0.0022
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 28, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-80708

## Description

In the Linux kernel, the following vulnerability has been resolved:  s390/zcrypt: Fix missing mem scrub at clear key import in cca_clr2cipherkey()  The helper function _ip_cprb_helper() uses internal buffer memory for building and processing CPRBs. After use this buffer was never scrubbed which could lead to leaving for example clear key material in memory which could be exposed via tricky reuse of this same memory.  Extend the _ip_cprb_helper() function with another parameter 'scrub' used to steer scrubbing of this buffer. So now the caller has the opportunity to decide if scrubbing is needed or not.  Extend the clear key to secure key token import process in function cca_clr2cipherkey() to tell the helper function from above to scrub the cprb buffer when the clear key value is part of the request data.  Add explicit scrubbing on return from function cca_clr2cipherkey() for the random EXOR buffer and the cprb buffer.  Overall this cleans the internal used buffer in case of clear key import to prevent sensitive data to get exposed.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.187-1 | [DEBIAN-CVE-2026-80708](https://patchblox.com/security/data/fix/linux/debian-cve-2026-80708.md) | Aug 29, 2026 |
| Linux | linux Debian 13.5 (trixie) | 6.12.105-1 | [DEBIAN-CVE-2026-80708](https://patchblox.com/security/data/fix/linux/debian-cve-2026-80708.md) | Aug 29, 2026 |
| Linux | linux Debian 14 | 7.1.8-1 | [DEBIAN-CVE-2026-80708](https://patchblox.com/security/data/fix/linux/debian-cve-2026-80708.md) | Aug 29, 2026 |
| Linux | linux-6.12 Debian 12.15 (bookworm) | 6.12.107-1~deb12u1 | [DEBIAN-CVE-2026-80708](https://patchblox.com/security/data/fix/linux/debian-cve-2026-80708.md) | Aug 29, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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