CVE-2026-80708: Linux Vulnerability

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.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

Vendor	Product	Versions
Linux	Linux	>= 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd, < 8e1c0def77b7450be0ed607ed0d7bae629d30020; >= 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd, < be7ae07fb745d1cf575b03a178a055b0a2859364; >= 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd, < 4e26d0d72bfdec311f12acfa0c6b7fbeb6a343d3; >= 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd, < 7dd6e556dbfc91d3d511cfd1015d2dad42608010; >= 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd, < b453003ae6a869f5bdf025b5519cbb38295ae4f1; >= 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd, < fbb0410986e8ad214121e51a4a28c3d0a10b7644; >= 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd, < ebfbb9ac7adbb1e3556100b54a27e8a9b102feac; >= 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd, < 01476391aecef36a3b789ee844357b22fbc90665
Linux	Linux	5.4

References

Timeline

Published: Aug 28, 2026
Last Modified: Aug 28, 2026
Status: Received

Frequently Asked Questions

What is CVE-2026-80708?

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.

How severe is CVE-2026-80708?

Severity scoring for CVE-2026-80708 is pending analysis.

How do I fix CVE-2026-80708?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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