CVE-2026-80708 is a vulnerability in Linux Kernel
Published on August 28, 2026
s390/zcrypt: Fix missing mem scrub at clear key import in cca_clr2cipherkey()
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.
Products Associated with CVE-2026-80708
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Affected Versions
Linux:- Version 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd and below 8e1c0def77b7450be0ed607ed0d7bae629d30020 is affected.
- Version 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd and below be7ae07fb745d1cf575b03a178a055b0a2859364 is affected.
- Version 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd and below 4e26d0d72bfdec311f12acfa0c6b7fbeb6a343d3 is affected.
- Version 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd and below 7dd6e556dbfc91d3d511cfd1015d2dad42608010 is affected.
- Version 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd and below b453003ae6a869f5bdf025b5519cbb38295ae4f1 is affected.
- Version 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd and below fbb0410986e8ad214121e51a4a28c3d0a10b7644 is affected.
- Version 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd and below ebfbb9ac7adbb1e3556100b54a27e8a9b102feac is affected.
- Version 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd and below 01476391aecef36a3b789ee844357b22fbc90665 is affected.
- Version 5.4 is affected.
- Before 5.4 is unaffected.
- Version 5.10.265, <= 5.10.* is unaffected.
- Version 5.15.216, <= 5.15.* is unaffected.
- Version 6.1.183, <= 6.1.* is unaffected.
- Version 6.6.152, <= 6.6.* is unaffected.
- Version 6.12.104, <= 6.12.* is unaffected.
- Version 6.18.44, <= 6.18.* is unaffected.
- Version 7.1.8, <= 7.1.* is unaffected.
- Version 7.2, <= * is unaffected.