CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's s390/zcrypt component, specifically in the handling of internal buffer memory during the clear key import process. If exploited, this flaw could allow sensitive clear key material to remain in memory, potentially leading to unauthorized exposure through memory reuse. Organizations utilizing affected Linux systems, particularly those handling cryptographic operations, should prioritize remediation to mitigate the risk of data leakage.
Original NVD 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.