CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's s390/zcrypt component, specifically in the xcrb_msg_to_type6cprb_msgx() function, which fails to properly validate input, leading to potential integer and arithmetic overflows. This can result in undersized buffer allocations, uninitialized memory access, and buffer overflows, posing a risk of data corruption or unauthorized access. Organizations using affected Linux systems should prioritize addressing this vulnerability to mitigate potential exploitation risks.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: s390/zcrypt: Improve CCA CPRB length and overflow checks The xcrb_msg_to_type6cprb_msgx() function lacks proper input validation, creating security vulnerabilities: 1. Integer overflow after CEIL4 alignment: Signed int variables could overflow during 4-byte boundary alignment, causing undersized buffer allocations or incorrect bounds checking. 2. Missing minimum size validation: The CPRBX structure is copied from userspace without verifying sufficient buffer length. Undersized buffers cause uninitialized memory access when reading structure fields like cprbx.cprb_len and cprbx.domain. 3. Arithmetic overflow in sum calculations: Adding control block and data block sizes could overflow, bypassing size checks and enabling buffer overflows. Fix by using size_t for length calculations, adding U32_MAX boundary checks after alignment, validating minimum control block size before copying from userspace, and detecting sum calculation overflows.