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.
References
Configurations
No configuration.
History
No history.
Information
Published : 2026-08-26 15:17
Updated : 2026-08-27 06:17
NVD link : CVE-2026-80546
Mitre link : CVE-2026-80546
CVE.ORG link : CVE-2026-80546
JSON object : View
Products Affected
No product.
CWE
No CWE.