CVE-2026-80545

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> s390/zcrypt: Improve EP11 CPRB length and overflow checks<br /> <br /> The xcrb_msg_to_type6_ep11cprb_msgx() function lacks proper input<br /> validation, creating security vulnerabilities:<br /> 1. Missing minimum size validation: The ep11_cprb structure and<br /> subsequent payload fields (pld_tag, pld_lenfmt) are copied from<br /> userspace without verifying sufficient buffer length.<br /> 2. Arithmetic overflow in length calculations: CEIL4 alignment could<br /> overflow, bypassing size checks and enabling buffer overflows.<br /> 3. The payload is asn1 encoded but the function just uses a simple c<br /> struct overlay to access some fields of the payload.<br /> <br /> Fix by using size_t for length calculations, adding U32_MAX boundary<br /> checks after alignment, and validating minimum request size and<br /> minimum reply size before copying from userspace. Do a very simple<br /> asn1 parsing of the payload up to the function value field.