{"apiVersion":"1.0","identifier":"CVE-2026-80546","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.","publishedAt":"2026-08-26T15:17:08","lastModifiedAt":"2026-08-27T06:17:36","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-80546","cvssScore":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","epssProbability":0.00136,"riskScore":0.79,"affectedProduct":"Linux kernel","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-80546","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-80546","en":"https://www.redsauce.net/en/cves/CVE-2026-80546","fr":"https://www.redsauce.net/fr/cves/CVE-2026-80546","pt":"https://www.redsauce.net/pt/cves/CVE-2026-80546","de":"https://www.redsauce.net/de/cves/CVE-2026-80546","sk":"https://www.redsauce.net/sk/cves/CVE-2026-80546","el":"https://www.redsauce.net/el/cves/CVE-2026-80546"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-80546"}}