{"id":"CVE-2026-80545","title":"In the Linux kernel, the following vulnerability has been resolved:\n\ns390/zcrypt: Improve EP11 CPRB length and overflow checks\n\nThe xcrb_msg_to_type6_ep11cprb_msgx() function lacks proper input\nvalidation, creating security vulnerabiliti…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ns390/zcrypt: Improve EP11 CPRB length and overflow checks\n\nThe xcrb_msg_to_type6_ep11cprb_msgx() function lacks proper input\nvalidation, creating security vulnerabiliti…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= 20b0b0159390fa5c00a435195649680fefda81e0 < f463f474773aa49ed1d6087d95d44cea7099fdc7","Linux >= e2c6d91eb8b1533753755f07803e47eceed263d0 < 2976b9d2e716c7e5487ca7c29a7bd076cf9adf08","Linux >= e2c6d91eb8b1533753755f07803e47eceed263d0 < 17ac0bc866fc624cd05f022dcd8b730c0af11bb1","Linux 7.1"],"published":"2026-08-26","updated":"2026-10-15","sourceUpdated":"2026-10-15T11:17:50.903","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-80545","references":[{"url":"https://git.kernel.org/stable/c/17ac0bc866fc624cd05f022dcd8b730c0af11bb1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/2976b9d2e716c7e5487ca7c29a7bd076cf9adf08","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f463f474773aa49ed1d6087d95d44cea7099fdc7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00183,"epssPercentile":0.07311,"ingestedAt":"2026-10-15T11:00:41.665Z","slug":"CVE-2026-80545","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ns390/zcrypt: Improve EP11 CPRB length and overflow checks\n\nThe xcrb_msg_to_type6_ep11cprb_msgx() function lacks proper input\nvalidation, creating security vulnerabilities:\n1. Missing minimum size validation: The ep11_cprb structure and\n   subsequent payload fields (pld_tag, pld_lenfmt) are copied from\n   userspace without verifying sufficient buffer length.\n2. Arithmetic overflow in length calculations: CEIL4 alignment could\n   overflow, bypassing size checks and enabling buffer overflows.\n3. The payload is asn1 encoded but the function just uses a simple c\n   struct overlay to access some fields of the payload.\n\nFix by using size_t for length calculations, adding U32_MAX boundary\nchecks after alignment, and validating minimum request size and\nminimum reply size before copying from userspace. Do a very simple\nasn1 parsing of the payload up to the function value field.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}