{"cve":"CVE-2026-80891","nvd":{"published":"2026-09-04T18:17:57.217","modified":"2026-09-04T18:17:57.217","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: s390: pci: Validate AIBV and AISB before pinning guest pages\n\nThe AIBV holds one bit per MSI-X vector for a given function. The size of\nthe bit vector is derived from the NOI and the AIBVO. If the size of the\nAIBV exceeds a single page boundary, then reject the request as we cannot\nsafely pin the guest AIBV.\n\nSimilarly reject the request if the AISB address is not 8-byte aligned as\nthe architecture requires doubleword alignment for the summary bit address.\nSince the AISBO can address up to 64 bits, the size of the AISB can only be\n8 bytes for the function. This also ensures the AISB doesn't exceed a\nsingle page boundary.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/15df7700dd99f8a37f5c6ed2dcf1e33009cdba47","https://git.kernel.org/stable/c/3a1c64220ede4ac9ef9a3e76f008ff60a34f4c48","https://git.kernel.org/stable/c/868d32ac72cba21c5c6d8a66a814b7c25a3a5c01","https://git.kernel.org/stable/c/b878ba7e28144c9a857bc847d31f3c45413450ac","https://git.kernel.org/stable/c/f00ef8efd41440129ccd88f4a1ebebf8d61d297f"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:52:03.409947763+00:00"},"epss":{"cve":"CVE-2026-80891","score":0.00215,"percentile":0.11853,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}