CVE-2026-80891

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description An issue exists in the KVM s390 PCI implementation regarding the validation of the All-Interrupt Bit Vector (AIBV) and the All-Interrupt Summary Bit (AISB) before pinning guest pages. The AIBV size is determined by the NOI and AIBVO variables; if this size exceeds a single page boundary, the guest AIBV cannot be safely pinned. Additionally, the architecture requires doubleword alignment for the summary bit address, meaning the AISB address must be 8-byte aligned. Because the AISBO can address up to 64 bits, the AISB size is limited to 8 bytes to ensure it does not exceed a single page boundary.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.