CVE-2026-80921

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

Description An issue exists in the KVM s390 vsie component where crypto access bits are shadowed from a format0 apcb (crycb 0 or 1). Specifically, bits 64 through 255 remain unchanged from the values in the vsie page within the crycb and apcb. This allows a nested guest to potentially access a device that is no longer available.

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