CVE-2025-39939 iommu/s390: Fix memory corruption when using identity domain

In the Linux kernel, the following vulnerability has been resolved: iommu/s390: Fix memory corruption when using identity domain zpcigetiommuctrs returns counter information to be reported as part of device statistics; these counters are stored as part of the s390domain. The problem, however, is...

CVE-2025-39939

The CVE-2025-39939 issue affects the Linux kernel (iommu/s390) where zpci_get_iommu_ctrs() could read a bad address for identity-domain devices, causing memory corruption. The root cause is that identity domains are not backed by an s390_domain, leading to an invalid to_s390_domain() result and o...