An issue was discovered in the Linux kernel. The KVM subsystem allows out-of-range access to memslots after a deletion. This affects arch/s390/kvm/kvm-s390.c, include/linux/kvm_host.h, and virt/kvm/kvm_main.c. Reference and upstream patch: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0774a964ef561b7170d8d1b1bfe6f88002b6d219
Created kernel tracking bugs for this issue: Affects: fedora-all [bug 1947987]
This was fixed for Fedora with the 5.7 kernel rebases.
Mitigation: Mitigation for this issue is either not available or the currently available options does not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.