A flaw was found in the way Linux kernel's KVM hypervisor handled deferred TLB
flush requests from guest. A race condition may occur between guest issuing
a deferred TLB flush request to KVM and KVM handling and acknowledging it.
This may result in invalid address translations from TLB being used to access
guest memory, leading to potential information leakage issue.
A guest user/process may use this flaw to access guest memory locations which
it should not have access to.
This issue can only be resolved by applying updates.
Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Created kernel tracking bugs for this issue:
Affects: fedora-all [bug 1796650]
This issue was fixed for Fedora with the 5.4.19 stable kernel updates.