Linux · Linux Kernel · CVE-2021-43056
**Name of the Vulnerable Software and Affected Versions**
Linux kernel versions prior to 5.14.15
**Description**
The issue is related to an implementation bug in the arch/powerpc/kvm/book3s hv rmhandlers.S file, specifically in the handling of the SRR1 register values. This bug allows a malicious KVM guest to crash the host when it is running on Power8. The vulnerability is due to the lack of checking of returned data when processing SRR1 values.
**Recommendations**
For versions prior to 5.14.15, update to version 5.14.15 or later to resolve the issue. As a temporary workaround, consider restricting access to the KVM guest functionality to minimize the risk of exploitation.