Fix Potential NULL Dereference in Nested Migration

CVE-2022-48793

What is CVE-2022-48793?

A vulnerability has been identified in the KVM (Kernel-based Virtual Machine) component of the Linux kernel, specifically affecting the x86 architecture. This issue arises from a flaw during the nested migration process due to improper sequencing in the code. The call to 'nested_svm_load_cr3' is executed too early before the Nested Page Table (NPT) is enabled, resulting in a potential NULL dereference. This improper execution order prevents KVM from accessing guest memory, as the necessary NPT initialization is not performed at that stage. The vulnerability has been addressed with a patch that corrects the sequence, ensuring that the required operations for initializing the memory access path are in place before the KVM processes guest requests.

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