Astra Linux – vulnerability in linux-5.10, linux-5.15

In the Linux kernel, the following vulnerability has been resolved: KVM: VMX: Fix crash due to uninitialized currentvmcs KVM enables ‘Enlightened VMCS’ and ‘Enlightened MSR Bitmap’ when running as a nested hypervisor on top of Hyper-V. When the MSR bitmap is updated, the evmcstouchmsrbitmap...

CVE-2023-53756

In the Linux kernel, the following vulnerability has been resolved: KVM: VMX: Fix crash due to uninitialized currentvmcs KVM enables 'Enlightened VMCS' and 'Enlightened MSR Bitmap' when running as a nested hypervisor on top of Hyper-V. When MSR bitmap is updated, evmcstouchmsrbitmap function uses...

CVE-2023-53756

Summary of CVE-2023-53756 (CVE-2023-53756) : The issue is in KVM with Intel VMX where MSR bitmap updates could use a per-CPU current_vmcs that may be uninitialized, allowing a NULL-dereference and potential crash on nested Hyper-V configurations. The root cause is the check for current_vmcs in ev...