Astra Linux – Vulnerability in Linux, Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: kvm: LAPIC: The guard that prevented illegal access to the APIC register has been restored. According to SDM, “Any access that touches the bytes 4 through 15 of an APIC register may cause undefined behavior and must not be...

Unity Linux 20.1060e / 20.1070e Security Update: kernel (UTSA-2026-004318)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-004318 advisory. A flaw was found in the way KVM hypervisor handled x2APIC Machine Specific Rregister MSR access with nested=1 virtualization enabled. In that, L1 guest could access...

Unity Linux 20.1070a Security Update: kernel (UTSA-2025-988864)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2025-988864 advisory. In the Linux kernel, the following vulnerability has been resolved: kvm: LAPIC: Restore guard to prevent illegal APIC register access Per the SDM, any access that...

kernel: KVM: SVM: improper check in svm_set_x2apic_msr_interception allows direct access to host x2apic msrs

A flaw was found in KVM. An improper check in svmsetx2apicmsrinterception may allow direct access to host x2apic msrs when the guest resets its apic, potentially leading to a denial of service condition...

kernel: KVM: SVM: improper check in svm_set_x2apic_msr_interception allows direct access to host x2apic msrs

A flaw was found in KVM. An improper check in svmsetx2apicmsrinterception may allow direct access to host x2apic msrs when the guest resets its apic, potentially leading to a denial of service condition...

SUSE CVE-2021-47255

In the Linux kernel, the following vulnerability has been resolved: kvm: LAPIC: Restore guard to prevent illegal APIC register access Per the SDM, "any access that touches bytes 4 through 15 of an APIC register may cause undefined behavior and must not be executed." Worse, such an access in...

AZL-6521 CVE-2019-3887 affecting package kernel for versions less than 5.10.78.1-1

A flaw was found in the way KVM hypervisor handled x2APIC Machine Specific Rregister MSR access with nested=1 virtualization enabled. In that, L1 guest could access L0's APIC register values via L2 guest, when 'virtualize x2APIC mode' is enabled. A guest could use this flaw to potentially crash t...

Linux Kernel (x86) - Memory Sinkhole Privilege Escalation

Linux Kernel x86 - Memory Sinkhole Privilege Escalation ; memory sinkhole proof of concept ; hijack ring -2 execution through the apic overlay attack. ; deployed in ring 0 ; the SMBASE register of the core under attack TARGETSMBASE equ 0x1f5ef800 ; the location of the attack GDT. ; this is...