Kernel: kvm: nVMX: L2 guest may trick the L0 hypervisor to access sensitive L1 resources

A flaw was found in the way KVM hypervisor handled instruction emulation for the L2 guest when nested=1 virtualization is enabled. In the instruction emulation, the L2 guest could trick the L0 hypervisor into accessing sensitive bits of the L1 hypervisor. An L2 guest could use this flaw to...

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 the host kernel resulting in DoS issue. Kernel versions from 4.16 and newer are vulnerable to this issue.

...

Kernel: kvm: nVMX: L2 guest may trick the L0 hypervisor to access sensitive L1 resources

A flaw was found in the way KVM hypervisor handled instruction emulation for the L2 guest when nested=1 virtualization is enabled. In the instruction emulation, the L2 guest could trick the L0 hypervisor into accessing sensitive bits of the L1 hypervisor. An L2 guest could use this flaw to...

CVE-2019-20556

An issue was discovered on Samsung mobile devices with P9.0 SM6150, SM8150, SM8150FUSION, exynos7885, exynos9610, and exynos9820 chipsets software. RKP memory corruption allows attackers to control the effective address in EL2. The Samsung ID is SVE-2019-15221 October 2019...

USN-4303-1 linux, linux-aws, linux-kvm vulnerability

Paulo Bonzini discovered that the KVM hypervisor implementation in the Linux kernel could improperly let a nested level 2 guest access the resources of a parent level 1 guest in certain situations. An attacker could use this to expose sensitive information...

Kernel: KVM: nVMX: use-after-free of the hrtimer for emulation of the preemption timer

A use-after-free vulnerability was found in the way the Linux kernel's KVM hypervisor emulates a preemption timer for L2 guests when nested =1 virtualization is enabled. This high resolution timerhrtimer runs when a L2 guest is active. After VM exit, the syncvmcs12 timer object is stopped. The...

DEBIAN-CVE-2019-11743

Navigation events were not fully adhering to the W3C's "Navigation-Timing Level 2" draft specification in some instances for the unload event, which restricts access to detailed timing attributes to only be same-origin. This resulted in potential cross-origin information exposure of history throu...

UBUNTU-CVE-2017-12154

The preparevmcs02 function in arch/x86/kvm/vmx.c in the Linux kernel through 4.13.3 does not ensure that the "CR8-load exiting" and "CR8-store exiting" L0 vmcs02 controls exist in cases where L1 omits the "use TPR shadow" vmcs12 control, which allows KVM L2 guest OS users to obtain read and write...

UBUNTU-CVE-2016-9816

Xen through 4.7.x allows local ARM guest OS users to cause a denial of service host crash via vectors involving an asynchronous abort while at EL2...

DEBIAN-CVE-2016-9816

Xen through 4.7.x allows local ARM guest OS users to cause a denial of service host crash via vectors involving an asynchronous abort while at EL2...

DEBIAN-CVE-2016-9588

arch/x86/kvm/vmx.c in the Linux kernel through 4.9 mismanages the BP and OF exceptions, which allows guest OS users to cause a denial of service guest OS crash by declining to handle an exception thrown by an L2 guest...

CVE-2016-9159

A vulnerability has been identified in SIMATIC S7-300 CPU family All versions, SIMATIC S7-300 CPU family incl. related ET200 CPUs and SIPLUS variants All versions, SIMATIC S7-400 PN/DP V6 and below CPU family incl. SIPLUS variants All versions, SIMATIC S7-400 PN/DP V7 CPU family incl. SIPLUS...

PT-2016-7673

Name of the Vulnerable Software and Affected Versions SIMATIC S7-300 CPU family versions all SIMATIC S7-400 PN/DP V6 and below CPU family versions all SIMATIC S7-400 PN/DP V7 CPU family versions all SIMATIC S7-400 V6 and earlier CPU family versions all SIMATIC S7-400 V7 CPU family versions all...

DEBIAN-CVE-2015-7835

The modl2entry function in arch/x86/mm.c in Xen 3.4 through 4.6.x does not properly validate level 2 page table entries, which allows local PV guest administrators to gain privileges via a crafted superpage mapping...

UBUNTU-CVE-2015-7835

The modl2entry function in arch/x86/mm.c in Xen 3.4 through 4.6.x does not properly validate level 2 page table entries, which allows local PV guest administrators to gain privileges via a crafted superpage mapping...

Qemu: qcow1: validate L2 table size to avoid integer overflows

An integer overflow flaw was found in the QEMU block driver for QCOW version 1 disk images. A user able to alter the QEMU disk image files loaded by a guest could use this flaw to corrupt QEMU process memory on the host, which could potentially result in arbitrary code execution on the host with...