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...

Important: kernel

Issue Overview: A use-after-free vulnerability was found in the way the Linux kernel's KVM hypervisor implements its device control API. While creating a device via kvmioctlcreatedevice, the device holds a reference to a VM object, later this reference is transferred to the caller's file descript...

CVE-2019-7221

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...

Fedora 28 : xen (2018-a7862a75f5)

preemption checks bypassed in x86 PV MM handling XSA-264, CVE-2018-12891 1595959 x86: DB exception safety check can be triggered by a guest XSA-265, CVE-2018-12893 1595958 libxl fails to honour readonly flag on HVM emulated SCSI disks XSA-266, CVE-2018-12892 1595957 Note that Tenable Network...

SUSE-SU-2018:2081-2 Security update for xen

This update for xen fixes the following issues: Security issues fixed: - CVE-2018-12891: Fix preemption checks bypass in x86 PV MM handling XSA-264 bsc1097521. - CVE-2018-12892: Fix libxl failure to honour readonly flag on HVM emulated SCSI disks XSA-266 bsc1097523. - CVE-2018-12893: Fix DB...

Important: Red Hat Security Advisory: kernel-rt security and bug fix update

An update for kernel-rt is now available for Red Hat Enterprise MRG 2. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerability from t...

SUSE SLES12 Security Update : xen (SUSE-SU-2018:2081-1)

This update for xen fixes the following issues: Security issues fixed : - CVE-2018-12891: Fix preemption checks bypass in x86 PV MM handling XSA-264 bsc1097521. - CVE-2018-12892: Fix libxl failure to honour readonly flag on HVM emulated SCSI disks XSA-266 bsc1097523. - CVE-2018-12893: Fix DB...

Fedora 27 : xen (2018-1a467757ce)

preemption checks bypassed in x86 PV MM handling XSA-264, CVE-2018-12891 x86: DB exception safety check can be triggered by a guest XSA-265, CVE-2018-12893 libxl fails to honour readonly flag on HVM emulated SCSI disks XSA-266, CVE-2018-12892 ---- Speculative register leakage from lazy FPU contex...

DEBIAN-CVE-2018-12891

An issue was discovered in Xen through 4.10.x. Certain PV MMU operations may take a long time to process. For that reason Xen explicitly checks for the need to preempt the current vCPU at certain points. A few rarely taken code paths did bypass such checks. By suitably enforcing the conditions...

UBUNTU-CVE-2018-12891

An issue was discovered in Xen through 4.10.x. Certain PV MMU operations may take a long time to process. For that reason Xen explicitly checks for the need to preempt the current vCPU at certain points. A few rarely taken code paths did bypass such checks. By suitably enforcing the conditions...

ALPINE-CVE-2018-12891

An issue was discovered in Xen through 4.10.x. Certain PV MMU operations may take a long time to process. For that reason Xen explicitly checks for the need to preempt the current vCPU at certain points. A few rarely taken code paths did bypass such checks. By suitably enforcing the conditions...

preemption checks bypassed in x86 PV MM handling

ISSUE DESCRIPTION Certain PV MMU operations may take a long time to process. For that reason Xen explicitly checks for the need to preempt the current vCPU at certain points. A few rarely taken code paths did bypass such checks. By suitably enforcing the conditions through its own page table...

SUSE-SU-2018:0678-1 Security update for xen

This update for xen fixes several issues. These security issues were fixed: - CVE-2017-5753, CVE-2017-5715, CVE-2017-5754: Prevent information leaks via side effects of speculative execution, aka 'Spectre' and 'Meltdown' attacks bsc1074562, bsc1068032 - CVE-2018-5683: The vgadrawtext function...

SUSE-SU-2018:0638-1 Security update for xen

This update for xen fixes several issues. This new feature was included: - add script and sysv service to watch for vcpu online/offline events in a HVM domU These security issues were fixed: - CVE-2017-5753, CVE-2017-5715, CVE-2017-5754: Prevent information leaks via side effects of speculative...

DoS via non-preemptable L3/L4 pagetable freeing

ISSUE DESCRIPTION Guests have the ability to request removal of memory from themselves. This operation is intended to be requested for normal read/write pages, but is also permitted to be used on other types of pages. So far this in particular included pages pinned to their current type, with the...

Nexus 9 vs. Malicious Headphones, Take Two

Nexus 9 vs. Malicious Headphones, Take Two In March 2017 we disclosed CVE-2017-0510, a critical vulnerability in Nexus 9, that allowed for quite unique an attack by malicious headphones. Interestingly, its patch was insufficient. We had responsibly reported that finding CVE-2017-0648 to Google,...

FreeBSD : xen-kernel and xen-tools -- Long latency MMIO mapping operations are not preemptible (d40c66cb-27e4-11e5-a4a5-002590263bf5)

The Xen Project reports : The XENDOMCTLmemorymapping hypercall allows long running operations without implementing preemption. This hypercall is used by the device model as part of the emulation associated with configuration of PCI devices passed through to HVM guests and is therefore indirectly...

Long latency MMIO mapping operations are not preemptible

ISSUE DESCRIPTION The XENDOMCTLmemorymapping hypercall allows long running operations without implementing preemption. This hypercall is used by the device model as part of the emulation associated with configuration of PCI devices passed through to HVM guests and is therefore indirectly exposed ...

xen-kernel and xen-tools -- Long latency MMIO mapping operations are not preemptible

The Xen Project reports: The XENDOMCTLmemorymapping hypercall allows long running operations without implementing preemption. This hypercall is used by the device model as part of the emulation associated with configuration of PCI devices passed through to HVM guests and is therefore indirectly...

CVE-2014-5149

Certain MMU virtualization operations in Xen 4.2.x through 4.4.x, when using shadow pagetables, are not preemptible, which allows local HVM guest to cause a denial of service vcpu consumption by invoking these operations, which process every page assigned to a guest, a different vulnerability tha...