DEBIAN-CVE-2018-18883

An issue was discovered in Xen 4.9.x through 4.11.x, on Intel x86 platforms, allowing x86 HVM and PVH guests to cause a host OS denial of service NULL pointer dereference or possibly have unspecified other impact because nested VT-x is not properly restricted...

x86: Incorrect MSR_DEBUGCTL handling lets guests enable BTS

ISSUE DESCRIPTION The DEBUGCTL MSR contains several debugging features, some of which virtualise cleanly, but some do not. In particular, Branch Trace Store is not virtualised by the processor, and software has to be careful to configure it suitably not to lock up the core. As a result, it must...

CVE-2018-12893

An issue was discovered in Xen through 4.10.x. One of the fixes in XSA-260 added some safety checks to help prevent Xen livelocking with debug exceptions. Unfortunately, due to an oversight, at least one of these safety checks can be triggered by a guest. A malicious PV guest can crash Xen, leadi...

Fedora 27 : xen (2018-c553a586c8)

add Xen page-table isolation XPTI mitigation and Branch Target Injection BTI mitigation for XSA-254 DoS via non-preemptable L3/L4 pagetable freeing XSA-252 1549568 grant table v2 - v1 transition may crash Xen XSA-255 1549570 x86 PVH guest without LAPIC may DoS the host XSA-256 1549572 Note that...

Debian DSA-4131-1 : xen - security update

Multiple vulnerabilities have been discovered in the Xen hypervisor : - CVE-2018-7540 Jann Horn discovered that missing checks in page table freeing may result in denial of service. - CVE-2018-7541 Jan Beulich discovered that incorrect error handling in grant table checks may result in...

CVE-2018-7542

An issue was discovered in Xen 4.8.x through 4.10.x allowing x86 PVH guest OS users to cause a denial of service NULL pointer dereference and hypervisor crash by leveraging the mishandling of configurations that lack a Local APIC...

CVE-2018-7542

An issue was discovered in Xen 4.8.x through 4.10.x allowing x86 PVH guest OS users to cause a denial of service NULL pointer dereference and hypervisor crash by leveraging the mishandling of configurations that lack a Local APIC...

Null pointer dereference

An issue was discovered in Xen 4.8.x through 4.10.x allowing x86 PVH guest OS users to cause a denial of service NULL pointer dereference and hypervisor crash by leveraging the mishandling of configurations that lack a Local APIC...

CVE-2018-7542

An issue was discovered in Xen 4.8.x through 4.10.x allowing x86 PVH guest OS users to cause a denial of service NULL pointer dereference and hypervisor crash by leveraging the mishandling of configurations that lack a Local APIC...

CVE-2018-7542

An issue was discovered in Xen 4.8.x through 4.10.x allowing x86 PVH guest OS users to cause a denial of service NULL pointer dereference and hypervisor crash by leveraging the mishandling of configurations that lack a Local APIC...

x86 PVH guest without LAPIC may DoS the host

ISSUE DESCRIPTION So far, x86 PVH guests can be configured with or without Local APICs. Configurations with Local APICs are identical to x86 HVM guests, and will use as much hardware acceleration support as possible. Configurations without Local APICs try to turn off all hardware acceleration, an...