CVE-2015-7972

The 1 libxlsetmemorytarget function in tools/libxl/libxl.c and 2 libxlbuildpost function in tools/libxl/libxldom.c in Xen 3.4.x through 4.6.x do not properly calculate the balloon size when using the populate-on-demand PoD system, which allows local HVM guest users to cause a denial of service...

CVE-2015-7972

The 1 libxlsetmemorytarget function in tools/libxl/libxl.c and 2 libxlbuildpost function in tools/libxl/libxldom.c in Xen 3.4.x through 4.6.x do not properly calculate the balloon size when using the populate-on-demand PoD system, which allows local HVM guest users to cause a denial of service...

CVE-2015-7970

The p2mpodemergencysweep function in arch/x86/mm/p2m-pod.c in Xen 3.4.x, 3.5.x, and 3.6.x is not preemptible, which allows local x86 HVM guest administrators to cause a denial of service CPU consumption and possibly reboot via crafted memory contents that triggers a "time-consuming linear scan,"...

CVE-2015-7972

The 1 libxlsetmemorytarget function in tools/libxl/libxl.c and 2 libxlbuildpost function in tools/libxl/libxldom.c in Xen 3.4.x through 4.6.x do not properly calculate the balloon size when using the populate-on-demand PoD system, which allows local HVM guest users to cause a denial of service...

x86: Long latency populate-on-demand operation is not preemptible

ISSUE DESCRIPTION When running an HVM domain in Populate-on-Demand mode, Xen would sometimes search the domain for memory to reclaim, in response to demands for population of other pages in the same domain. This search runs without preemption. The guest can, by suitable arrangement of its memory...

x86: populate-on-demand balloon size inaccuracy can crash guests

ISSUE DESCRIPTION The design of the memory populate-on-demand PoD system requires that a guest's memory ballooning driver reach its memory reduction target. The target is not entirely well-defined in terms of the information visible to the appropriate parts of the system, so some unknown set of...

xen-kernel -- Long latency populate-on-demand operation is not preemptible

The Xen Project reports: When running an HVM domain in Populate-on-Demand mode, Xen would sometimes search the domain for memory to reclaim, in response to demands for population of other pages in the same domain. This search runs without preemption. The guest can, by suitable arrangement of its...

Vulnerability in Citrix XenServer Could Result in Information Disclosure (CTX201717)

A vulnerability has been identified in Citrix XenServer which could, if exploited, allow a malicious administrator of an HVM guest VM to obtain meta-data about their own VM. Citrix is presently unaware of any meta-data that might be leaked that would be of value to a malicious guest administrator...

Citrix XenServer Security Update for CVE-2015-5154 (CTX201593)

A security vulnerability has been identified in Citrix XenServer that may allow a malicious administrator of an HVM guest VM to compromise the host. This vulnerability affects all currently supported versions of Citrix XenServer up to and including Citrix XenServer 6.5 Service Pack 1...

CVE-2015-5166

Use-after-free vulnerability in QEMU in Xen 4.5.x and earlier does not completely unplug emulated block devices, which allows local HVM guest users to gain privileges by unplugging a block device twice...

CVE-2015-5166

Use-after-free vulnerability in QEMU in Xen 4.5.x and earlier does not completely unplug emulated block devices, which allows local HVM guest users to gain privileges by unplugging a block device twice...

Design/Logic Flaw

Use-after-free vulnerability in QEMU in Xen 4.5.x and earlier does not completely unplug emulated block devices, which allows local HVM guest users to gain privileges by unplugging a block device twice...

CVE-2015-5166

Use-after-free vulnerability in QEMU in Xen 4.5.x and earlier does not completely unplug emulated block devices, which allows local HVM guest users to gain privileges by unplugging a block device twice...

CVE-2015-5166

Use-after-free vulnerability in QEMU in Xen 4.5.x and earlier does not completely unplug emulated block devices, which allows local HVM guest users to gain privileges by unplugging a block device twice...

CVE-2015-5166

CVE-2015-5166: Use-after-free in QEMU/Xen block unplug protocol. Affects QEMU used by Xen 4.5.x and earlier; local HVM guest users can gain privileges by unplugging a block device twice due to incomplete unplug handling. No explicit remediation details in the provided connected docs; patch availa...

CVE-2015-5166

Use-after-free vulnerability in QEMU in Xen 4.5.x and earlier does not completely unplug emulated block devices, which allows local HVM guest users to gain privileges by unplugging a block device twice...

Use after free in QEMU/Xen block unplug protocol

ISSUE DESCRIPTION When unplugging an emulated block device the device was not fully unplugged, meaning a second unplug attempt would attempt to unplug the device a second time using a previously freed pointer. IMPACT An HVM guest which has access to an emulated IDE disk device may be able to...

qemu, xen-tools -- use-after-free in QEMU/Xen block unplug protocol

The Xen Project reports: When unplugging an emulated block device the device was not fully unplugged, meaning a second unplug attempt would attempt to unplug the device a second time using a previously freed pointer. An HVM guest which has access to an emulated IDE disk device may be able to...

Xen Patches VM Escape Flaw

The Xen Project has patched a serious vulnerability that could allow an attacker in a guest virtual machine to escape and gain the ability to run arbitrary code on the host machine. The vulnerability is in the QEMU open source machine emulator that ships as part of the Xen hypervisor. The problem...

QEMU heap overflow flaw while processing certain ATAPI commands.

ISSUE DESCRIPTION The QEMU security team has predisclosed the following advisory: A heap overflow flaw was found in the way QEMU's IDE subsystem handled I/O buffer access while processing certain ATAPI commands. A privileged guest user in a guest with CDROM drive enabled could potentially use thi...