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...

FreeBSD : xen-tools -- HVM qemu unexpectedly enabling emulated VGA graphics backends (0d732fd1-27e0-11e5-a4a5-002590263bf5)

The Xen Project reports : When instantiating an emulated VGA device for an x86 HVM guest qemu will by default enable a backend to expose that device, either SDL or VNC depending on the version of qemu and the build time configuration. The libxl toolstack library does not explicitly disable these...

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...

Heap overflow in QEMU PCNET controller, allowing guest->host escape

ISSUE DESCRIPTION The QEMU security team has predisclosed the following advisory: pcnettransmit loads a transmit-frame descriptor from the guest into the /tmd/ local variable to recover a length field, a status field and a guest-physical location of the associated frame buffer. If the status fiel...

CVE-2015-4106

QEMU does not properly restrict write access to the PCI config space for certain PCI pass-through devices, which might allow local x86 HVM guests to gain privileges, cause a denial of service host crash, obtain sensitive information, or possibly have other unspecified impact via unknown vectors...

CVE-2015-4106

QEMU does not properly restrict write access to the PCI config space for certain PCI pass-through devices, which might allow local x86 HVM guests to gain privileges, cause a denial of service host crash, obtain sensitive information, or possibly have other unspecified impact via unknown vectors...

CVE-2015-4105

Xen 3.3.x through 4.5.x enables logging for PCI MSI-X pass-through error messages, which allows local x86 HVM guests to cause a denial of service host disk consumption via certain invalid operations...

CVE-2015-4105

Xen 3.3.x through 4.5.x enables logging for PCI MSI-X pass-through error messages, which allows local x86 HVM guests to cause a denial of service host disk consumption via certain invalid operations...

CVE-2015-4104

Xen 3.3.x through 4.5.x does not properly restrict access to PCI MSI mask bits, which allows local x86 HVM guest users to cause a denial of service unexpected interrupt and host crash via unspecified vectors...

CVE-2015-4104

Xen 3.3.x through 4.5.x does not properly restrict access to PCI MSI mask bits, which allows local x86 HVM guest users to cause a denial of service unexpected interrupt and host crash via unspecified vectors...

CVE-2015-4103

Xen 3.3.x through 4.5.x does not properly restrict write access to the host MSI message data field, which allows local x86 HVM guest administrators to cause a denial of service host interrupt handling confusion via vectors related to qemu and accessing spanning multiple fields...

Code injection

Xen 3.3.x through 4.5.x does not properly restrict access to PCI MSI mask bits, which allows local x86 HVM guest users to cause a denial of service unexpected interrupt and host crash via unspecified vectors...

Design/Logic Flaw

QEMU does not properly restrict write access to the PCI config space for certain PCI pass-through devices, which might allow local x86 HVM guests to gain privileges, cause a denial of service host crash, obtain sensitive information, or possibly have other unspecified impact via unknown vectors...

Type confusion

Xen 3.3.x through 4.5.x does not properly restrict write access to the host MSI message data field, which allows local x86 HVM guest administrators to cause a denial of service host interrupt handling confusion via vectors related to qemu and accessing spanning multiple fields...

CVE-2015-4103

Xen 3.3.x through 4.5.x does not properly restrict write access to the host MSI message data field, which allows local x86 HVM guest administrators to cause a denial of service host interrupt handling confusion via vectors related to qemu and accessing spanning multiple fields...