868 matches found
virtio: unbounded memory allocation issue
ISSUE DESCRIPTION A guest can submit virtio requests without bothering to wait for completion and is therefore not bound by virtqueue size. This requires reusing vring descriptors in more than one request, which is incorrect but possible. Processing a request allocates a VirtQueueElement and...
Xen security advisories XSA-1 8 2, and XSA-1 8 3-may be caused by a virtual machine penetration-vulnerability warning-the black bar safety net
Today the Xen Update 2 important patch announcement XSA-1 8 2, and XSA-1 8 3,wherein the XSA-1 8 2 can be caused directly by the virtual machine penetration,recommends the use of Xen PV mode the Cloud Platform as soon as possible to update the patch. XSA-1 8 2 description of the problem: Xen PV...
FreeBSD : xen-kernel -- x86 shadow pagetables: address width overflow (d51ced72-4212-11e6-942d-bc5ff45d0f28)
The Xen Project reports : In the x86 shadow pagetable code, the guest frame number of a superpage mapping is stored in a 32-bit field. If a shadowed guest can cause a superpage mapping of a guest-physical address at or above 2^44 to be shadowed, the top bits of the address will be lost, causing a...
Unrestricted qemu logging
ISSUE DESCRIPTION When the libxl toolstack launches qemu for HVM guests, it pipes the output of stderr to a file in /var/log/xen. This output is not rate-limited in any way. The guest can easily cause qemu to print messages to stderr, causing this file to become arbitrarily large. IMPACT The disk...
xen-tools -- Unrestricted qemu logging
The Xen Project reports: When the libxl toolstack launches qemu for HVM guests, it pipes the output of stderr to a file in /var/log/xen. This output is not rate-limited in any way. The guest can easily cause qemu to print messages to stderr, causing this file to become arbitrarily large. The disk...
QEMU: Banked access to VGA memory (VBE) uses inconsistent bounds checks
ISSUE DESCRIPTION Qemu VGA module allows banked access to video memory using the window at 0xa00000 and it supports different access modes with different address calculations. But an attacker can easily change access modes after setting the bank register. This is CVE-2016-3710. Qemu VGA module...
Debian DSA-3554-1 : xen - security update
Multiple vulnerabilities have been discovered in the Xen hypervisor. The Common Vulnerabilities and Exposures project identifies the following problems : - CVE-2016-3158, CVE-2016-3159 XSA-172 Jan Beulich from SUSE discovered that Xen does not properly handle writes to the hardware FSW.ES bit whe...
Debian Security Advisory DSA 3554-1 (xen - security update)
Multiple vulnerabilities have been discovered in the Xen hypervisor. The Common Vulnerabilities and Exposures project identifies the following problems: CVE-2016-3158, CVE-2016-3159 XSA-172 Jan Beulich from SUSE discovered that Xen does not properly handle writes to the hardware FSW.ES bit when...
DSA-3554-1 xen - security update
Bulletin has no description...
x86 shadow pagetables: address width overflow
ISSUE DESCRIPTION In the x86 shadow pagetable code, the guest frame number of a superpage mapping is stored in a 32-bit field. If a shadowed guest can cause a superpage mapping of a guest-physical address at or above 2^44 to be shadowed, the top bits of the address will be lost, causing an...
xen-kernel -- x86 shadow pagetables: address width overflow
The Xen Project reports: In the x86 shadow pagetable code, the guest frame number of a superpage mapping is stored in a 32-bit field. If a shadowed guest can cause a superpage mapping of a guest-physical address at or above 2^44 to be shadowed, the top bits of the address will be lost, causing an...
Buffer overflow
Buffer overflow in hw/pt-msi.c in Xen 4.6.x and earlier, when using the qemu-xen-traditional aka qemu-dm device model, allows local x86 HVM guest administrators to gain privileges by leveraging a system with access to a passed-through MSI-X capable physical PCI device and MSI-X table entries,...
CVE-2015-8554
Buffer overflow in hw/pt-msi.c in Xen 4.6.x and earlier, when using the qemu-xen-traditional aka qemu-dm device model, allows local x86 HVM guest administrators to gain privileges by leveraging a system with access to a passed-through MSI-X capable physical PCI device and MSI-X table entries,...
UBUNTU-CVE-2015-8554
Buffer overflow in hw/pt-msi.c in Xen 4.6.x and earlier, when using the qemu-xen-traditional aka qemu-dm device model, allows local x86 HVM guest administrators to gain privileges by leveraging a system with access to a passed-through MSI-X capable physical PCI device and MSI-X table entries,...
CVE-2015-8554
Buffer overflow in hw/pt-msi.c in Xen 4.6.x and earlier, when using the qemu-xen-traditional aka qemu-dm device model, allows local x86 HVM guest administrators to gain privileges by leveraging a system with access to a passed-through MSI-X capable physical PCI device and MSI-X table entries,...
CVE-2015-8554
Buffer overflow in hw/pt-msi.c in Xen 4.6.x and earlier, when using the qemu-xen-traditional aka qemu-dm device model, allows local x86 HVM guest administrators to gain privileges by leveraging a system with access to a passed-through MSI-X capable physical PCI device and MSI-X table entries,...
broken AMD FPU FIP/FDP/FOP leak workaround
ISSUE DESCRIPTION There is a workaround in Xen to deal with the fact that AMD CPUs don't load the x86 registers FIP and possibly FCS, FDP and possibly FDS, and FOP from memory via XRSTOR or FXRSTOR when there is no pending unmasked exception. See XSA-52. However, this workaround does not cover al...
FreeBSD : xen-kernel -- VMX: guest user mode may crash guest with non-canonical RIP (81f9d6a4-ddaf-11e5-b2bd-002590263bf5)
The Xen Project reports : VMX refuses attempts to enter a guest with an instruction pointer which doesn't satisfy certain requirements. In particular, the instruction pointer needs to be canonical when entering a guest currently in 64-bit mode. This is the case even if the VM entry information...
