xen-kernel -- x86: Privilege escalation in PV guests

The Xen Project reports: The PV pagetable code has fast-paths for making updates to pre-existing pagetable entries, to skip expensive re-validation in safe cases e.g. clearing only Access/Dirty bits. The bits considered safe were too broad, and not actually safe. A malicious PV guest administrato...

Security update for qemu (important)

qemu was updated to fix 29 security issues. These security issues were fixed: - CVE-2016-4439: Avoid OOB access in 53C9X emulation bsc980711 - CVE-2016-4441: Avoid OOB access in 53C9X emulation bsc980723 - CVE-2016-4952: Avoid OOB access in Vmware PV SCSI emulation bsc981266 - CVE-2015-8817: Avoi...

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...

SUSE SLED12 / SLES12 Security Update : qemu (SUSE-SU-2016:1560-1)

qemu was updated to fix 37 security issues. These security issues were fixed : - CVE-2016-4439: Avoid OOB access in 53C9X emulation bsc980711 - CVE-2016-4441: Avoid OOB access in 53C9X emulation bsc980723 - CVE-2016-4952: Avoid OOB access in Vmware PV SCSI emulation bsc981266 - CVE-2015-8817: Avo...

USN-2997-1: Linux kernel (OMAP4) vulnerabilities

Jann Horn discovered that eCryptfs improperly attempted to use the mmap handler of a lower filesystem that did not implement one, causing a recursive page fault to occur. A local unprivileged attacker could use to cause a denial of service system crash or possibly execute arbitrary code with...

Ubuntu 12.04 LTS : linux vulnerabilities (USN-2996-1)

Jann Horn discovered that eCryptfs improperly attempted to use the mmap handler of a lower filesystem that did not implement one, causing a recursive page fault to occur. A local unprivileged attacker could use to cause a denial of service system crash or possibly execute arbitrary code with...

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...

Ubuntu 12.04 LTS : linux-lts-trusty vulnerabilities (USN-2968-2)

USN-2968-1 fixed vulnerabilities in the Linux kernel for Ubuntu 14.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement HWE kernel from Ubuntu 14.04 LTS for Ubuntu 12.04 LTS. Ralf Spenneberg discovered that the Aiptek Tablet USB device driver in the Linux kerne...

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...

DSA-3554-1 xen - security update

Bulletin has no description...

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...

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...

CVE-2016-3961

Xen and the Linux kernel through 4.5.x do not properly suppress hugetlbfs support in x86 PV guests, which allows local PV guest OS users to cause a denial of service guest OS crash by attempting to access a hugetlbfs mapped area...

Design/Logic Flaw

Xen and the Linux kernel through 4.5.x do not properly suppress hugetlbfs support in x86 PV guests, which allows local PV guest OS users to cause a denial of service guest OS crash by attempting to access a hugetlbfs mapped area...

CVE-2016-3961

Xen and the Linux kernel through 4.5.x do not properly suppress hugetlbfs support in x86 PV guests, which allows local PV guest OS users to cause a denial of service guest OS crash by attempting to access a hugetlbfs mapped area...

CVE-2016-3961

Xen and the Linux kernel through 4.5.x do not properly suppress hugetlbfs support in x86 PV guests, which allows local PV guest OS users to cause a denial of service guest OS crash by attempting to access a hugetlbfs mapped area...

CVE-2016-3961

Xen and the Linux kernel through 4.5.x do not properly suppress hugetlbfs support in x86 PV guests, which allows local PV guest OS users to cause a denial of service guest OS crash by attempting to access a hugetlbfs mapped area...

Double free

Xen, when used on a system providing PV backends, allows local guest OS administrators to cause a denial of service host OS crash or gain privileges by writing to memory shared between the frontend and backend, aka a double fetch vulnerability...

hugetlbfs use may crash PV Linux guests

ISSUE DESCRIPTION Huge 2Mb pages are generally unavailable to PV guests. Since x86 Linux pvops-based kernels are generally multi purpose, they would normally be built with hugetlbfs support enabled. Use of that functionality by an application in a PV guest would cause an infinite page fault loop,...