Important: Red Hat Security Advisory: virtio-win security and bug fix update

An updated virtio-win package that fixes one security issue and two bugs is now available for Red Hat Enterprise Linux 6 Supplementary. Red Hat Product Security has rated this update as having Important security impact. A Common Vulnerability Scoring System CVSS base score, which gives a detailed...

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...

UBUNTU-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...

PCI MSI mask bits inadvertently exposed to guests

ISSUE DESCRIPTION The mask bits optionally available in the PCI MSI capability structure are used by the hypervisor to occasionally suppress interrupt delivery. Unprivileged guests were, however, nevertheless allowed direct control of these bits. IMPACT Interrupts may be observed by Xen at...

Guest triggerable qemu MSI-X pass-through error messages

ISSUE DESCRIPTION Device model code dealing with guest PCI MSI-X interrupt management activities logs messages on certain supposedly invalid guest operations. IMPACT A buggy or malicious guest repeatedly invoking such operations may result in the host disk to fill up, possibly leading to a Denial...

Unmediated PCI register access in qemu

ISSUE DESCRIPTION Qemu allows guests to not only read, but also write all parts of the PCI config space but not extended config space of passed through PCI devices not explicitly dealt with for partial emulation purposes. IMPACT Since the effect depends on the specific purpose of the the config...

Potential unintended writes to host MSI message data field via qemu

ISSUE DESCRIPTION Logic is in place to avoid writes to certain host config space fields when the guest must nevertheless be able to access their virtual counterparts. A bug in how this logic deals with accesses spanning multiple fields allows the guest to write to the host MSI message data field...

xen-tools -- Unmediated PCI register access in qemu

The Xen Project reports: Qemu allows guests to not only read, but also write all parts of the PCI config space but not extended config space of passed through PCI devices not explicitly dealt with for partial emulation purposes. Since the effect depends on the specific purpose of the the config...

xen-tools -- Guest triggerable qemu MSI-X pass-through error messages

The Xen Project reports: Device model code dealing with guest PCI MSI-X interrupt management activities logs messages on certain supposedly invalid guest operations. A buggy or malicious guest repeatedly invoking such operations may result in the host disk to fill up, possibly leading to a Denial...

xen-tools -- PCI MSI mask bits inadvertently exposed to guests

The Xen Project reports: The mask bits optionally available in the PCI MSI capability structure are used by the hypervisor to occasionally suppress interrupt delivery. Unprivileged guests were, however, nevertheless allowed direct control of these bits. Interrupts may be observed by Xen at...

USN-2614-1: Linux kernel vulnerabilities

Vincent Tondellier discovered an integer overflow in the Linux kernel's netfilter connection tracking accounting of loaded extensions. An attacker on the local area network LAN could potential exploit this flaw to cause a denial of service system crash of targeted system. CVE-2014-9715 Jan Beulic...

SUSE SLED12 / SLES12 Security Update : xen (SUSE-SU-2015:0701-1)

Xen was updated 4.4.201 to address three security issues and functional bugs. The following vulnerabilities were fixed : - Long latency MMIO mapping operations are not preemptible XSA-125, CVE-2015-2752, bnc922705 - Unmediated PCI command register access in qemu XSA-126, CVE-2015-2756, bnc922706 ...

SUSE SLED12 / SLES12 Security Update : Security Update for Linux Kernel (SUSE-SU-2015:0658-1)

The SUSE Linux Enterprise Server 12 kernel was updated to 3.12.39 to receive various security and bugfixes. Following security bugs were fixed : - CVE-2015-0777: The XEN usb backend could leak information to the guest system due to copying uninitialized memory. - CVE-2015-2150: Xen and the Linux...

SUSE SLED10 / SLES10 Security Update : kernel (SUSE-SU-2013:0674-1)

This Linux kernel update fixes various security issues and bugs in the SUSE Linux Enterprise 10 SP4 kernel. The following security issues have been fixed : CVE-2013-0871: A race condition in ptrace2 could be used by local attackers to crash the kernel and/or execute code in kernel context...

SUSE SLED11 / SLES11 Security Update : Xen (SUSE-SU-2015:0747-1)

The Virtualization service XEN was updated to fix various bugs and security issues. The following security issues have been fixed : CVE-2015-2756: XSA-126: Unmediated PCI command register access in qemu could have lead to denial of service attacks against the host, if PCI cards are passed through...

SUSE SLES11 Security Update : Xen (SUSE-SU-2015:0745-1)

The Virtualization service XEN was updated to fix various bugs and security issues. The following security issues have been fixed : CVE-2015-2756: XSA-126: Unmediated PCI command register access in qemu could have lead to denial of service attacks against the host, if PCI cards are passed through...

libvirt / qemu security vulnerabilities

Crash on PCI registers, IDE controller and Physical Region Descriptor Table decoder. Code execution...

OracleVM 3.2 : xen (OVMSA-2015-0058) (Venom)

The remote OracleVM system is missing necessary patches to address critical security updates : - force the fifo access to be in bounds of the allocated buffer This is CVE-2015-3456. bug 21078935 CVE-2015-3456 - xen: limit guest control of PCI command register Otherwise the guest can abuse that...