PT-2015-6138 · Linux +3 · Linux Kernel +3

Name of the Vulnerable Software and Affected Versions: Linux kernel versions prior to 4.1.6 Description: The issue allows local users to gain privileges by triggering an NMI within a certain instruction window due to improper reliance on espfix64 during nested NMI processing in arch/x86/entry/ent...

FreeBSD : xen-tools -- PCI MSI mask bits inadvertently exposed to guests (4db8a0f4-27e9-11e5-a4a5-002590263bf5)

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...

FreeBSD : xen-tools -- Potential unintended writes to host MSI message data field via qemu (af38cfec-27e7-11e5-a4a5-002590263bf5)

The Xen Project reports : 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 dat...

kernel: int80 fork from 64-bit tasks mishandling

A flaw was found in the way the Linux kernel's 32-bit emulation implementation handled forking or closing of a task with an 'int80' entry. A local user could potentially use this flaw to escalate their privileges on the system...

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...

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...

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...

UBUNTU-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...

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 -- 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...

xen-tools -- Potential unintended writes to host MSI message data field via qemu

The Xen Project reports: 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...

SUSE SLES11 Security Update : xen (SUSE-SU-2014:1732-1)

xen was updated to fix 10 security issues : - Guest effectable page reference leak in MMUMACHPHYSUPDATE handling CVE-2014-9030. - Insufficient bounding of 'REP MOVS' to MMIO emulated inside the hypervisor CVE-2014-8867. - Missing privilege level checks in x86 emulation of far branches...

Command injection

Xen 3.3.x through 4.5.x and the Linux kernel through 3.19.1 do not properly restrict access to PCI command registers, which might allow local guest OS users to cause a denial of service non-maskable interrupt and host crash by disabling the 1 memory or 2 I/O decoding for a PCI Express device and...

UBUNTU-CVE-2015-2150

Xen 3.3.x through 4.5.x and the Linux kernel through 3.19.1 do not properly restrict access to PCI command registers, which might allow local guest OS users to cause a denial of service non-maskable interrupt and host crash by disabling the 1 memory or 2 I/O decoding for a PCI Express device and...

arm: vgic-v2: GICD_SGIR is not properly emulated

ISSUE DESCRIPTION When decoding a guest write to a specific register in the virtual interrupt controller Xen would treat an invalid value as a critical error and crash the host. IMPACT By writing an invalid value to the GICD.SGIR register a guest can crash the host, resulting in a Denial of Servi...

Xen Resource Management Error Vulnerability

Xen is an open source virtual machine monitor product developed at the University of Cambridge, UK. The product enables different and incompatible operating systems to run on the same computer and supports runtime migration to ensure uptime and avoid downtime. A security vulnerability exists in t...

DEBIAN-CVE-2015-1563

The ARM GIC distributor virtualization in Xen 4.4.x and 4.5.x allows local guests to cause a denial of service by causing a large number messages to be logged...

UBUNTU-CVE-2014-9322

arch/x86/kernel/entry64.S in the Linux kernel before 3.17.5 does not properly handle faults associated with the Stack Segment SS segment register, which allows local users to gain privileges by triggering an IRET instruction that leads to access to a GS Base address from the wrong space...

OracleVM 3.1 : xen (OVMSA-2013-0001)

The remote OracleVM system is missing necessary patches to address critical security updates : - VT-d: fix interrupt remapping source validation for devices behind legacy bridges Using SVTVERIFYBUS here doesn't make sense native Linux also uses SVTVERIFYSIDSQ here instead. CVE-2012-5634 - When xe...