QEMU, as used in Xen 3.3.x through 4.5.x, does not properly restrict access to PCI command registers, which might allow local HVM guest 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 then accessing the device, which triggers an Unsupported Request (UR) response.
openSUSE 13.1 openSUSE 13.2 SUSE Linux Enterprise Desktop 11 SP3 SUSE Linux Enterprise Desktop 11 SP4 SUSE Linux Enterprise Desktop 12 SUSE Linux Enterprise Desktop 12 SP1 SUSE Linux Enterprise Server 11 SP1 for Teradata SUSE Linux Enterprise Server 11 SP1 LTSS SUSE Linux Enterprise Server 11 SP1-LTSS SUSE Linux Enterprise Server 11 SP1-TERADATA SUSE Linux Enterprise Server 11 SP2 LTSS SUSE Linux Enterprise Server 11 SP2-LTSS SUSE Linux Enterprise Server 11 SP3 SUSE Linux Enterprise Server 11 SP3 for Teradata SUSE Linux Enterprise Server 11 SP3-TERADATA SUSE Linux Enterprise Server 11 SP4 SUSE Linux Enterprise Server 12 SUSE Linux Enterprise Server 12 SP1 SUSE Linux Enterprise Server for SAP Applications 11 SP1-LTSS SUSE Linux Enterprise Server for SAP Applications 11 SP1-TERADATA SUSE Linux Enterprise Server for SAP Applications 11 SP2-LTSS SUSE Linux Enterprise Server for SAP Applications 11 SP3 SUSE Linux Enterprise Server for SAP Applications 11 SP3-TERADATA SUSE Linux Enterprise Server for SAP Applications 11 SP4 SUSE Linux Enterprise Server for SAP Applications 12 SUSE Linux Enterprise Server for SAP Applications 12 SP1 SUSE Linux Enterprise Software Development Kit 11 SP3 SUSE Linux Enterprise Software Development Kit 11 SP4 SUSE Linux Enterprise Software Development Kit 12 SUSE Linux Enterprise Software Development Kit 12 SP1