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 assertion failure or NULL dereference later on, in code that removes the shadow.

A HVM guest using shadow pagetables can cause the host to crash.

A PV guest using shadow pagetables (i.e. being migrated) with PV superpages enabled (which is not the default) can crash the host, or corrupt hypervisor memory, and so a privilege escalation cannot be ruled out.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Integer overflow in the x86 shadow pagetable code in Xen allows local guest OS users to cause a denial of     service (host crash) or possibly gain privileges by shadowing a superpage mapping. (CVE-2016-3960)

Note that Nessus relies on the presence of the package as reported by the vendor.

x86 shadow pagetables: address width overflow [XSA-173, CVE-2016-3960] Qemu: net: buffer overflow in stellaris_enet emulator [CVE-2016-4001] Qemu: net: buffer overflow in MIPSnet emulator [CVE-2016-4002] qemu:
Infinite loop vulnerability in usb_ehci using siTD process [CVE-2016-4037]

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote OracleVM system is missing necessary patches to address critical security updates : please see Oracle VM Security Advisory OVMSA-2016-0081 for details.

This update for xen fixes the several issues. These security issues were fixed :

  - CVE-2014-3672: The qemu implementation in libvirt Xen     allowed local guest OS users to cause a denial of     service (host disk consumption) by writing to stdout or     stderr (bsc#981264).

  - CVE-2016-3158: The xrstor function did not properly     handle writes to the hardware FSW.ES bit when running on     AMD64 processors, which allowed local guest OS users to     obtain sensitive register content information from     another guest by leveraging pending exception and mask     bits (bsc#973188).

  - CVE-2016-3159: The fpu_fxrstor function in     arch/x86/i387.c did not properly handle writes to the     hardware FSW.ES bit when running on AMD64 processors,     which allowed local guest OS users to obtain sensitive     register content information from another guest by     leveraging pending exception and mask bits (bsc#973188).

  - CVE-2016-3710: The VGA module improperly performed     bounds checking on banked access to video memory, which     allowed local guest OS administrators to execute     arbitrary code on the host by changing access modes     after setting the bank register, aka the 'Dark Portal'     issue (bsc#978164).

  - CVE-2016-3960: Integer overflow in the x86 shadow     pagetable code allowed local guest OS users to cause a     denial of service (host crash) or possibly gain     privileges by shadowing a superpage mapping     (bsc#974038).

  - CVE-2016-4001: Buffer overflow in the     stellaris_enet_receive function, when the Stellaris     ethernet controller is configured to accept large     packets, allowed remote attackers to cause a denial of     service (QEMU crash) via a large packet (bsc#975130).

  - CVE-2016-4002: Buffer overflow in the mipsnet_receive     function, when the guest NIC is configured to accept     large packets, allowed remote attackers to cause a     denial of service (memory corruption and QEMU crash) or     possibly execute arbitrary code via a packet larger than     1514 bytes (bsc#975138).

  - CVE-2016-4020: The patch_instruction function did not     initialize the imm32 variable, which allowed local guest     OS administrators to obtain sensitive information from     host stack memory by accessing the Task Priority     Register (TPR) (bsc#975907).

  - CVE-2016-4037: The ehci_advance_state function in     hw/usb/hcd-ehci.c allowed local guest OS administrators     to cause a denial of service (infinite loop and CPU     consumption) via a circular split isochronous transfer     descriptor (siTD) list (bsc#976111).

  - CVE-2016-4439: The esp_reg_write function in the 53C9X     Fast SCSI Controller (FSC) support did not properly     check command buffer length, which allowed local guest     OS administrators to cause a denial of service     (out-of-bounds write and QEMU process crash) or     potentially execute arbitrary code on the host via     unspecified vectors (bsc#980716).

  - CVE-2016-4441: The get_cmd function in the 53C9X Fast     SCSI Controller (FSC) support did not properly check DMA     length, which allowed local guest OS administrators to     cause a denial of service (out-of-bounds write and QEMU     process crash) via unspecified vectors, involving an     SCSI command (bsc#980724).

  - CVE-2016-4453: The vmsvga_fifo_run function allowed     local guest OS administrators to cause a denial of     service (infinite loop and QEMU process crash) via a VGA     command (bsc#982225).

  - CVE-2016-4454: The vmsvga_fifo_read_raw function allowed     local guest OS administrators to obtain sensitive host     memory information or cause a denial of service (QEMU     process crash) by changing FIFO registers and issuing a     VGA command, which triggered an out-of-bounds read     (bsc#982224).

  - CVE-2016-4952: Out-of-bounds access issue in     pvsci_ring_init_msg/data routines (bsc#981276).

  - CVE-2016-4962: The libxl device-handling allowed local     OS guest administrators to cause a denial of service     (resource consumption or management facility confusion)     or gain host OS privileges by manipulating information     in guest controlled areas of xenstore (bsc#979620).

  - CVE-2016-4963: The libxl device-handling allowed local     guest OS users with access to the driver domain to cause     a denial of service (management tool confusion) by     manipulating information in the backend directories in     xenstore (bsc#979670).

  - CVE-2016-5105: Stack information leakage while reading     configuration (bsc#982024).

  - CVE-2016-5106: Out-of-bounds write while setting     controller properties (bsc#982025).

  - CVE-2016-5107: Out-of-bounds read in     megasas_lookup_frame() function (bsc#982026).

  - CVE-2016-5126: Heap-based buffer overflow in the     iscsi_aio_ioctl function allowed local guest OS users to     cause a denial of service (QEMU process crash) or     possibly execute arbitrary code via a crafted iSCSI     asynchronous I/O ioctl call (bsc#982286).

  - CVE-2016-5238: The get_cmd function in hw/scsi/esp.c     might have allowed local guest OS administrators to     cause a denial of service (out-of-bounds write and QEMU     process crash) via vectors related to reading from the     information transfer buffer in non-DMA mode     (bsc#982960).

  - CVE-2016-5337: The megasas_ctrl_get_info function     allowed local guest OS administrators to obtain     sensitive host memory information via vectors related to     reading device control information (bsc#983973).

  - CVE-2016-5338: The (1) esp_reg_read and (2)     esp_reg_write functions allowed local guest OS     administrators to cause a denial of service (QEMU     process crash) or execute arbitrary code on the host via     vectors related to the information transfer buffer     (bsc#983984).

  - CVE-2016-6258: Potential privilege escalation in PV     guests (XSA-182) (bsc#988675).

  - bsc#978295: x86 software guest page walk PS bit handling     flaw (XSA-176)

  - CVE-2016-5403: virtio: unbounded memory allocation on     host via guest leading to DoS (XSA-184) (bsc#990923)

  - CVE-2016-6351: scsi: esp: OOB write access in esp_do_dma     (bsc#990843)

The update package also includes non-security fixes. See advisory for details.

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This update for xen fixes the following issues :

These security issues were fixed :

  - CVE-2016-7092: The get_page_from_l3e function in     arch/x86/mm.c in Xen allowed local 32-bit PV guest OS     administrators to gain host OS privileges via vectors     related to L3 recursive pagetables (bsc#995785)

  - CVE-2016-7093: Xen allowed local HVM guest OS     administrators to overwrite hypervisor memory and     consequently gain host OS privileges by leveraging     mishandling of instruction pointer truncation during     emulation (bsc#995789)

  - CVE-2016-7094: Buffer overflow in Xen allowed local x86     HVM guest OS administrators on guests running with     shadow paging to cause a denial of service via a     pagetable update (bsc#995792)

  - CVE-2016-7154: Use-after-free vulnerability in the FIFO     event channel code in Xen allowed local guest OS     administrators to cause a denial of service (host crash)     and possibly execute arbitrary code or obtain sensitive     information via an invalid guest frame number     (bsc#997731)

  - CVE-2016-6836: VMWARE VMXNET3 NIC device support was     leaging information leakage. A privileged user inside     guest could have used this to leak host memory bytes to     a guest (boo#994761)

  - CVE-2016-6888: Integer overflow in packet initialisation     in VMXNET3 device driver. A privileged user inside guest     could have used this flaw to crash the Qemu instance     resulting in DoS (bsc#994772)

  - CVE-2016-6833: Use-after-free issue in the VMWARE     VMXNET3 NIC device support. A privileged user inside     guest could have used this issue to crash the Qemu     instance resulting in DoS (boo#994775)

  - CVE-2016-6835: Buffer overflow in the VMWARE VMXNET3 NIC     device support, causing an OOB read access (bsc#994625)

  - CVE-2016-6834: A infinite loop during packet     fragmentation in the VMWARE VMXNET3 NIC device support     allowed privileged user inside guest to crash the Qemu     instance resulting in DoS (bsc#994421)

  - CVE-2016-6258: The PV pagetable code in arch/x86/mm.c in     Xen allowed local 32-bit PV guest OS administrators to     gain host OS privileges by leveraging fast-paths for     updating pagetable entries (bsc#988675)

  - CVE-2016-5403: The virtqueue_pop function in     hw/virtio/virtio.c in QEMU allowed local guest OS     administrators to cause a denial of service (memory     consumption and QEMU process crash) by submitting     requests without waiting for completion (boo#990923)

  - CVE-2016-6351: The esp_do_dma function in hw/scsi/esp.c,     when built with ESP/NCR53C9x controller emulation     support, allowed local guest OS administrators to cause     a denial of service (out-of-bounds write and QEMU     process crash) or execute arbitrary code on the host via     vectors involving DMA read into ESP command buffer     (bsc#990843)

  - CVE-2016-6258: The PV pagetable code in arch/x86/mm.c in     Xen allowed local 32-bit PV guest OS administrators to     gain host OS privileges by leveraging fast-paths for     updating pagetable entries (bsc#988675)

  - CVE-2016-5337: The megasas_ctrl_get_info function in     hw/scsi/megasas.c in QEMU allowed local guest OS     administrators to obtain sensitive host memory     information via vectors related to reading device     control information (bsc#983973)

  - CVE-2016-5338: The (1) esp_reg_read and (2)     esp_reg_write functions in hw/scsi/esp.c in QEMU allowed     local guest OS administrators to cause a denial of     service (QEMU process crash) or execute arbitrary code     on the QEMU host via vectors related to the information     transfer buffer (bsc#983984)

  - CVE-2016-5238: The get_cmd function in hw/scsi/esp.c in     QEMU allowed local guest OS administrators to cause a     denial of service (out-of-bounds write and QEMU process     crash) via vectors related to reading from the     information transfer buffer in non-DMA mode (bsc#982960)

  - CVE-2016-4453: The vmsvga_fifo_run function in     hw/display/vmware_vga.c in QEMU allowed local guest OS     administrators to cause a denial of service (infinite     loop and QEMU process crash) via a VGA command     (bsc#982225)

  - CVE-2016-4454: The vmsvga_fifo_read_raw function in     hw/display/vmware_vga.c in QEMU allowed local guest OS     administrators to obtain sensitive host memory     information or cause a denial of service (QEMU process     crash) by changing FIFO registers and issuing a VGA     command, which triggers an out-of-bounds read     (bsc#982224)

  - CVE-2016-5126: Heap-based buffer overflow in the     iscsi_aio_ioctl function in block/iscsi.c in QEMU     allowed local guest OS users to cause a denial of     service (QEMU process crash) or possibly execute     arbitrary code via a crafted iSCSI asynchronous I/O     ioctl call (bsc#982286)

  - CVE-2016-5105: The megasas_dcmd_cfg_read function in     hw/scsi/megasas.c in QEMU, when built with MegaRAID SAS     8708EM2 Host Bus Adapter emulation support, used an     uninitialized variable, which allowed local guest     administrators to read host memory via vectors involving     a MegaRAID Firmware Interface (MFI) command (bsc#982024)

  - CVE-2016-5106: The megasas_dcmd_set_properties function     in hw/scsi/megasas.c in QEMU, when built with MegaRAID     SAS 8708EM2 Host Bus Adapter emulation support, allowed     local guest administrators to cause a denial of service     (out-of-bounds write access) via vectors involving a     MegaRAID Firmware Interface (MFI) command (bsc#982025)

  - CVE-2016-5107: The megasas_lookup_frame function in     QEMU, when built with MegaRAID SAS 8708EM2 Host Bus     Adapter emulation support, allowed local guest OS     administrators to cause a denial of service     (out-of-bounds read and crash) via unspecified vectors     (bsc#982026)

  - CVE-2016-4963: The libxl device-handling allowed local     guest OS users with access to the driver domain to cause     a denial of service (management tool confusion) by     manipulating information in the backend directories in     xenstore (bsc#979670)

  - CVE-2016-4962: The libxl device-handling allowed local     OS guest administrators to cause a denial of service     (resource consumption or management facility confusion)     or gain host OS privileges by manipulating information     in guest controlled areas of xenstore (bsc#979620)

  - CVE-2016-4952: Out-of-bounds access issue in     pvsci_ring_init_msg/data routines (bsc#981276)

  - CVE-2014-3672: The qemu implementation in libvirt Xen     allowed local guest OS users to cause a denial of     service (host disk consumption) by writing to stdout or     stderr (bsc#981264)

  - CVE-2016-4441: The get_cmd function in the 53C9X Fast     SCSI Controller (FSC) support did not properly check DMA     length, which allowed local guest OS administrators to     cause a denial of service (out-of-bounds write and QEMU     process crash) via unspecified vectors, involving an     SCSI command (bsc#980724)

  - CVE-2016-4439: The esp_reg_write function in the 53C9X     Fast SCSI Controller (FSC) support did not properly     check command buffer length, which allowed local guest     OS administrators to cause a denial of service     (out-of-bounds write and QEMU process crash) or     potentially execute arbitrary code on the host via     unspecified vectors (bsc#980716)

  - CVE-2016-3710: The VGA module improperly performed     bounds checking on banked access to video memory, which     allowed local guest OS administrators to execute     arbitrary code on the host by changing access modes     after setting the bank register, aka the 'Dark Portal'     issue (bsc#978164)

  - CVE-2016-3960: Integer overflow in the x86 shadow     pagetable code allowed local guest OS users to cause a     denial of service (host crash) or possibly gain     privileges by shadowing a superpage mapping (bsc#974038)

  - CVE-2016-4037: The ehci_advance_state function in     hw/usb/hcd-ehci.c allowed local guest OS administrators     to cause a denial of service (infinite loop and CPU     consumption) via a circular split isochronous transfer     descriptor (siTD) list (bsc#976111)

  - CVE-2016-4020: The patch_instruction function did not     initialize the imm32 variable, which allowed local guest     OS administrators to obtain sensitive information from     host stack memory by accessing the Task Priority     Register (TPR) (bsc#975907)

  - CVE-2016-4001: Buffer overflow in the     stellaris_enet_receive function, when the Stellaris     ethernet controller is configured to accept large     packets, allowed remote attackers to cause a denial of     service (QEMU crash) via a large packet (bsc#975130)

  - CVE-2016-4002: Buffer overflow in the mipsnet_receive     function, when the guest NIC is configured to accept     large packets, allowed remote attackers to cause a     denial of service (memory corruption and QEMU crash) or     possibly execute arbitrary code via a packet larger than     1514 bytes (bsc#975138)

  - CVE-2016-3158: The xrstor function did not properly     handle writes to the hardware FSW.ES bit when running on     AMD64 processors, which allowed local guest OS users to     obtain sensitive register content information from     another guest by leveraging pending exception and mask     bits (bsc#973188)

  - CVE-2016-3159: The fpu_fxrstor function in     arch/x86/i387.c did not properly handle writes to the     hardware FSW.ES bit when running on AMD64 processors,     which allowed local guest OS users to obtain sensitive     register content information from another guest by     leveraging pending exception and mask bits (bsc#973188)

  - CVE-2016-4480: The guest_walk_tables function in     arch/x86/mm/guest_walk.c in Xen did not properly handle     the Page Size (PS) page table entry bit at the L4 and L3     page table levels, which might have allowed local guest     OS users to gain privileges via a crafted mapping of     memory (bsc#978295)

These non-security issues were fixed :

  - boo#991934: xen hypervisor crash in csched_acct 

  - boo#992224: [HPS Bug] During boot of Xen Hypervisor,     Failed to get contiguous memory for DMA from Xen 

  - boo#970135: new virtualization project clock test     randomly fails on Xen 

  - boo#971949 xl: Support (by ignoring) xl migrate --live.
    xl migrations are always live 

  - boo#990970: Add PMU support for Intel E7-8867 v4 (fam=6,     model=79) 

  - boo#985503: vif-route broken 

  - boo#978413: PV guest upgrade from sles11sp4 to sles12sp2     alpha3 failed on sles11sp4 xen host

  - boo#986586: out of memory (oom) during boot on 'modprobe     xenblk' (non xen kernel) 

  - boo#953339, boo#953362, boo#953518, boo#984981)     boo#953339, boo#953362, boo#953518, boo#984981:
    Implement SUSE specific unplug protocol for emulated PCI     devices in PVonHVM guests to qemu-xen-upstream 

  - boo#958848: HVM guest crash at /usr/src/packages/BUILD/     xen-4.4.2-testing/obj/default/balloon/balloon.c:407 

  - boo#982695: xen-4.5.2 qemu fails to boot HVM guest from     xvda 

  - boo#954872: script block-dmmd not working as expected 

  - boo#961600: L3: poor performance when Xen HVM domU     configured with max memory greater than current memory 

  - boo#979035: restore xm migrate fixes for boo#955399/     boo#955399 

  - boo#963161: Windows VM getting stuck during load while a     VF is assigned to it after upgrading to latest     maintenance updates boo#963161

  - boo#976058: Xen error running simple HVM guest (Post     Alpha 2 xen+qemu) 

  - boo#973631: AWS EC2 kdump issue 

  - boo#961100: Migrate a fv guest from sles12 to sles12sp1     on xen fails for 'Domain is not running on destination     host'. 

  - boo#964427: Discarding device blocks: failed -     Input/output error

This update for xen fixes several issues. These security issues were fixed :

  - CVE-2016-7094: Buffer overflow in Xen allowed local x86     HVM guest OS administrators on guests running with     shadow paging to cause a denial of service via a     pagetable update (bsc#995792)

  - CVE-2016-7092: The get_page_from_l3e function in     arch/x86/mm.c in Xen allowed local 32-bit PV guest OS     administrators to gain host OS privileges via vectors     related to L3 recursive pagetables (bsc#995785)

  - CVE-2016-6258: The PV pagetable code in arch/x86/mm.c in     Xen allowed local 32-bit PV guest OS administrators to     gain host OS privileges by leveraging fast-paths for     updating pagetable entries (bsc#988675)

  - CVE-2016-5338: The (1) esp_reg_read and (2)     esp_reg_write functions allowed local guest OS     administrators to cause a denial of service (QEMU     process crash) or execute arbitrary code on the host via     vectors related to the information transfer buffer     (bsc#983984)

  - CVE-2016-5238: The get_cmd function in hw/scsi/esp.c     might have allowed local guest OS administrators to     cause a denial of service (out-of-bounds write and QEMU     process crash) via vectors related to reading from the     information transfer buffer in non-DMA mode (bsc#982960)

  - CVE-2014-3672: The qemu implementation in libvirt Xen     allowed local guest OS users to cause a denial of     service (host disk consumption) by writing to stdout or     stderr (bsc#981264)

  - CVE-2016-4441: The get_cmd function in the 53C9X Fast     SCSI Controller (FSC) support did not properly check DMA     length, which allowed local guest OS administrators to     cause a denial of service (out-of-bounds write and QEMU     process crash) via unspecified vectors, involving an     SCSI command (bsc#980724)

  - CVE-2016-4439: The esp_reg_write function in the 53C9X     Fast SCSI Controller (FSC) support did not properly     check command buffer length, which allowed local guest     OS administrators to cause a denial of service     (out-of-bounds write and QEMU process crash) or     potentially execute arbitrary code on the host via     unspecified vectors (bsc#980716)

  - CVE-2016-3710: The VGA module improperly performed     bounds checking on banked access to video memory, which     allowed local guest OS administrators to execute     arbitrary code on the host by changing access modes     after setting the bank register, aka the 'Dark Portal'     issue (bsc#978164)

  - CVE-2016-4480: The guest_walk_tables function in     arch/x86/mm/guest_walk.c in Xen did not properly handle     the Page Size (PS) page table entry bit at the L4 and L3     page table levels, which might have allowed local guest     OS users to gain privileges via a crafted mapping of     memory (bsc#978295)

  - CVE-2016-3960: Integer overflow in the x86 shadow     pagetable code allowed local guest OS users to cause a     denial of service (host crash) or possibly gain     privileges by shadowing a superpage mapping (bsc#974038)

  - CVE-2016-3158: The xrstor function did not properly     handle writes to the hardware FSW.ES bit when running on     AMD64 processors, which allowed local guest OS users to     obtain sensitive register content information from     another guest by leveraging pending exception and mask     bits (bsc#973188)

  - CVE-2016-4001: Buffer overflow in the     stellaris_enet_receive function, when the Stellaris     ethernet controller is configured to accept large     packets, allowed remote attackers to cause a denial of     service (QEMU crash) via a large packet (bsc#975130)

  - CVE-2016-4002: Buffer overflow in the mipsnet_receive     function, when the guest NIC is configured to accept     large packets, allowed remote attackers to cause a     denial of service (memory corruption and QEMU crash) or     possibly execute arbitrary code via a packet larger than     1514 bytes (bsc#975138)

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Xen Project 报告：

在 x86 阴影页表代码中，superpage 映射的客户机帧号码存储在 32 位字段中。如果隐藏的客户机可在 2^44 或 2^44 以上造成客户机物理地址的 superpage 映射，将会丢失地址的最高位，进而造成断言失败，或之后在删除隐藏的代码中造成空取消引用。

使用阴影页表的 HVM 客户机可造成主机崩溃。

使用已启用 PV superpage（非默认）的阴影页表（即正被迁移）的 PV 客户机，可造成主机崩溃或管理程序内存损坏，因此无法排除权限升级。

Linux/Unix 主机中安装的一个或多个程序包受到一个漏洞影响，而供应商没有提供补丁程序。

  - Xen 中的 x86 阴影页表代码中的整数溢出允许本地客户机操作系统用户通过遮蔽超级页面映射造成拒绝服务（主机崩溃）或可能取得权限。 (CVE-2016-3960)

请注意，Nessus 依赖供应商报告的程序包是否存在进行判断。

x86 阴影页表：地址宽度溢出 [XSA-173、CVE-2016-3960] Qemu：net：stellaris_enet 仿真器中的缓冲区溢出 [CVE-2016-4001] Qemu：net：MIPSnet 仿真器中的缓冲区溢出 [CVE-2016-4002] qemu：
使用 siTD 进程的 usb_ehci 中的无限循环漏洞 [CVE-2016-4037]

请注意，Tenable Network Security 已直接从 Fedora 安全公告中提取上述描述块。Tenable 已尝试在不引入其他问题的情况下尽可能进行了自动整理和排版。

远程 OracleVM 系统缺少处理关键安全更新所需的修补程序：有关详细信息，请参阅 Oracle VM 安全公告 OVMSA-2016-0081。

此 xen 更新修复了多个问题。修复了这些安全问题：

- CVE-2014-3672：libvirt Xen 中的 qemu 实现允许本地客户机操作系统用户通过写入 stdout 或 stderr　造成拒绝服务（主机磁盘消耗）(bsc#981264)。

- CVE-2016-3158：在 AMD64 处理器中运行时，xrstor 函数未正确处理硬件 FSW.ES 位的写入，其允许本地客户机操作系统用户通过利用待定的异常与掩码位，从其他客户机取得敏感寄存器内容信息 (bsc#973188)。

- CVE-2016-3159：在 AMD64 处理器中运行时，arch/x86/i387.c 中的 fpu_fxrstor 函数未正确处理硬件 FSW.ES 位的写入，其允许本地客户机操作系统用户通过利用待定的异常与掩码位，从其他客户机取得敏感寄存器内容信息 (bsc#973188)。

- CVE-2016-3710：VGA 模块未对视频内存的堆积访问权限正确执行边界检查，其允许本地客户机操作系统管理员通过在设置库寄存器之后更改访问模式，在主机上执行任意代码，即“黑暗之门”问题 (bsc#978164)。

- CVE-2016-3960：x86 阴影页表代码中的整数溢出允许本地客户机操作系统用户通过遮蔽超级页面映射，造成拒绝服务（主机崩溃）或可能取得权限 (bsc#974038)。

- CVE-2016-4001：将 Stellaris 以太网控制器配置为接受大型数据包时，stellaris_enet_receive 函数中的缓冲区溢出允许远程攻击者通过大型数据包，造成拒绝服务（QEMU 崩溃）(bsc#975130)。

- CVE-2016-4002：将客户机 NIC 配置为接受大型数据包时，mipsnet_receive 函数中的缓冲区溢出允许远程攻击者通过大于 1514 字节的数据包，造成拒绝服务（内存损坏与 QEMU 崩溃）或可能执行任意代码 (bsc#975138)。

- CVE-2016-4020：patch_instruction 函数未初始化 imm32 变量，其允许本地客户机操作系统管理员通过访问 Task Priority Register (TPR)，从主机堆栈内存取得敏感信息 (bsc#975907)。

- CVE-2016-4037：hw/usb/hcd-ehci.c 中的 ehci_advance_state 函数允许本地客户机操作系统管理员通过循环拆分同步传输描述符 (siTD) 列表，造成拒绝服务（无限循环与 CPU 消耗）(bsc#976111)。

- CVE-2016-4439：53C9X Fast SCSI Controller (FSC) 支持中的 esp_reg_write 函数未正确检查命令缓冲区长度，其允许本地客户机操作系统管理员通过不明矢量，造成拒绝服务（越界写入与 QEMU 进程崩溃），或可能在主机上执行任意代码 (bsc#980716)。

- CVE-2016-4441：53C9X Fast SCSI Controller (FSC) 支持中的 get_cmd 函数未正确检查 DMA 长度，其允许本地客户机操作系统管理员通过涉及 SCSI 命令的不明矢量，造成拒绝服务（越界写入与 QEMU 进程崩溃）(bsc#980724)。

- CVE-2016-4453：vmsvga_fifo_run 函数允许本地客户机操作系统管理员通过 VGA 命令造成拒绝服务（无限循环与 QEMU 进程崩溃）(bsc#982225)。

- CVE-2016-4454：vmsvga_fifo_read_raw 函数允许本地客户机操作系统管理员通过更改 FIFO 寄存器并发出可触发越界读取的 VGA 命令，取得敏感主机内存信息或造成拒绝服务（QEMU 进程崩溃）(bsc#982224)。

- CVE-2016-4952：pvsci_ring_init_msg/data 例程中的越界访问问题 (bsc#981276)。

- CVE-2016-4962：libxl 设备处理允许本地操作系统客户机系统管理员通过操控 xenstore 的客户机控制区域中的信息，造成拒绝服务（资源消耗或管理设施混淆）或取得主机操作系统权限 (bsc#979620)。

- CVE-2016-4963：libxl 设备处理允许具有驱动程序域访问权限的本地客户机操作系统用户，通过操控 xenstore 的后端目录中的信息，造成拒绝服务（管理工具混淆）(bsc#979670)。

- CVE-2016-5105：读取配置时的堆栈信息泄漏 (bsc#982024)。

- CVE-2016-5106：设置控制器属性时的越界写入 (bsc#982025)。

- CVE-2016-5107：megasas_lookup_frame() 函数中的越界读取 (bsc#982026)。

- CVE-2016-5126：iscsi_aio_ioctl 函数中基于堆的缓冲区溢出允许本地客户机操作系统用户通过特别构建的 iSCSI 异步 I/O ioctl 调用，造成拒绝服务（QEMU 进程崩溃）或可能执行任意代码 (bsc#982286)。

- CVE-2016-5238：hw/scsi/esp.c 中的 get_cmd 函数允许本地客户机操作系统管理员通过与在非 DMA 模式下从信息传输缓冲区读取相关的矢量，造成拒绝服务（越界写入与 QEMU 进程崩溃）(bsc#982960)。

- CVE-2016-5337：megasas_ctrl_get_info 函数允许本地客户机操作系统管理员通过与读取设备控制信息相关的矢量，取得敏感主机内存信息 (bsc#983973)。

- CVE-2016-5338：(1) esp_reg_read 与 (2) esp_reg_write 函数允许本地客户机操作系统管理员通过与信息传输缓冲区相关的矢量，造成拒绝服务（QEMU 进程崩溃）或在主机上执行任意代码 (bsc#983984)。

- CVE-2016-6258：PV 客户机中潜在的权限升级 (XSA-182) (bsc#988675)。

- bsc#978295：x86 软件客户机页面 walk PS 位处理缺陷 (XSA-176)

- CVE-2016-5403：virtio：通过客户机在主机上造成的不受限制的内存分配问题导致 DoS (XSA-184) (bsc#990923)

- CVE-2016-6351：scsi：esp：esp_do_dma 中的越界写入访问 (bsc#990843) 已修复以下非安全问题：

- bsc#954872：脚本 block-dmmd 未按预期运行 - libxl：错误：libxl_dm.c

- bsc#957986：间接描述符与 Amazon 区块后端不兼容

- bsc#958848：/usr/src/packages/BUILD/xen-4.4.2-testing/obj/default/ba lloon/balloon.c:407 的 HVM 客户机崩溃

- bsc#961600：使用大于当前内存的最大内存配置 Xen HVM domU 时性能不佳

- bsc#963161：升级到最新维护更新之后，将 VF 指派给 Windows VM 时，Windows VM 会在加载期间卡住

- bsc#964427：丢弃设备区块：失败 - 输入/输出错误

- bsc#976058：运行简单 HVM 客户机时发生 Xen 错误 (Post Alpha 2 xen+qemu)

- bsc#982695：qemu 无法从 xvda 引导 HVM 客户机

- bsc#986586：“modprobe xenblk”（非 xen 内核）引导期间发生内存不足 (oom)

- bsc#967630：xend 的修正 XSA-153（报告内存大小中的差异）还进行了其他内存调整。

- bsc#974912：使用 xend 工具堆栈实时迁移后，性能持续下降

- bsc#979035：还原 bsc#955399/ bsc#955399 的 xm 迁移补丁

- bsc#989235：xen dom0 xm create 命令仅搜索 /etc/xen 而不是 /etc/xen/vm

- 在 AMD 上实时迁移 SLES 11 SP3 至 SP4：“xc：错误：
无法设置扩展的 vcpu0 信息”

- bsc#985503：修复 vif-route

- bsc#978413：PV 客户机从 SLES11 SP4 升级到 SLES 12 SP2 alpha3 失败

请注意，Tenable Network Security 已直接从 SUSE 安全公告中提取上述描述块。Tenable 已尝试在不引入其他问题的情况下尽可能进行了自动整理和排版。

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
91934	FreeBSD : xen-kernel -- x86 shadow pagetables: address width overflow (d51ced72-4212-11e6-942d-bc5ff45d0f28)	Nessus	FreeBSD Local Security Checks	2016/7/5	2021/1/4	high
219591	Linux Distros Unpatched Vulnerability : CVE-2016-3960	Nessus	Misc.	2025/3/4	2025/3/4	high
90811	Fedora 23 : xen-4.5.3-2.fc23 (2016-35d7b09908)	Nessus	Fedora Local Security Checks	2016/5/2	2021/1/11	critical
91756	OracleVM 3.2 : xen (OVMSA-2016-0081)	Nessus	OracleVM Local Security Checks	2016/6/22	2021/1/4	high
93298	SUSE SLES11 Security Update : xen (SUSE-SU-2016:2100-1) (Bunker Buster)	Nessus	SuSE Local Security Checks	2016/9/2	2021/1/19	critical
93999	openSUSE Security Update : xen (openSUSE-2016-1169) (Bunker Buster)	Nessus	SuSE Local Security Checks	2016/10/12	2021/1/19	critical
94267	SUSE SLES11 Security Update : xen (SUSE-SU-2016:2528-1) (Bunker Buster)	Nessus	SuSE Local Security Checks	2016/10/26	2021/1/19	critical
91934	FreeBSD：xen-kernel -- x86 阴影页表：地址宽度溢出 (d51ced72-4212-11e6-942d-bc5ff45d0f28)	Nessus	FreeBSD Local Security Checks	2016/7/5	2021/1/4	high
219591	Linux Distros 未修补的漏洞: CVE-2016-3960	Nessus	Misc.	2025/3/4	2025/3/4	high
90811	Fedora 23：xen-4.5.3-2.fc23 (2016-35d7b09908)	Nessus	Fedora Local Security Checks	2016/5/2	2021/1/11	critical
91756	OracleVM 3.2：xen (OVMSA-2016-0081)	Nessus	OracleVM Local Security Checks	2016/6/22	2021/1/4	high
93298	SUSE SLES11 安全更新：xen (SUSE-SU-2016:2100-1)	Nessus	SuSE Local Security Checks	2016/9/2	2021/1/19	critical

检测

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