CVE-2016-1570

xen: PV superpage functionality missing sanity checks

The PV superpage functionality in arch/x86/mm.c in Xen 3.4.0, 3.4.1, and 4.1.x through 4.6.x allows local PV guests to obtain sensitive information, cause a denial of service, gain privileges, or have unspecified other impact via a crafted page identifier (MFN) to the (1) MMUEXT_MARK_SUPER or (2) MMUEXT_UNMARK_SUPER sub-op in the HYPERVISOR_mmuext_op hypercall or (3) unknown vectors related to page table updates.

CVSS 3.0 · 8.5 High EPSS 1.2% KEV · Not listed

Vendors

Xen

Products

Xen

CVE-2016-1571

xen: Intercept issue with INVLPG on non-canonical address causing host to crash

The paging_invlpg function in include/asm-x86/paging.h in Xen 3.3.x through 4.6.x, when using shadow mode paging or nested virtualization is enabled, allows local HVM guest users to cause a denial of service (host crash) via a non-canonical guest address in an INVVPID instruction, which triggers a hypervisor bug check.

CVSS 3.0 · 6.3 Medium EPSS 1.3% KEV · Not listed

Vendors

Citrix Xen

Products

Xenserver Xen

CVE-2016-2270

xen: inconsistent cachability flags on guest mappings (XSA-154)

Xen 4.6.x and earlier allows local guest administrators to cause a denial of service (host reboot) via vectors related to multiple mappings of MMIO pages with different cachability settings.

CVSS 3.0 · 6.8 Medium EPSS 1.5% KEV · Not listed

Vendors

Debian Fedoraproject Oracle and 1 more

Products

Debian Linux Fedora Vm Server and 1 more

CVE-2016-2271

xen: guest user mode may crash guest with non-canonical RIP (XSA-170)

VMX in Xen 4.6.x and earlier, when using an Intel or Cyrix CPU, allows local HVM guest users to cause a denial of service (guest crash) via vectors related to a non-canonical RIP.

CVSS 3.0 · 5.5 Medium EPSS < 1% KEV · Not listed

Vendors

Xen

Products

Xen

CVE-2016-3157

kernel: xen: Privilege escalation on 64-bit Xen PV domains with IO port access privileges (XSA-171)

The __switch_to function in arch/x86/kernel/process_64.c in the Linux kernel does not properly context-switch IOPL on 64-bit PV Xen guests, which allows local guest OS users to gain privileges, cause a denial of service (guest OS crash), or obtain sensitive information by leveraging I/O port access.

CVSS 3.0 · 7.8 High EPSS < 1% KEV · Not listed

Vendors

Canonical Xen

Products

Ubuntu Linux Xen

CVE-2016-3158

xen: AMD FPU FIP/FDP/FOP leak workaround broken (XSA-172)

The xrstor function in arch/x86/xstate.c in Xen 4.x does not properly handle writes to the hardware FSW.ES bit when running on AMD64 processors, which allows local guest OS users to obtain sensitive register content information from another guest by leveraging pending exception and mask bits. NOTE: this vulnerability exists because of an incorrect fix for CVE-2013-2076.

CVSS 3.0 · 3.8 Low EPSS < 1% KEV · Not listed

Vendors

Fedoraproject Oracle Xen

Products

Fedora Vm Server Xen

CVE-2016-3159

xen: AMD FPU FIP/FDP/FOP leak workaround broken (XSA-172)

The fpu_fxrstor function in arch/x86/i387.c in Xen 4.x does not properly handle writes to the hardware FSW.ES bit when running on AMD64 processors, which allows local guest OS users to obtain sensitive register content information from another guest by leveraging pending exception and mask bits. NOTE: this vulnerability exists because of an incorrect fix for CVE-2013-2076.

CVSS 3.0 · 3.8 Low EPSS < 1% KEV · Not listed

Vendors

Debian Fedoraproject Oracle and 1 more

Products

Debian Linux Fedora Vm Server and 1 more

CVE-2016-3960

xen: x86 shadow pagetables: address width overflow (XSA-173)

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.

CVSS 3.0 · 8.8 High EPSS < 1% KEV · Not listed

Vendors

Fedoraproject Oracle Xen

Products

Fedora Vm Server Xen

CVE-2016-3961

xen: hugetlbfs use may crash PV Linux guests (XSA-174)

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.

CVSS 3.0 · 5.5 Medium EPSS < 1% KEV · Not listed

Vendors

Canonical Xen

Products

Ubuntu Linux Xen

CVE-2016-4480

xen: x86 software guest page walk PS bit handling flaw (XSA-176)

The guest_walk_tables function in arch/x86/mm/guest_walk.c in Xen 4.6.x and earlier does not properly handle the Page Size (PS) page table entry bit at the L4 and L3 page table levels, which might allow local guest OS users to gain privileges via a crafted mapping of memory.

CVSS 3.0 · 8.4 High EPSS < 1% KEV · Not listed

Vendors

Oracle Xen

Products

Vm Server Xen

CVE-2016-4962

xen: Unsanitised guest input in libxl device handling code (XSA-175)

The libxl device-handling in Xen 4.6.x and earlier allows 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.

CVSS 3.0 · 6.7 Medium EPSS < 1% KEV · Not listed

Vendors

Oracle Xen

Products

Vm Server Xen

CVE-2016-4963

xen: Unsanitised driver domain input in libxl device handling (XSA-178)

The libxl device-handling in Xen through 4.6.x allows 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.

CVSS 3.0 · 4.7 Medium EPSS < 1% KEV · Not listed

Vendors

Xen

Products

Xen

CVE-2016-5242

xen: arm: Host crash caused by VMID exhaustion (XSA-181)

The p2m_teardown function in arch/arm/p2m.c in Xen 4.4.x through 4.6.x allows local guest OS users with access to the driver domain to cause a denial of service (NULL pointer dereference and host OS crash) by creating concurrent domains and holding references to them, related to VMID exhaustion.

CVSS 3.0 · 5.6 Medium EPSS < 1% KEV · Not listed

Vendors

Xen

Products

Xen

CVE-2016-6258

xen: x86: Privilege escalation in PV guests (XSA-182)

The PV pagetable code in arch/x86/mm.c in Xen 4.7.x and earlier allows local 32-bit PV guest OS administrators to gain host OS privileges by leveraging fast-paths for updating pagetable entries.

CVSS 3.0 · 8.8 High EPSS < 1% KEV · Not listed

Vendors

Citrix Xen

Products

Xenserver Xen

CVE-2016-6259

xen: x86: Missing SMAP whitelisting in 32-bit exception / event delivery (XSA-183)

Xen 4.5.x through 4.7.x do not implement Supervisor Mode Access Prevention (SMAP) whitelisting in 32-bit exception and event delivery, which allows local 32-bit PV guest OS kernels to cause a denial of service (hypervisor and VM crash) by triggering a safety check.

CVSS 3.0 · 6.2 Medium EPSS < 1% KEV · Not listed

Vendors

Citrix Xen

Products

Xenserver Xen

CVE-2016-7092

xen: x86: Disallow L3 recursive pagetable for 32-bit PV guests

The get_page_from_l3e function in arch/x86/mm.c in Xen allows local 32-bit PV guest OS administrators to gain host OS privileges via vectors related to L3 recursive pagetables.

CVSS 3.0 · 8.2 High EPSS < 1% KEV · Not listed

Vendors

Xen

Products

Xen

CVE-2016-7093

xen: x86: Mishandling of instruction pointer truncation during emulation

Xen 4.5.3, 4.6.3, and 4.7.x allow local HVM guest OS administrators to overwrite hypervisor memory and consequently gain host OS privileges by leveraging mishandling of instruction pointer truncation during emulation.

CVSS 3.0 · 8.2 High EPSS < 1% KEV · Not listed

Vendors

Xen

Products

Xen

CVE-2016-7094

xen: x86 HVM: Overflow of sh_ctxt->seg_reg[]

Buffer overflow in Xen 4.7.x and earlier allows local x86 HVM guest OS administrators on guests running with shadow paging to cause a denial of service via a pagetable update.

CVSS 3.0 · 4.1 Medium EPSS < 1% KEV · Not listed

Vendors

Xen

Products

Xen

CVE-2016-7154

xen: use after free in FIFO event channel code

Use-after-free vulnerability in the FIFO event channel code in Xen 4.4.x allows 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.

CVSS 3.0 · 6.7 Medium EPSS < 1% KEV · Not listed

Vendors

Xen

Products

Xen

CVE-2016-7777

xen: CR0.TS and CR0.EM not always honored for x86 HVM guests (XSA-190)

Xen 4.7.x and earlier does not properly honor CR0.TS and CR0.EM, which allows local x86 HVM guest OS users to read or modify FPU, MMX, or XMM register state information belonging to arbitrary tasks on the guest by modifying an instruction while the hypervisor is preparing to emulate it.

CVSS 3.0 · 6.3 Medium EPSS < 1% KEV · Not listed

Vendors

Xen

Products

Xen