Design/Logic Flaw

The switchto function in arch/x86/kernel/process64.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...

CVE-2016-3157

The switchto function in arch/x86/kernel/process64.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...

CVE-2016-3157

The switchto function in arch/x86/kernel/process64.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...

kernel-uek security update

kernel-uek 4.1.12-32.2.3 - rebuild bumping release 4.1.12-32.2.2 - x86/iopl/64: properly context-switch IOPL on Xen PV Andy Lutomirski Orabug: 22997978 CVE-2016-3157 - fs/hugetlbfs/inode.c: fix bugs in hugetlbvmtruncatelist Mike Kravetz Orabug: 22667863...

broken AMD FPU FIP/FDP/FOP leak workaround

ISSUE DESCRIPTION There is a workaround in Xen to deal with the fact that AMD CPUs don't load the x86 registers FIP and possibly FCS, FDP and possibly FDS, and FOP from memory via XRSTOR or FXRSTOR when there is no pending unmasked exception. See XSA-52. However, this workaround does not cover al...

I/O port access privilege escalation in x86-64 Linux

ISSUE DESCRIPTION IRET and POPF do not modify EFLAGS.IOPL when executed by code at a privilege level other than zero. Since PV Xen guests run at privilege level 3 for 64-bit ones; 32-bit ones run at privilege level 1, to compensate for this the context switching of EFLAGS.IOPL requires the guest ...

kernel security update

kernel 2.6.18-409.0.0.0.1 - netfront fix ring buffer index go back led vif stop orabug 18272251 - net fix tcptrimhead James Li orabug 14512145, 19219078 - ocfs2: dlm: fix recovery hung Junxiao Bi orabug 13956772 - i386: fix MTRR code Zhenzhong Duan orabug 15862649 - oprofile x86, mm: Add...

Medium: kernel

Issue Overview: When running as a Xen 64-bit PV guest, user mode processes not supposed to be able to access I/O ports may be granted such permission, potentially resulting in one or more of in-guest privilege escalation, guest crashes Denial of Service, or in-guest information leaks. CVE-2016-31...

Fedora 23 : xen-4.5.2-7.fc23 (2016-2c15b72b01)

PV superpage functionality missing sanity checks XSA-167, CVE-2016-1570 VMX: intercept issue with INVLPG on non-canonical address XSA-168, CVE-2016-1571 Qemu: pci: NULL pointer dereference issue CVE-2015-7549 qemu: DoS by infinite loop in ehciadvancestate CVE-2015-8558 qemu: Heap-based buffer...

Fedora 22 : xen-4.5.2-7.fc22 (2016-e1784417af)

PV superpage functionality missing sanity checks XSA-167, CVE-2016-1570 VMX: intercept issue with INVLPG on non-canonical address XSA-168, CVE-2016-1571 Qemu: pci: NULL pointer dereference issue CVE-2015-7549 qemu: DoS by infinite loop in ehciadvancestate CVE-2015-8558 qemu: Heap-based buffer...

FreeBSD : xen-kernel -- PV superpage functionality missing sanity checks (7ed7c36f-ddaf-11e5-b2bd-002590263bf5)

The Xen Project reports : The PV superpage functionality lacks certain validity checks on data being passed to the hypervisor by guests. This is the case for the page identifier MFN passed to MMUEXTMARKSUPER and MMUEXTUNMARKSUPER sub-ops of the HYPERVISORmmuextop hypercall as well as for various...

Debian Security Advisory DSA 3471-1 (qemu - security update)

Several vulnerabilities were discovered in qemu, a full virtualization solution on x86 hardware. CVE-2015-7295 Jason Wang of Red Hat Inc. discovered that the Virtual Network Device support is vulnerable to denial-of-service, that could occur when receiving large packets. CVE-2015-7504 Qinghao Tan...

Security update for the Linux Kernel (important)

The Linux kernel for openSUSE Leap 42.1 was updated to the 4.1.15 stable release, and also includes security and bugfixes. Following security bugs were fixed: - CVE-2016-0728: A reference leak in keyring handling with joinsessionkeyring could lead to local attackers gain root privileges. bsc96207...

CVE-2016-1570

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 MMUEXTMARKSUPER or 2...

DEBIAN-CVE-2016-1570

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 MMUEXTMARKSUPER or 2...

CVE-2016-1570

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 MMUEXTMARKSUPER or 2...

Code injection

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 MMUEXTMARKSUPER or 2...

UBUNTU-CVE-2016-1570

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 MMUEXTMARKSUPER or 2...

CVE-2016-1570

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 MMUEXTMARKSUPER or 2...

CVE-2016-1570

CVE-2016-1570 affects Xen PV (PV superpage) in arch/x86/mm.c across Xen 3.4.0/3.4.1 and 4.1.x–4.6.x. A crafted MFN page identifier can be used by local PV guests to leak sensitive information, cause a denial of service, escalate privileges, or impact page-table updates via (1) MMUEXT_MARK_SUPER, ...