CVE-2017-15594

An issue was discovered in Xen through 4.9.x allowing x86 SVM PV guest OS users to cause a denial of service hypervisor crash or gain privileges because IDT settings are mishandled during CPU hotplugging...

CVE-2017-15588

CVE-2017-15588 affects the Xen hypervisor. Documented as a race-condition in Xen up to 4.9.x that can cause a stale TLB entry, enabling local x86 PV guest users to execute arbitrary code on the host. Public details describe a host-wards impact via TLB/ paging-structure cache timing, with the vuln...

CVE-2017-15588

An issue was discovered in Xen through 4.9.x allowing x86 PV guest OS users to execute arbitrary code on the host OS because of a race condition that can cause a stale TLB entry...

CVE-2017-15594

CVE-2017-15594 affects the Xen hypervisor up to version 4.9.x. The root cause is mishandling of IDT settings during CPU hotplugging, allowing x86 SVM PV guest OS users to cause a hypervisor crash (DoS) or escalate privileges. Exploitation details and concrete fixes are not provided in the supplie...

CVE-2017-15593

An issue was discovered in Xen through 4.9.x allowing x86 PV guest OS users to cause a denial of service memory leak because reference counts are mishandled...

CVE-2017-15594

An issue was discovered in Xen through 4.9.x allowing x86 SVM PV guest OS users to cause a denial of service hypervisor crash or gain privileges because IDT settings are mishandled during CPU hotplugging...

Xen - Pagetable De-typing Unbounded Recursion

Xen - Pagetable De-typing Unbounded Recursion Xen allows pagetables of the same level to map each other as readonly in PV domains. This is useful if a guest wants to use the self-referential pagetable trick for easy access to pagetables by mapped virtual address. When cleaning up a pagetable afte...

Xen - Pagetable De-typing Unbounded Recursion

Xen allows pagetables of the same level to map each other as readonly in PV domains. This is useful if a guest wants to use the self-referential pagetable trick for easy access to pagetables by mapped virtual address. When cleaning up a pagetable after the last typed reference to it has been...

Xen - Unbounded Recursion in Pagetable De-typing Vulnerability

Exploit for linux platform in category dos / poc Xen allows pagetables of the same level to map each other as readonly in PV domains. This is useful if a guest wants to use the self-referential pagetable trick for easy access to pagetables by mapped virtual address. When cleaning up a pagetable...

x86: Incorrect handling of self-linear shadow mappings with translated guests

ISSUE DESCRIPTION The shadow pagetable code uses linear mappings to inspect and modify the shadow pagetables. A linear mapping which points back to itself is known as self-linear. For translated guests, the shadow linear mappings being in a separate address space are not intended to be self-linea...

page type reference leak on x86

ISSUE DESCRIPTION The page type system of Xen requires cleanup when the last reference for a given page is being dropped. In order to exclude simultaneous updates to a given page by multiple parties, pages which are updated are locked beforehand. This locking includes temporarily increasing the...

x86: Incorrect handling of IST settings during CPU hotplug

ISSUE DESCRIPTION The x86-64 architecture allows interrupts to be run on distinct stacks. The choice of stack is encoded in a field of the corresponding interrupt descriptor in the Interrupt Descriptor Table IDT. That field selects an entry from the active Task State Segment TSS. Since, on AMD...

Unlimited recursion in linear pagetable de-typing

ISSUE DESCRIPTION x86 PV guests are permitted to set up certain forms of what is often called "linear page tables", where pagetables contain references to other pagetables at the same level or higher. Certain restrictions apply in order to fit into Xen's page type handling system. An important...

[SECURITY] [DSA 3981-1] linux security update

------------------------------------------------------------------------- Debian Security Advisory DSA-3981-1 [email protected] https://www.debian.org/security/ Salvatore Bonaccorso September 20, 2017 https://www.debian.org/security/faq -...

Security update for xen (important)

This update for xen fixes several issues. These security issues were fixed: - CVE-2017-14316: Missing bound check in function allocheappages for an internal array allowed attackers using crafted hypercalls to execute arbitrary code within Xen XSA-231, bsc1056278 - CVE-2017-14318: The function...

Missing NUMA node parameter verification

ISSUE DESCRIPTION The function allocheappages allows callers to specify the first NUMA node that should be used for allocations through the memflags parameter; the node is extracted using the MEMFgetnode macro. While the function checks to see if the special constant NUMANONODE is specified, it...

insufficient grant unmapping checks for x86 PV guests

ISSUE DESCRIPTION When removing or replacing a grant mapping, the x86 PV specific path needs to make sure page table entries remain in sync with other accounting done. Although the identity of the page frame was validated correctly, neither the presence of the mapping nor page writability were...

cxenstored: Race in domain cleanup

ISSUE DESCRIPTION When shutting down a VM with a stubdomain, a race in cxenstored may cause a double-free. IMPACT The xenstored daemon may crash, resulting in a DoS of any parts of the system relying on it including domain creation / destruction, ballooning, device changes, etc. VULNERABLE SYSTEM...

Missing check for grant table

ISSUE DESCRIPTION The function gnttabcacheflush handles GNTTABOPcacheflush grant table operations. It checks to see if the calling domain is the owner of the page that is to be operated on. If it is not, the owner's grant table is checked to see if a grant mapping to the calling domain exists for...

OracleVM 3.2 : xen (OVMSA-2017-0149)

The remote OracleVM system is missing necessary patches to address critical security updates : - From e26560a4b056dad6d85ffd9ebfad9565f210a9cc Mon Sep 17 00:00:00 2001 From: Jan Beulich Date: Wed, 30 May 2012 09:22:17 +0100 Subject: PATCH gnttab: don't use domain lock for serialization Instead us...