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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen XEN_DOMCTL_memory_mapping Missing Preemption Bug Lets Local Guest Users Deny Service on the Host System
SecurityTracker Alert ID:  1031994
SecurityTracker URL:  http://securitytracker.com/id/1031994
CVE Reference:   CVE-2015-2752   (Links to External Site)
Date:  Mar 31 2015
Impact:   Denial of service via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 3.2.x and later
Description:   A vulnerability was reported in Xen. A local user on the guest system can cause denial of service conditions on the target host system.

A local user on the guest system can invoke the XEN_DOMCTL_memory_mapping() hypercall to perform long latency MMIO mapping operations that are not preemptible, consuming excessive physical CPU resources on the host system.

x86-based HVM guests that have a PCI device assigned to them are affected.

x86 PV domains, x86 HVM domains without pass-through devices, and ARM domains are not affected.

Konrad Rzeszutek Wilk of Oracle reported this vulnerability.

Impact:   A local user on the guest system can cause denial of service conditions on the target host system.
Solution:   The vendor has issued a fix (xsa125-4.2.patch, xsa125-4.3.patch, xsa125-4.4.patch, xsa125.patch).

The vendor's advisory is available at:

http://xenbits.xen.org/xsa/advisory-125.html

Vendor URL:  xenbits.xen.org/xsa/advisory-125.html (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Any)

Message History:   None.


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