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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen ARM Multicall Processing Bug Lets Local Users on a Guest System Cause Denial of Service Conditions on the Host System
SecurityTracker Alert ID:  1034031
SecurityTracker URL:  http://securitytracker.com/id/1034031
CVE Reference:   CVE-2015-7812   (Links to External Site)
Date:  Oct 30 2015
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.4.x, 4.5.x, 4.6.x
Description:   A vulnerability was reported in Xen. A local user on the guest system can cause denial of service conditions on the host system.

A local user on the guest system can issue a preemptable hypercall via the multicall interface to trigger a flaw in the handling of multicalls and cause the target host system to crash.

32-bit and 64-bit ARM systems are affected.

x86 systems are not affected.

Julien Grall of Citrix reported this vulnerability.

Impact:   A local user on the guest system can cause denial of service conditions on the host system.
Solution:   The vendor has issued a fix (xsa145.patch).

The vendor's advisory is available at:

http://xenbits.xen.org/xsa/advisory-145.html

Vendor URL:  xenbits.xen.org/xsa/advisory-145.html (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any)

Message History:   None.


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