Bug 851165 (CVE-2012-3495)

Summary: CVE-2012-3495 kernel: xen: hypercall physdev_get_free_pirq vulnerability
Product: [Other] Security Response Reporter: Petr Matousek <pmatouse>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: drjones, lersek, pbonzini, security-response-team, tburke
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2019-06-10 10:59:09 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 854589    
Bug Blocks: 851204    

Description Petr Matousek 2012-08-23 11:55:46 UTC 
PHYSDEVOP_get_free_pirq does not check that its call to get_free_pirq succeeded, and if it fails will use the error code as an array index.

A malicious guest might be able to cause the host to crash, leading to a DoS, depending on the exact memory layout.  Privilege escalation is a theoretical possibility which cannot be ruled out, but is considered unlikely

Acknowledgements:

Red Hat would like to thank the Xen project for reporting this issue. Upstream acknowledges Matthew Daley as the original reporter.
Comment 3 Petr Matousek 2012-08-23 11:57:31 UTC 
Statement:

Not vulnerable.

This issue did not affect the versions of the kernel-xen package as shipped with Red Hat Enterprise Linux 5.

This issue did not affect Red Hat Enterprise Linux 6 and Red Hat Enterprise MRG as we did not have support for Xen hypervisor.
Comment 4 Petr Matousek 2012-09-05 11:43:07 UTC 
Now public via:

http://seclists.org/oss-sec/2012/q3/377
Comment 5 Petr Matousek 2012-09-05 11:44:35 UTC 
Created xen tracking bugs for this issue

Affects: fedora-all [bug 854589]
Comment 6 Fedora Update System 2012-09-17 17:59:57 UTC 
xen-4.1.3-2.fc16 has been pushed to the Fedora 16 stable repository.  If problems still persist, please make note of it in this bug report.