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                         AUSCERT Security Bulletin

                               ASB-2009.1009
                                    kvm
                                8 July 2009

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:              kvm
Operating System:     UNIX variants (UNIX, Linux, OSX)
Impact/Access:        Denial of Service -- Existing Account
Resolution:           Patch
Member content until: Friday, August  7 2009

OVERVIEW

        A vulnerability has been identified in Kernel Virtual Machine (kvm-84 
        and earlier), where a denial of service condition results from a null 
        pointer reference.	


IMPACT

        Crafting a CR3 register with an invalid value via the "KVM_SET_SREGS" 
        call can cause affected systems to crash. [1]


MITIGATION

        A source code patch has been made available to correct the issue. [1]


REFERENCES

        [1] kernel virtual machine
            http://sourceforge.net/tracker/?func=detail&atid=893831&aid=2687641&group_id=180599

AusCERT has made every effort to ensure that the information contained
in this document is accurate.  However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. AusCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.

If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

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Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours 
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
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