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AA-2009.0085                  AUSCERT Advisory

                                  [Linux]
                      Linux kernel: Denial of Service
                               8 April 2009
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        AusCERT Advisory Summary
        ------------------------

Product:              kernel
Operating System:     Linux variants
Impact:               Denial of Service
Access:               Existing Account
CVE Names:            CVE-2009-1243 CVE-2009-1242
Member content until: Wednesday, May 06 2009

OVERVIEW:

       Two security concerns have been found in the Linux 2.6 kernel
       prior to 2.6.29.1.


IMPACT:

       The following issues, which could potentially lead to denial 
       of service, have been confirmed as fixed:

            Reading zero bytes from /proc/net/udp or other similar files 
            which use the same seq_file udp infrastructure panics kernel. [1]


            vmx_set_msr() does not allow i386 guests to touch EFER, but they 
            can still do so through the default: label in the switch. If 
            they set EFER_LME, they can oops the host. [1]


MITIGATION:

       It is recommended to upgrade the Linux kernel to the latest
       version.


REFERENCES:

       [1] Summary of changes from v2.6.29 to v2.6.29.1
           http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.29.1

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

===========================================================================
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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