The default SCSI command filter does not accomodate commands that overlap across device classes. An privileged guest user could potentially use this flaw to write arbitrary data to a LUN that is passed-through as read-only. Acknowledgements: This issue was discovered by Paolo Bonzini of Red Hat.
The full list of overlapping commands: - READ SUBCHANNEL <-> UNMAP (destructive, but no control on written data) - GET PERFORMANCE <-> ERASE (not really a problem, no one supports ERASE anyway) - READ DISC INFORMATION <-> XPWRITE (not commonly implemented but most dangerous)
Proposed upstream patch: https://lkml.org/lkml/2013/1/24/279
This issue has been addressed in following products: Red Hat Enterprise Linux 6 Via RHSA-2013:0496 https://rhn.redhat.com/errata/RHSA-2013-0496.html
This issue has been addressed in following products: RHEV-H and Agents for RHEL-6 Via RHSA-2013:0579 https://rhn.redhat.com/errata/RHSA-2013-0579.html
This issue has been addressed in following products: MRG for RHEL-6 v.2 Via RHSA-2013:0622 https://rhn.redhat.com/errata/RHSA-2013-0622.html
This issue has been addressed in following products: Red Hat Enterprise Linux 6.2 EUS - Server Only Via RHSA-2013:0882 https://rhn.redhat.com/errata/RHSA-2013-0882.html
This issue has been addressed in following products: Red Hat Enterprise Linux 6.3 EUS - Server Only Via RHSA-2013:0928 https://rhn.redhat.com/errata/RHSA-2013-0928.html
Statement: This issue does affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 7. Due to the lack of upstream patches and the Moderate impact, we are not planning to address this issue in Red Hat Enterprise Linux 7.