REDHAT-BUG-917017
First published: Fri Mar 01 2013(Updated: )
Description of the problem: If the guest specifies a IOAPIC_REG_SELECT with an invalid value and follows that with a read of the IOAPIC_REG_WINDOW KVM does not properly validate that request. ioapic_read_indirect contains an ASSERT(redir_index < IOAPIC_NUM_PINS), but the ASSERT has no effect in non-debug builds. In recent kernels this allows a guest to cause a kernel oops by reading invalid memory. In older kernels (pre-3.3) this allows a guest to read from large ranges of host memory. Acknowledgements: Red Hat would like to thank Andrew Honig of Google for reporting this issue.
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Red Hat Linux kernel | >3.3 |
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Reference Links
- https://git.kernel.org/cgit/virt/kvm/kvm.git/commit/?id=a2c118bfab8bc6b8bb213abfc35201e441693d55
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=923968
- https://rhn.redhat.com/errata/RHSA-2013-0727.html
- https://rhn.redhat.com/errata/RHSA-2013-0744.html
- https://rhn.redhat.com/errata/RHSA-2013-0746.html
- https://rhn.redhat.com/errata/RHSA-2013-0928.html
- https://rhn.redhat.com/errata/RHSA-2013-1026.html
- https://bugzilla.redhat.com/show_bug.cgi?id=917017
Frequently Asked Questions
What is the severity of REDHAT-BUG-917017?
The severity of REDHAT-BUG-917017 is considered to be high due to the potential for denial of service vulnerabilities.
How do I fix REDHAT-BUG-917017?
To fix REDHAT-BUG-917017, apply the latest patches provided by Red Hat for the affected kernel version.
What versions of the Red Hat Kernel are affected by REDHAT-BUG-917017?
REDHAT-BUG-917017 affects the Red Hat Kernel version 3.3 and above.
What components are impacted by REDHAT-BUG-917017?
REDHAT-BUG-917017 impacts the IOAPIC handling within the KVM virtualization environment.
Is there an exploit available for REDHAT-BUG-917017?
Currently, there is no publicly known exploit for REDHAT-BUG-917017, but it is advisable to mitigate the risk by applying the patches.
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