REDHAT-BUG-1172765
First published: Wed Dec 10 2014(Updated: )
It was found that espfix funcionality (when returning to userspace with a 16 bit stack, the CPU will not restore the high word of esp for us on executing iret and thus potentially leaks kernel addresses; espfix fixes this) does not work for 32-bit KVM paravirt guests. A local unprivileged user could potentially use this flaw to leak kernel stack addresses. Proposed upstream patch: <a href="http://www.spinics.net/lists/kvm/msg111458.html">http://www.spinics.net/lists/kvm/msg111458.html</a> Acknowledgements: Red Hat would like to thank Andy Lutomirski for reporting this issue.
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Red Hat QEMU-KVM |
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Reference Links
- http://www.spinics.net/lists/kvm/msg111458.html
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1172769
- https://git.kernel.org/cgit/virt/kvm/kvm.git/commit/?h=linux-next&id=29fa6825463c97e5157284db80107d1bfac5d77b
- https://rhn.redhat.com/errata/RHSA-2016-0855.html
- https://bugzilla.redhat.com/show_bug.cgi?id=1172765
Frequently Asked Questions
What is the severity of REDHAT-BUG-1172765?
The severity of REDHAT-BUG-1172765 is considered high due to the potential for local unprivileged users to leak kernel addresses.
How do I fix REDHAT-BUG-1172765?
To mitigate REDHAT-BUG-1172765, ensure that your KVM setup is updated to the latest patch that addresses this issue.
Who is affected by REDHAT-BUG-1172765?
REDHAT-BUG-1172765 affects systems running the Red Hat KVM hypervisor with 32-bit KVM paravirt guests.
What are the implications of exploiting REDHAT-BUG-1172765?
Exploitation of REDHAT-BUG-1172765 could potentially allow a local unprivileged user to retrieve sensitive kernel memory addresses.
When was REDHAT-BUG-1172765 reported?
REDHAT-BUG-1172765 was reported as a bug in the Red Hat bug tracking system.
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