CVE-2015-5166: Use After Free
First published: Wed Aug 12 2015(Updated: )
Use-after-free vulnerability in QEMU in Xen 4.5.x and earlier does not completely unplug emulated block devices, which allows local HVM guest users to gain privileges by unplugging a block device twice.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Fedora | =21 | |
| Fedora | =22 | |
| Xen XAPI | <=4.5.0 | |
| Xen XAPI | =4.5.1 |
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Reference Links
- http://lists.fedoraproject.org/pipermail/package-announce/2015-September/165373.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-September/167792.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-September/167820.html
- http://www.securityfocus.com/bid/76152
- http://www.securitytracker.com/id/1033175
- http://xenbits.xen.org/xsa/advisory-139.html
Frequently Asked Questions
What is the severity of CVE-2015-5166?
CVE-2015-5166 is considered a high severity vulnerability due to its potential to allow privilege escalation for local HVM guest users.
How do I fix CVE-2015-5166?
To fix CVE-2015-5166, update to the latest version of QEMU or Xen that addresses this vulnerability.
Who is affected by CVE-2015-5166?
CVE-2015-5166 affects users of Xen versions up to and including 4.5.1 and specific Fedora versions 21 and 22.
What causes CVE-2015-5166?
CVE-2015-5166 is caused by a use-after-free error in QEMU when unplugging emulated block devices.
What are the potential consequences of exploiting CVE-2015-5166?
Exploiting CVE-2015-5166 can allow an attacker to gain elevated privileges on the host system by manipulating block device states.
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- version/fedora/21
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- version/xen xapi/4.5.1