CVE-2015-2756
First published: Wed Apr 01 2015(Updated: )
QEMU, as used in Xen 3.3.x through 4.5.x, does not properly restrict access to PCI command registers, which might allow local HVM guest users to cause a denial of service (non-maskable interrupt and host crash) by disabling the (1) memory or (2) I/O decoding for a PCI Express device and then accessing the device, which triggers an Unsupported Request (UR) response.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Debian | =7.0 | |
| Debian | =8.0 | |
| Xen XAPI | =4.3.0 | |
| Xen XAPI | =4.3.1 | |
| Xen XAPI | =4.3.2 | |
| Xen XAPI | =4.4.0 | |
| Xen XAPI | =4.4.1 | |
| Xen XAPI | =4.5.0 | |
| Fedora | =20 | |
| Fedora | =21 | |
| Ubuntu | =12.04 | |
| Ubuntu | =14.04 | |
| Ubuntu | =14.10 | |
| Ubuntu | =15.04 |
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Reference Links
- http://lists.fedoraproject.org/pipermail/package-announce/2015-April/154574.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-April/154579.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-April/155198.html
- http://lists.nongnu.org/archive/html/qemu-devel/2015-03/msg06179.html
- http://lists.opensuse.org/opensuse-security-announce/2015-04/msg00014.html
- http://support.citrix.com/article/CTX201145
- http://www.debian.org/security/2015/dsa-3259
- http://www.securityfocus.com/bid/72577
- http://www.securitytracker.com/id/1031998
- http://www.ubuntu.com/usn/USN-2608-1
- http://xenbits.xen.org/xsa/advisory-126.html
- https://security.gentoo.org/glsa/201504-04
- https://support.citrix.com/article/CTX206006
Frequently Asked Questions
What is the severity of CVE-2015-2756?
CVE-2015-2756 has a moderate severity as it can lead to denial of service and potential host crashes.
How do I fix CVE-2015-2756?
To fix CVE-2015-2756, update to the latest version of QEMU or apply the security patch provided by your Linux distribution.
What software is affected by CVE-2015-2756?
CVE-2015-2756 affects QEMU versions used in Debian, Fedora, and Ubuntu among others.
Can CVE-2015-2756 be exploited remotely?
CVE-2015-2756 cannot be exploited remotely as it requires local access to the HVM guest.
What should I do if I cannot apply the patch for CVE-2015-2756?
If you cannot apply the patch for CVE-2015-2756, consider restricting guest user access or disabling the use of PCI Express devices.
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- version/xen xapi/4.3.0
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- version/xen xapi/4.4.0
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- version/xen xapi/4.5.0
- vendor/fedoraproject
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- version/fedora/20
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- canonical/ubuntu
- version/ubuntu/12.04
- version/ubuntu/14.04
- version/ubuntu/14.10
- version/ubuntu/15.04