CVE-2015-2756
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.
| Software | From | Fixed in |
|---|---|---|
| debian / debian_linux | 8.0 | 8.0.x |
| debian / debian_linux | 7.0 | 7.0.x |
| xen / xen | 4.3.2 | 4.3.2.x |
| xen / xen | 4.3.0 | 4.3.0.x |
| xen / xen | 4.4.1 | 4.4.1.x |
| xen / xen | 4.3.1 | 4.3.1.x |
| xen / xen | 4.5.0 | 4.5.0.x |
| xen / xen | 4.4.0 | 4.4.0.x |
| fedoraproject / fedora | 20 | 20.x |
| fedoraproject / fedora | 21 | 21.x |
| canonical / ubuntu_linux | 12.04 | 12.04.x |
| canonical / ubuntu_linux | 14.10 | 14.10.x |
| canonical / ubuntu_linux | 14.04 | 14.04.x |
| canonical / ubuntu_linux | 15.04 | 15.04.x |
- 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
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