MitreCVELIST:CVE-2015-2756CVE-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.
References
lists.fedoraproject.org/pipermail/package-announce/2015-April/154574.html
lists.fedoraproject.org/pipermail/package-announce/2015-April/154579.html
lists.fedoraproject.org/pipermail/package-announce/2015-April/155198.html
lists.nongnu.org/archive/html/qemu-devel/2015-03/msg06179.html
lists.opensuse.org/opensuse-security-announce/2015-04/msg00014.html
support.citrix.com/article/CTX201145
www.debian.org/security/2015/dsa-3259
www.securityfocus.com/bid/72577
www.securitytracker.com/id/1031998
www.ubuntu.com/usn/USN-2608-1
xenbits.xen.org/xsa/advisory-126.html
security.gentoo.org/glsa/201504-04
support.citrix.com/article/CTX206006
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