{"id":"UBUNTU-CVE-2015-2756","details":"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.","modified":"2026-02-04T03:16:12.503585Z","published":"2015-04-01T00:00:00Z","related":["USN-2608-1"],"upstream":["CVE-2015-2756"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2015-2756"},{"type":"REPORT","url":"http://xenbits.xen.org/xsa/advisory-126.html"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-2608-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2015-2756"}],"affected":[{"package":{"name":"qemu","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/qemu@2.0.0+dfsg-2ubuntu1.11?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.0+dfsg-2ubuntu1.11"}]}],"versions":["1.5.0+dfsg-3ubuntu5","1.5.0+dfsg-3ubuntu6","1.6.0+dfsg-2ubuntu1","1.6.0+dfsg-2ubuntu2","1.6.0+dfsg-2ubuntu3","1.6.0+dfsg-2ubuntu4","1.7.0+dfsg-2ubuntu1","1.7.0+dfsg-2ubuntu2","1.7.0+dfsg-2ubuntu3","1.7.0+dfsg-2ubuntu4","1.7.0+dfsg-2ubuntu5","1.7.0+dfsg-2ubuntu7","1.7.0+dfsg-2ubuntu8","1.7.0+dfsg-2ubuntu9","1.7.0+dfsg-3ubuntu1~ppa1","1.7.0+dfsg-3ubuntu1","1.7.0+dfsg-3ubuntu2","1.7.0+dfsg-3ubuntu3","1.7.0+dfsg-3ubuntu4","1.7.0+dfsg-3ubuntu5","1.7.0+dfsg-3ubuntu6","1.7.0+dfsg-3ubuntu7","2.0.0~rc1+dfsg-0ubuntu1","2.0.0~rc1+dfsg-0ubuntu2","2.0.0~rc1+dfsg-0ubuntu3","2.0.0~rc1+dfsg-0ubuntu3.1","2.0.0+dfsg-2ubuntu1","2.0.0+dfsg-2ubuntu1.1","2.0.0+dfsg-2ubuntu1.2","2.0.0+dfsg-2ubuntu1.3","2.0.0+dfsg-2ubuntu1.5","2.0.0+dfsg-2ubuntu1.6","2.0.0+dfsg-2ubuntu1.7","2.0.0+dfsg-2ubuntu1.8","2.0.0+dfsg-2ubuntu1.9","2.0.0+dfsg-2ubuntu1.10"],"ecosystem_specific":{"binaries":[{"binary_name":"qemu","binary_version":"2.0.0+dfsg-2ubuntu1.11"},{"binary_name":"qemu-common","binary_version":"2.0.0+dfsg-2ubuntu1.11"},{"binary_name":"qemu-guest-agent","binary_version":"2.0.0+dfsg-2ubuntu1.11"},{"binary_name":"qemu-keymaps","binary_version":"2.0.0+dfsg-2ubuntu1.11"},{"binary_name":"qemu-kvm","binary_version":"2.0.0+dfsg-2ubuntu1.11"},{"binary_name":"qemu-system","binary_version":"2.0.0+dfsg-2ubuntu1.11"},{"binary_name":"qemu-system-aarch64","binary_version":"2.0.0+dfsg-2ubuntu1.11"},{"binary_name":"qemu-system-arm","binary_version":"2.0.0+dfsg-2ubuntu1.11"},{"binary_name":"qemu-system-common","binary_version":"2.0.0+dfsg-2ubuntu1.11"},{"binary_name":"qemu-system-mips","binary_version":"2.0.0+dfsg-2ubuntu1.11"},{"binary_name":"qemu-system-misc","binary_version":"2.0.0+dfsg-2ubuntu1.11"},{"binary_name":"qemu-system-ppc","binary_version":"2.0.0+dfsg-2ubuntu1.11"},{"binary_name":"qemu-system-sparc","binary_version":"2.0.0+dfsg-2ubuntu1.11"},{"binary_name":"qemu-system-x86","binary_version":"2.0.0+dfsg-2ubuntu1.11"},{"binary_name":"qemu-user","binary_version":"2.0.0+dfsg-2ubuntu1.11"},{"binary_name":"qemu-user-static","binary_version":"2.0.0+dfsg-2ubuntu1.11"},{"binary_name":"qemu-utils","binary_version":"2.0.0+dfsg-2ubuntu1.11"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2015/UBUNTU-CVE-2015-2756.json"}},{"package":{"name":"xen","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/xen@4.4.1-0ubuntu0.14.04.5?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.4.1-0ubuntu0.14.04.5"}]}],"versions":["4.3.0-1ubuntu1","4.3.0-1ubuntu2","4.3.0-1ubuntu3","4.3.0-1ubuntu4","4.3.0-1ubuntu5","4.4.0-0ubuntu3","4.4.0-0ubuntu4","4.4.0-0ubuntu5","4.4.0-0ubuntu5.1","4.4.0-0ubuntu5.2","4.4.1-0ubuntu0.14.04.1","4.4.1-0ubuntu0.14.04.2","4.4.1-0ubuntu0.14.04.3","4.4.1-0ubuntu0.14.04.4"],"ecosystem_specific":{"binaries":[{"binary_name":"libxen-4.4","binary_version":"4.4.1-0ubuntu0.14.04.5"},{"binary_name":"libxen-dev","binary_version":"4.4.1-0ubuntu0.14.04.5"},{"binary_name":"libxen-ocaml","binary_version":"4.4.1-0ubuntu0.14.04.5"},{"binary_name":"libxen-ocaml-dev","binary_version":"4.4.1-0ubuntu0.14.04.5"},{"binary_name":"libxenstore3.0","binary_version":"4.4.1-0ubuntu0.14.04.5"},{"binary_name":"xen-hypervisor-4.1-amd64","binary_version":"4.4.1-0ubuntu0.14.04.5"},{"binary_name":"xen-hypervisor-4.3-amd64","binary_version":"4.4.1-0ubuntu0.14.04.5"},{"binary_name":"xen-hypervisor-4.3-armhf","binary_version":"4.4.1-0ubuntu0.14.04.5"},{"binary_name":"xen-hypervisor-4.4-amd64","binary_version":"4.4.1-0ubuntu0.14.04.5"},{"binary_name":"xen-hypervisor-4.4-arm64","binary_version":"4.4.1-0ubuntu0.14.04.5"},{"binary_name":"xen-hypervisor-4.4-armhf","binary_version":"4.4.1-0ubuntu0.14.04.5"},{"binary_name":"xen-system-amd64","binary_version":"4.4.1-0ubuntu0.14.04.5"},{"binary_name":"xen-system-arm64","binary_version":"4.4.1-0ubuntu0.14.04.5"},{"binary_name":"xen-system-armhf","binary_version":"4.4.1-0ubuntu0.14.04.5"},{"binary_name":"xen-utils-4.4","binary_version":"4.4.1-0ubuntu0.14.04.5"},{"binary_name":"xen-utils-common","binary_version":"4.4.1-0ubuntu0.14.04.5"},{"binary_name":"xenstore-utils","binary_version":"4.4.1-0ubuntu0.14.04.5"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2015/UBUNTU-CVE-2015-2756.json"}}],"schema_version":"1.7.3","severity":[{"type":"Ubuntu","score":"low"}]}