CVE-2015-2756

Description

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

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

Details

Risk Information

CVSS v2