CVE-2015-2756

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    CVE-2015-2756

    Published: 1 Apr 2015Last Modified: 16 Apr 2026

    Summary:

    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.

    References: http://www.debian.org/security/2015/dsa-3259, http://www.ubuntu.com/usn/USN-2608-1, http://xenbits.xen.org/xsa/advisory-126.html, https://security.gentoo.org/glsa/201504-04, 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.securityfocus.com/bid/72577, http://www.securitytracker.com/id/1031998, https://support.citrix.com/article/CTX206006

    Affected packages

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2015-2756 | CVE-DB