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    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.

    Published:Mar 31, 2015
    Last Modified:Apr 12, 2025
    EPS:Apr 1, 2015
    EPSS Score:0.00119
    CVSS Score:4.9

    Affected Products

    Vendor
    Canonical
    Product
    Ubuntu Linux
    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Xen
    Product
    Xen

    Exploits

    No exploit reference

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2026-47337 (CVSS 3.3) — Ubuntu Linux 6.8, 6.17 and 7.0 contain SAUCE patches with a possible NULL pointer dereference in the handling …
    CVE-2026-47336 (CVSS 3.3) — Ubuntu Linux 6.8 contains SAUCE patches with a possible use of an uninitialized variable in AppArmor AF_INET/A…
    CVE-2026-47335 (CVSS 5.5) — Ubuntu Linux 6.8 contains SAUCE patches with a possible NULL pointer dereference in the handling of AppArmor n…
    CVE-2026-47334 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly sleep while holding a spinlock…
    CVE-2026-47333 (CVSS 7.8) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which can potentially incorrectly compute the si…
    CVE-2026-47332 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly validate the size of an intern…
    CVE-2026-47331 (CVSS 7.8) — Ubuntu Linux 6.8 contains AppArmor SAUCE patches which fail to acquire a lock when modifying a linked list. An…
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    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
    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

    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