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    CVE-2014-7155

    The x86_emulate function in arch/x86/x86_emulate/x86_emulate.c in Xen 4.4.x and earlier does not properly check supervisor mode permissions, which allows local HVM users to cause a denial of service (guest crash) or gain guest kernel mode privileges via vectors involving an (1) HLT, (2) LGDT, (3) LIDT, or (4) LMSW instruction.

    Published:Sep 23, 2014
    Last Modified:Apr 12, 2025
    EPS:Oct 2, 2014
    EPSS Score:0.00782
    CVSS Score:5.8

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Opensuse
    Product
    Opensuse
    Vendor
    Xen
    Product
    Xen

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-862 Missing Authorization

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-665 Exploitation of Thunderbolt Protection Flaws

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    References

    http://lists.fedoraproject.org/pipermail/package-announce/2014-October/140418.html
    http://lists.fedoraproject.org/pipermail/package-announce/2014-October/140483.html
    http://lists.opensuse.org/opensuse-security-announce/2014-10/msg00002.html
    http://lists.opensuse.org/opensuse-security-announce/2014-10/msg00003.html
    http://secunia.com/advisories/61858
    http://secunia.com/advisories/61890
    http://security.gentoo.org/glsa/glsa-201412-42.xml
    http://support.citrix.com/article/CTX200218
    http://www.debian.org/security/2014/dsa-3041
    http://www.securityfocus.com/bid/70057
    http://www.securitytracker.com/id/1030888
    http://xenbits.xen.org/xsa/advisory-105.html
    http://lists.fedoraproject.org/pipermail/package-announce/2014-October/140418.html
    http://lists.fedoraproject.org/pipermail/package-announce/2014-October/140483.html
    http://lists.opensuse.org/opensuse-security-announce/2014-10/msg00002.html
    http://lists.opensuse.org/opensuse-security-announce/2014-10/msg00003.html
    http://secunia.com/advisories/61858
    http://secunia.com/advisories/61890
    http://security.gentoo.org/glsa/glsa-201412-42.xml
    http://support.citrix.com/article/CTX200218
    http://www.debian.org/security/2014/dsa-3041
    http://www.securityfocus.com/bid/70057
    http://www.securitytracker.com/id/1030888
    http://xenbits.xen.org/xsa/advisory-105.html

    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