UBUNTU-CVE-2016-4020

    Dashboard / Vulnerabilities / UBUNTU-CVE-2016-4020

    UBUNTU-CVE-2016-4020

    Published: 14 Apr 2016Last Modified: 4 Feb 2026
    Upstream:
    CVE-2016-4020
    Aliases:
    USN-2974-1

    Summary:

    Details: The patch_instruction function in hw/i386/kvmvapic.c in QEMU does not initialize the imm32 variable, which allows local guest OS administrators to obtain sensitive information from host stack memory by accessing the Task Priority Register (TPR).

    References: https://ubuntu.com/security/CVE-2016-4020, https://lists.gnu.org/archive/html/qemu-devel/2016-04/msg01118.html, http://www.openwall.com/lists/oss-security/2016/04/13/6, https://ubuntu.com/security/notices/USN-2974-1, https://www.cve.org/CVERecord?id=CVE-2016-4020

    Affected packages

    Package

    Name: qemu

    Purl: pkg:deb/ubuntu/[email protected]+dfsg-2ubuntu1.24?arch=source&distro=trusty

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -2.0.0+dfsg-2ubuntu1.24

    Affected versions

    1.5.0+dfsg-3ubuntu5
    1.5.0+dfsg-3ubuntu6

    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
    UBUNTU-CVE-2016-4020 | CVE-DB