UBUNTU-CVE-2021-20196

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    UBUNTU-CVE-2021-20196

    Published: 26 May 2021Last Modified: 9 Jun 2026
    Upstream:
    CVE-2021-20196

    Summary:

    Details: A NULL pointer dereference flaw was found in the floppy disk emulator of QEMU. This issue occurs while processing read/write ioport commands if the selected floppy drive is not initialized with a block device. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

    References: https://ubuntu.com/security/CVE-2021-20196, https://lists.nongnu.org/archive/html/qemu-devel/2021-01/msg05986.html, https://www.openwall.com/lists/oss-security/2021/01/28/1, https://ubuntu.com/security/notices/USN-5307-1, https://www.cve.org/CVERecord?id=CVE-2021-20196, https://ubuntu.com/security/notices/USN-8412-1

    Affected packages

    Package

    Name: qemu

    Purl: pkg:deb/ubuntu/qemu?arch=source&distro=esm-infra-legacy%2Ftrusty

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -2.0.0+dfsg-2ubuntu1.47+esm6

    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-2021-20196 | CVE-DB