UBUNTU-CVE-2020-27821

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    UBUNTU-CVE-2020-27821

    Published: 8 Dec 2020Last Modified: 4 Feb 2026
    Upstream:
    CVE-2020-27821
    Aliases:
    USN-4725-1

    Summary:

    Details: A flaw was found in the memory management API of QEMU during the initialization of a memory region cache. This issue could lead to an out-of-bounds write access to the MSI-X table while performing MMIO operations. A guest user may abuse this flaw to crash the QEMU process on the host, resulting in a denial of service. This flaw affects QEMU versions prior to 5.2.0.

    References: https://ubuntu.com/security/CVE-2020-27821, https://ubuntu.com/security/notices/USN-4725-1, https://www.cve.org/CVERecord?id=CVE-2020-27821

    Affected packages

    Package

    Name: qemu

    Purl: pkg:deb/ubuntu/qemu@1:4.2-3ubuntu6.12?arch=source&distro=focal

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1:4.2-3ubuntu6.12

    Affected versions

    1:4.0+dfsg-0ubuntu9

    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-2020-27821 | CVE-DB