CVE-2021-27379

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    CVE-2021-27379

    Published: 18 Feb 2021Last Modified: 15 Mar 2026

    Summary:

    Details: An issue was discovered in Xen through 4.11.x, allowing x86 Intel HVM guest OS users to achieve unintended read/write DMA access, and possibly cause a denial of service (host OS crash) or gain privileges. This occurs because a backport missed a flush, and thus IOMMU updates were not always correct. NOTE: this issue exists because of an incomplete fix for CVE-2020-15565.

    References: http://www.openwall.com/lists/oss-security/2021/02/23/1, https://www.debian.org/security/2021/dsa-4888, http://xenbits.xen.org/xsa/advisory-366.html, https://xenbits.xen.org/xsa/advisory-366.html

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: N/A

    Events:

    Introduced- None
    Fixed -None

    Affected versions

    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
    CVE-2021-27379 | CVE-DB