CVE-2021-20257

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    CVE-2021-20257

    Published: 16 Mar 2022Last Modified: 9 Jul 2026

    Summary:

    Details: An infinite loop flaw was found in the e1000 NIC emulator of the QEMU. This issue occurs while processing transmits (tx) descriptors in process_tx_desc if various descriptor fields are initialized with invalid values. This flaw allows a guest to consume CPU cycles on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

    References: https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html, https://security.gentoo.org/glsa/202208-27, https://security.netapp.com/advisory/ntap-20220425-0003/, https://bugzilla.redhat.com/show_bug.cgi?id=1930087, https://github.com/qemu/qemu/commit/3de46e6fc489c52c9431a8a832ad8170a7569bd8, https://lists.gnu.org/archive/html/qemu-devel/2021-02/msg07428.html, https://www.openwall.com/lists/oss-security/2021/02/25/2

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -44f28df24767cf9dca1ddc9b23157737c4cbb645

    Affected versions

    v6.2.0-rc4
    v6.2.0-rc3
    v6.2.0-rc1
    v6.2.0-rc0

    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