CVE-2021-3975

    Dashboard / Vulnerabilities / CVE-2021-3975

    CVE-2021-3975

    Published: 23 Aug 2022Last Modified: 9 Jul 2026

    Summary:

    Details: A use-after-free flaw was found in libvirt. The qemuMonitorUnregister() function in qemuProcessHandleMonitorEOF is called using multiple threads without being adequately protected by a monitor lock. This flaw could be triggered by the virConnectGetAllDomainStats API when the guest is shutting down. An unprivileged client with a read-only connection could use this flaw to perform a denial of service attack by causing the libvirt daemon to crash.

    References: https://lists.debian.org/debian-lts-announce/2024/04/msg00000.html, https://security.netapp.com/advisory/ntap-20221201-0002/, https://access.redhat.com/security/cve/CVE-2021-3975, https://bugzilla.redhat.com/show_bug.cgi?id=2024326, https://github.com/libvirt/libvirt/commit/1ac703a7d0789e46833f4013a3876c2e3af18ec7, https://ubuntu.com/security/CVE-2021-3975

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -43d78f51ddb0615b7ed498219cdcfaa8eef83f2d

    Affected versions

    v7.1.0-rc2
    v7.1.0-rc1

    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-2021-3975 | CVE-DB