CVE-2021-3750

    Dashboard / Vulnerabilities / CVE-2021-3750

    CVE-2021-3750

    Published: 2 May 2022Last Modified: 8 Jul 2026

    Summary:

    Details: A DMA reentrancy issue was found in the USB EHCI controller emulation of QEMU. EHCI does not verify if the Buffer Pointer overlaps with its MMIO region when it transfers the USB packets. Crafted content may be written to the controller's registers and trigger undesirable actions (such as reset) while the device is still transferring packets. This can ultimately lead to a use-after-free issue. A malicious guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition, or potentially execute arbitrary code within the context of the QEMU process on the host. This flaw affects QEMU versions before 7.0.0.

    References: https://gitlab.com/qemu-project/qemu/-/issues/556, https://security.gentoo.org/glsa/202208-27, https://security.netapp.com/advisory/ntap-20220624-0003/, https://bugzilla.redhat.com/show_bug.cgi?id=1999073, https://gitlab.com/qemu-project/qemu/-/issues/541

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -823a3f11fb8f04c3c3cc0f95f968fef1bfc6534f

    Affected versions

    v7.0.0-rc4
    v7.0.0-rc3
    v7.0.0-rc2
    v7.0.0-rc1
    v7.0.0-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
    CVE-2021-3750 | CVE-DB