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    CVE-2021-3527

    A flaw was found in the USB redirector device (usb-redir) of QEMU. Small USB packets are combined into a single, large transfer request, to reduce the overhead and improve performance. The combined size of the bulk transfer is used to dynamically allocate a variable length array (VLA) on the stack without proper validation. Since the total size is not bounded, a malicious guest could use this flaw to influence the array length and cause the QEMU process to perform an excessive allocation on the stack, resulting in a denial of service.

    Published:Apr 30, 2021
    Last Modified:Nov 21, 2024
    EPS:May 26, 2021
    EPSS Score:0.00021
    CVSS Score:5.5

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Qemu
    Product
    Qemu
    Vendor
    Redhat
    Product
    Enterprise Linux

    Exploits

    No exploit reference

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    References

    https://bugzilla.redhat.com/show_bug.cgi?id=1955695
    https://gitlab.com/qemu-project/qemu/-/commit/05a40b172e4d691371534828078be47e7fff524c
    https://gitlab.com/qemu-project/qemu/-/commit/7ec54f9eb62b5d177e30eb8b1cad795a5f8d8986
    https://lists.debian.org/debian-lts-announce/2021/09/msg00000.html
    https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html
    https://security.gentoo.org/glsa/202208-27
    https://security.netapp.com/advisory/ntap-20210708-0008/
    https://www.openwall.com/lists/oss-security/2021/05/05/5
    https://bugzilla.redhat.com/show_bug.cgi?id=1955695
    https://gitlab.com/qemu-project/qemu/-/commit/05a40b172e4d691371534828078be47e7fff524c
    https://gitlab.com/qemu-project/qemu/-/commit/7ec54f9eb62b5d177e30eb8b1cad795a5f8d8986
    https://lists.debian.org/debian-lts-announce/2021/09/msg00000.html
    https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html
    https://security.gentoo.org/glsa/202208-27
    https://security.netapp.com/advisory/ntap-20210708-0008/
    https://www.openwall.com/lists/oss-security/2021/05/05/5

    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