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Allocation of Resources Without Limits or Throttling Affecting qemu package, versions <1:5.2+dfsg-11

0.0
medium

Snyk CVSS

    Attack Complexity Low
    Availability High

    Threat Intelligence

    EPSS 0.05% (14th percentile)
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NVD
5.5 medium
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SUSE
3.8 low
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Red Hat
3.2 low

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  • Snyk ID SNYK-DEBIAN12-QEMU-1558365
  • published 4 May 2021
  • disclosed 26 May 2021
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Introduced: 4 May 2021

CVE-2021-3527 Open this link in a new tab
CWE-770 Open this link in a new tab

How to fix?

Upgrade Debian:12 qemu to version 1:5.2+dfsg-11 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream qemu package and not the qemu package as distributed by Debian. See How to fix? for Debian:12 relevant fixed versions and status.

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.