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


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.37% (29th percentile)

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  • Snyk IDSNYK-ECHOLATEST-QEMU-18321827
  • published27 Jul 2026
  • disclosed26 May 2021

Introduced: 26 May 2021

CVE-2021-3527  (opens in a new tab)
CWE-770  (opens in a new tab)

How to fix?

Upgrade Echo:latest 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 Echo. See How to fix? for Echo:latest 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.

CVSS Base Scores

version 3.1