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CVE-2021-3527 Details

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:5.5 MEDIUMVector:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URLSource(s)Tag(s)
https://bugzilla.redhat.com/show_bug.cgi?id=1955695 CVEIssue TrackingPatchThird Party Advisory
https://gitlab.com/qemu-project/qemu/-/commit/05a40b172e4d691371534828078be47e7fff524c CVEPatchThird Party Advisory
https://gitlab.com/qemu-project/qemu/-/commit/7ec54f9eb62b5d177e30eb8b1cad795a5f8d8986 CVEPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/09/msg00000.html CVEMailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html CVEMailing ListThird Party Advisory

see all 16 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-770Allocation of Resources Without Limits or Throttling[email protected]
CWE-770Allocation of Resources Without Limits or Throttling[email protected]

Affected Products

ProductVersions
qemu qemu
<= 6.0.0

CPE

  • cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.
redhat enterprise linux
8.0

CPE

  • cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:-:*:*:*
  • cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:advanced_virtualization:*:*:*

Remediation

  • No remediation found in references.
debian debian linux
9.0
10.0

CPE

  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
  • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

11 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2021-3527
NVD Published Date:
May 26, 2021
NVD Last Modified:
Jun 17, 2026
Source:
[email protected]
CVE-2021-3527 Details - Not Deferred