Wind River Support Network


LIN1021-32 : Security Advisory - qemu - CVE-2021-3527

Created: May 17, 2021    Updated: Sep 25, 2021
Resolved Date: Sep 8, 2021
Found In Version:
Fix Version:
Severity: Standard
Applicable for: Wind River Linux LTS 21
Component/s: Userspace


A flaw was found in the USB redirection support (usb-redir) of QEMU. More specifically, usb-host and usb-redirect try to batch bulk transfers by combining many small USB packets into a single, large transfer request, to reduce the overhead and improve performance. The combined size of the bulk sending is used in usbredir_handle_bulk_data() to dynamically allocate a variable length array (VLA) on the stack. Since the total size is not bounded, a malicious guest could be able to influence the array length and cause the QEMU process to perform an excessive allocation on the stack, resulting in a denial of service.

CREATE(Triage):(User=admin) CVE-2021-3527 (


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