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.
History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published: 2021-05-26T21:13:56

Updated: 2024-08-03T17:01:07.589Z

Reserved: 2021-04-30T00:00:00

Link: CVE-2021-3527

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Analyzed

Published: 2021-05-26T22:15:08.267

Modified: 2022-09-30T15:10:31.600

Link: CVE-2021-3527

cve-icon Redhat

Severity : Low

Publid Date: 2021-04-30T00:00:00Z

Links: CVE-2021-3527 - Bugzilla