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

Created: May 17, 2021    Updated: Sep 25, 2021
Resolved Date: Sep 8, 2021
Found In Version: 10.21.20.1
Fix Version: 10.21.20.5
Severity: Standard
Applicable for: Wind River Linux LTS 21
Component/s: Userspace

Description

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.

https://lists.nongnu.org/archive/html/qemu-devel/2021-05/msg00564.html


CREATE(Triage):(User=admin) [CVE-2021-3527|https://nvd.nist.gov/vuln/detail/CVE-2021-3527]

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