CVE-2021-3527 log

Source
Severity Low
Remote No
Type Denial of service
Description
A security issue 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.
Group Package Affected Fixed Severity Status Ticket
AVG-1898 qemu 6.0.0-3 Medium Vulnerable
References
https://bugzilla.redhat.com/show_bug.cgi?id=1955695
https://www.openwall.com/lists/oss-security/2021/05/07/1
https://gitlab.com/qemu-project/qemu/-/commit/7ec54f9eb62b5d177e30eb8b1cad795a5f8d8986
https://gitlab.com/qemu-project/qemu/-/commit/05a40b172e4d691371534828078be47e7fff524c